xref: /external/valgrind/VEX/priv/guest_amd64_toIR.c

/*--------------------------------------------------------------------*/
/*--- begin                                     guest_amd64_toIR.c ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2004-2015 OpenWorks LLP
      info (at) open-works.net

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

   The GNU General Public License is contained in the file COPYING.

   Neither the names of the U.S. Department of Energy nor the
   University of California nor the names of its contributors may be
   used to endorse or promote products derived from this software
   without prior written permission.
*/

/* Translates AMD64 code to IR. */

/* TODO:

   All Puts to CC_OP/CC_DEP1/CC_DEP2/CC_NDEP should really be checked
   to ensure a 64-bit value is being written.

   x87 FP Limitations:

   * all arithmetic done at 64 bits

   * no FP exceptions, except for handling stack over/underflow

   * FP rounding mode observed only for float->int conversions and
     int->float conversions which could lose accuracy, and for
     float-to-float rounding.  For all other operations,
     round-to-nearest is used, regardless.

   * some of the FCOM cases could do with testing -- not convinced
     that the args are the right way round.

   * FSAVE does not re-initialise the FPU; it should do

   * FINIT not only initialises the FPU environment, it also zeroes
     all the FP registers.  It should leave the registers unchanged.

    SAHF should cause eflags[1] == 1, and in fact it produces 0.  As
    per Intel docs this bit has no meaning anyway.  Since PUSHF is the
    only way to observe eflags[1], a proper fix would be to make that
    bit be set by PUSHF.

    This module uses global variables and so is not MT-safe (if that
    should ever become relevant).
*/

/* Notes re address size overrides (0x67).

   According to the AMD documentation (24594 Rev 3.09, Sept 2003,
   "AMD64 Architecture Programmer's Manual Volume 3: General-Purpose
   and System Instructions"), Section 1.2.3 ("Address-Size Override
   Prefix"):

   0x67 applies to all explicit memory references, causing the top
   32 bits of the effective address to become zero.

   0x67 has no effect on stack references (push/pop); these always
   use a 64-bit address.

   0x67 changes the interpretation of instructions which implicitly
   reference RCX/RSI/RDI, so that in fact ECX/ESI/EDI are used
   instead.  These are:

      cmp{s,sb,sw,sd,sq}
      in{s,sb,sw,sd}
      jcxz, jecxz, jrcxz
      lod{s,sb,sw,sd,sq}
      loop{,e,bz,be,z}
      mov{s,sb,sw,sd,sq}
      out{s,sb,sw,sd}
      rep{,e,ne,nz}
      sca{s,sb,sw,sd,sq}
      sto{s,sb,sw,sd,sq}
      xlat{,b} */

/* "Special" instructions.

   This instruction decoder can decode three special instructions
   which mean nothing natively (are no-ops as far as regs/mem are
   concerned) but have meaning for supporting Valgrind.  A special
   instruction is flagged by the 16-byte preamble 48C1C703 48C1C70D
   48C1C73D 48C1C733 (in the standard interpretation, that means: rolq
   $3, %rdi; rolq $13, %rdi; rolq $61, %rdi; rolq $51, %rdi).
   Following that, one of the following 3 are allowed (standard
   interpretation in parentheses):

      4887DB (xchgq %rbx,%rbx)   %RDX = client_request ( %RAX )
      4887C9 (xchgq %rcx,%rcx)   %RAX = guest_NRADDR
      4887D2 (xchgq %rdx,%rdx)   call-noredir *%RAX
      4887F6 (xchgq %rdi,%rdi)   IR injection

   Any other bytes following the 16-byte preamble are illegal and
   constitute a failure in instruction decoding.  This all assumes
   that the preamble will never occur except in specific code
   fragments designed for Valgrind to catch.

   No prefixes may precede a "Special" instruction.
*/

/* casLE (implementation of lock-prefixed insns) and rep-prefixed
   insns: the side-exit back to the start of the insn is done with
   Ijk_Boring.  This is quite wrong, it should be done with
   Ijk_NoRedir, since otherwise the side exit, which is intended to
   restart the instruction for whatever reason, could go somewhere
   entirely else.  Doing it right (with Ijk_NoRedir jumps) would make
   no-redir jumps performance critical, at least for rep-prefixed
   instructions, since all iterations thereof would involve such a
   jump.  It's not such a big deal with casLE since the side exit is
   only taken if the CAS fails, that is, the location is contended,
   which is relatively unlikely.

   Note also, the test for CAS success vs failure is done using
   Iop_CasCmp{EQ,NE}{8,16,32,64} rather than the ordinary
   Iop_Cmp{EQ,NE} equivalents.  This is so as to tell Memcheck that it
   shouldn't definedness-check these comparisons.  See
   COMMENT_ON_CasCmpEQ in memcheck/mc_translate.c for
   background/rationale.
*/

/* LOCK prefixed instructions.  These are translated using IR-level
   CAS statements (IRCAS) and are believed to preserve atomicity, even
   from the point of view of some other process racing against a
   simulated one (presumably they communicate via a shared memory
   segment).

   Handlers which are aware of LOCK prefixes are:
      dis_op2_G_E      (add, or, adc, sbb, and, sub, xor)
      dis_cmpxchg_G_E  (cmpxchg)
      dis_Grp1         (add, or, adc, sbb, and, sub, xor)
      dis_Grp3         (not, neg)
      dis_Grp4         (inc, dec)
      dis_Grp5         (inc, dec)
      dis_Grp8_Imm     (bts, btc, btr)
      dis_bt_G_E       (bts, btc, btr)
      dis_xadd_G_E     (xadd)
*/


#include "libvex_basictypes.h"
#include "libvex_ir.h"
#include "libvex.h"
#include "libvex_guest_amd64.h"

#include "main_util.h"
#include "main_globals.h"
#include "guest_generic_bb_to_IR.h"
#include "guest_generic_x87.h"
#include "guest_amd64_defs.h"


/*------------------------------------------------------------*/
/*--- Globals                                              ---*/
/*------------------------------------------------------------*/

/* These are set at the start of the translation of an insn, right
   down in disInstr_AMD64, so that we don't have to pass them around
   endlessly.  They are all constant during the translation of any
   given insn. */

/* These are set at the start of the translation of a BB, so
   that we don't have to pass them around endlessly. */

/* We need to know this to do sub-register accesses correctly. */
static VexEndness host_endness;

/* Pointer to the guest code area (points to start of BB, not to the
   insn being processed). */
static const UChar* guest_code;

/* The guest address corresponding to guest_code[0]. */
static Addr64 guest_RIP_bbstart;

/* The guest address for the instruction currently being
   translated. */
static Addr64 guest_RIP_curr_instr;

/* The IRSB* into which we're generating code. */
static IRSB* irsb;

/* For ensuring that %rip-relative addressing is done right.  A read
   of %rip generates the address of the next instruction.  It may be
   that we don't conveniently know that inside disAMode().  For sanity
   checking, if the next insn %rip is needed, we make a guess at what
   it is, record that guess here, and set the accompanying Bool to
   indicate that -- after this insn's decode is finished -- that guess
   needs to be checked.  */

/* At the start of each insn decode, is set to (0, False).
   After the decode, if _mustcheck is now True, _assumed is
   checked. */

static Addr64 guest_RIP_next_assumed;
static Bool   guest_RIP_next_mustcheck;


/*------------------------------------------------------------*/
/*--- Helpers for constructing IR.                         ---*/
/*------------------------------------------------------------*/

/* Generate a new temporary of the given type. */
static IRTemp newTemp ( IRType ty )
{
   vassert(isPlausibleIRType(ty));
   return newIRTemp( irsb->tyenv, ty );
}

/* Add a statement to the list held by "irsb". */
static void stmt ( IRStmt* st )
{
   addStmtToIRSB( irsb, st );
}

/* Generate a statement "dst := e". */
static void assign ( IRTemp dst, IRExpr* e )
{
   stmt( IRStmt_WrTmp(dst, e) );
}

static IRExpr* unop ( IROp op, IRExpr* a )
{
   return IRExpr_Unop(op, a);
}

static IRExpr* binop ( IROp op, IRExpr* a1, IRExpr* a2 )
{
   return IRExpr_Binop(op, a1, a2);
}

static IRExpr* triop ( IROp op, IRExpr* a1, IRExpr* a2, IRExpr* a3 )
{
   return IRExpr_Triop(op, a1, a2, a3);
}

static IRExpr* mkexpr ( IRTemp tmp )
{
   return IRExpr_RdTmp(tmp);
}

static IRExpr* mkU8 ( ULong i )
{
   vassert(i < 256);
   return IRExpr_Const(IRConst_U8( (UChar)i ));
}

static IRExpr* mkU16 ( ULong i )
{
   vassert(i < 0x10000ULL);
   return IRExpr_Const(IRConst_U16( (UShort)i ));
}

static IRExpr* mkU32 ( ULong i )
{
   vassert(i < 0x100000000ULL);
   return IRExpr_Const(IRConst_U32( (UInt)i ));
}

static IRExpr* mkU64 ( ULong i )
{
   return IRExpr_Const(IRConst_U64(i));
}

static IRExpr* mkU ( IRType ty, ULong i )
{
   switch (ty) {
      case Ity_I8:  return mkU8(i);
      case Ity_I16: return mkU16(i);
      case Ity_I32: return mkU32(i);
      case Ity_I64: return mkU64(i);
      default: vpanic("mkU(amd64)");
   }
}

static void storeLE ( IRExpr* addr, IRExpr* data )
{
   stmt( IRStmt_Store(Iend_LE, addr, data) );
}

static IRExpr* loadLE ( IRType ty, IRExpr* addr )
{
   return IRExpr_Load(Iend_LE, ty, addr);
}

static IROp mkSizedOp ( IRType ty, IROp op8 )
{
   vassert(op8 == Iop_Add8 || op8 == Iop_Sub8
           || op8 == Iop_Mul8
           || op8 == Iop_Or8 || op8 == Iop_And8 || op8 == Iop_Xor8
           || op8 == Iop_Shl8 || op8 == Iop_Shr8 || op8 == Iop_Sar8
           || op8 == Iop_CmpEQ8 || op8 == Iop_CmpNE8
           || op8 == Iop_CasCmpNE8
           || op8 == Iop_Not8 );
   switch (ty) {
      case Ity_I8:  return 0 +op8;
      case Ity_I16: return 1 +op8;
      case Ity_I32: return 2 +op8;
      case Ity_I64: return 3 +op8;
      default: vpanic("mkSizedOp(amd64)");
   }
}

static
IRExpr* doScalarWidening ( Int szSmall, Int szBig, Bool signd, IRExpr* src )
{
   if (szSmall == 1 && szBig == 4) {
      return unop(signd ? Iop_8Sto32 : Iop_8Uto32, src);
   }
   if (szSmall == 1 && szBig == 2) {
      return unop(signd ? Iop_8Sto16 : Iop_8Uto16, src);
   }
   if (szSmall == 2 && szBig == 4) {
      return unop(signd ? Iop_16Sto32 : Iop_16Uto32, src);
   }
   if (szSmall == 1 && szBig == 8 && !signd) {
      return unop(Iop_8Uto64, src);
   }
   if (szSmall == 1 && szBig == 8 && signd) {
      return unop(Iop_8Sto64, src);
   }
   if (szSmall == 2 && szBig == 8 && !signd) {
      return unop(Iop_16Uto64, src);
   }
   if (szSmall == 2 && szBig == 8 && signd) {
      return unop(Iop_16Sto64, src);
   }
   vpanic("doScalarWidening(amd64)");
}

static
void putGuarded ( Int gstOffB, IRExpr* guard, IRExpr* value )
{
   IRType ty = typeOfIRExpr(irsb->tyenv, value);
   stmt( IRStmt_Put(gstOffB,
                    IRExpr_ITE(guard, value, IRExpr_Get(gstOffB, ty))) );
}


/*------------------------------------------------------------*/
/*--- Debugging output                                     ---*/
/*------------------------------------------------------------*/

/* Bomb out if we can't handle something. */
__attribute__ ((noreturn))
static void unimplemented ( const HChar* str )
{
   vex_printf("amd64toIR: unimplemented feature\n");
   vpanic(str);
}

#define DIP(format, args...)           \
   if (vex_traceflags & VEX_TRACE_FE)  \
      vex_printf(format, ## args)

#define DIS(buf, format, args...)      \
   if (vex_traceflags & VEX_TRACE_FE)  \
      vex_sprintf(buf, format, ## args)


/*------------------------------------------------------------*/
/*--- Offsets of various parts of the amd64 guest state.   ---*/
/*------------------------------------------------------------*/

#define OFFB_RAX       offsetof(VexGuestAMD64State,guest_RAX)
#define OFFB_RBX       offsetof(VexGuestAMD64State,guest_RBX)
#define OFFB_RCX       offsetof(VexGuestAMD64State,guest_RCX)
#define OFFB_RDX       offsetof(VexGuestAMD64State,guest_RDX)
#define OFFB_RSP       offsetof(VexGuestAMD64State,guest_RSP)
#define OFFB_RBP       offsetof(VexGuestAMD64State,guest_RBP)
#define OFFB_RSI       offsetof(VexGuestAMD64State,guest_RSI)
#define OFFB_RDI       offsetof(VexGuestAMD64State,guest_RDI)
#define OFFB_R8        offsetof(VexGuestAMD64State,guest_R8)
#define OFFB_R9        offsetof(VexGuestAMD64State,guest_R9)
#define OFFB_R10       offsetof(VexGuestAMD64State,guest_R10)
#define OFFB_R11       offsetof(VexGuestAMD64State,guest_R11)
#define OFFB_R12       offsetof(VexGuestAMD64State,guest_R12)
#define OFFB_R13       offsetof(VexGuestAMD64State,guest_R13)
#define OFFB_R14       offsetof(VexGuestAMD64State,guest_R14)
#define OFFB_R15       offsetof(VexGuestAMD64State,guest_R15)

#define OFFB_RIP       offsetof(VexGuestAMD64State,guest_RIP)

#define OFFB_FS_CONST  offsetof(VexGuestAMD64State,guest_FS_CONST)
#define OFFB_GS_CONST  offsetof(VexGuestAMD64State,guest_GS_CONST)

#define OFFB_CC_OP     offsetof(VexGuestAMD64State,guest_CC_OP)
#define OFFB_CC_DEP1   offsetof(VexGuestAMD64State,guest_CC_DEP1)
#define OFFB_CC_DEP2   offsetof(VexGuestAMD64State,guest_CC_DEP2)
#define OFFB_CC_NDEP   offsetof(VexGuestAMD64State,guest_CC_NDEP)

#define OFFB_FPREGS    offsetof(VexGuestAMD64State,guest_FPREG[0])
#define OFFB_FPTAGS    offsetof(VexGuestAMD64State,guest_FPTAG[0])
#define OFFB_DFLAG     offsetof(VexGuestAMD64State,guest_DFLAG)
#define OFFB_ACFLAG    offsetof(VexGuestAMD64State,guest_ACFLAG)
#define OFFB_IDFLAG    offsetof(VexGuestAMD64State,guest_IDFLAG)
#define OFFB_FTOP      offsetof(VexGuestAMD64State,guest_FTOP)
#define OFFB_FC3210    offsetof(VexGuestAMD64State,guest_FC3210)
#define OFFB_FPROUND   offsetof(VexGuestAMD64State,guest_FPROUND)

#define OFFB_SSEROUND  offsetof(VexGuestAMD64State,guest_SSEROUND)
#define OFFB_YMM0      offsetof(VexGuestAMD64State,guest_YMM0)
#define OFFB_YMM1      offsetof(VexGuestAMD64State,guest_YMM1)
#define OFFB_YMM2      offsetof(VexGuestAMD64State,guest_YMM2)
#define OFFB_YMM3      offsetof(VexGuestAMD64State,guest_YMM3)
#define OFFB_YMM4      offsetof(VexGuestAMD64State,guest_YMM4)
#define OFFB_YMM5      offsetof(VexGuestAMD64State,guest_YMM5)
#define OFFB_YMM6      offsetof(VexGuestAMD64State,guest_YMM6)
#define OFFB_YMM7      offsetof(VexGuestAMD64State,guest_YMM7)
#define OFFB_YMM8      offsetof(VexGuestAMD64State,guest_YMM8)
#define OFFB_YMM9      offsetof(VexGuestAMD64State,guest_YMM9)
#define OFFB_YMM10     offsetof(VexGuestAMD64State,guest_YMM10)
#define OFFB_YMM11     offsetof(VexGuestAMD64State,guest_YMM11)
#define OFFB_YMM12     offsetof(VexGuestAMD64State,guest_YMM12)
#define OFFB_YMM13     offsetof(VexGuestAMD64State,guest_YMM13)
#define OFFB_YMM14     offsetof(VexGuestAMD64State,guest_YMM14)
#define OFFB_YMM15     offsetof(VexGuestAMD64State,guest_YMM15)
#define OFFB_YMM16     offsetof(VexGuestAMD64State,guest_YMM16)

#define OFFB_EMNOTE    offsetof(VexGuestAMD64State,guest_EMNOTE)
#define OFFB_CMSTART   offsetof(VexGuestAMD64State,guest_CMSTART)
#define OFFB_CMLEN     offsetof(VexGuestAMD64State,guest_CMLEN)

#define OFFB_NRADDR    offsetof(VexGuestAMD64State,guest_NRADDR)


/*------------------------------------------------------------*/
/*--- Helper bits and pieces for deconstructing the        ---*/
/*--- amd64 insn stream.                                   ---*/
/*------------------------------------------------------------*/

/* This is the AMD64 register encoding -- integer regs. */
#define R_RAX 0
#define R_RCX 1
#define R_RDX 2
#define R_RBX 3
#define R_RSP 4
#define R_RBP 5
#define R_RSI 6
#define R_RDI 7
#define R_R8  8
#define R_R9  9
#define R_R10 10
#define R_R11 11
#define R_R12 12
#define R_R13 13
#define R_R14 14
#define R_R15 15

/* This is the Intel register encoding -- segment regs. */
#define R_ES 0
#define R_CS 1
#define R_SS 2
#define R_DS 3
#define R_FS 4
#define R_GS 5


/* Various simple conversions */

static ULong extend_s_8to64 ( UChar x )
{
   return (ULong)((Long)(((ULong)x) << 56) >> 56);
}

static ULong extend_s_16to64 ( UShort x )
{
   return (ULong)((Long)(((ULong)x) << 48) >> 48);
}

static ULong extend_s_32to64 ( UInt x )
{
   return (ULong)((Long)(((ULong)x) << 32) >> 32);
}

/* Figure out whether the mod and rm parts of a modRM byte refer to a
   register or memory.  If so, the byte will have the form 11XXXYYY,
   where YYY is the register number. */
inline
static Bool epartIsReg ( UChar mod_reg_rm )
{
   return toBool(0xC0 == (mod_reg_rm & 0xC0));
}

/* Extract the 'g' field from a modRM byte.  This only produces 3
   bits, which is not a complete register number.  You should avoid
   this function if at all possible. */
inline
static Int gregLO3ofRM ( UChar mod_reg_rm )
{
   return (Int)( (mod_reg_rm >> 3) & 7 );
}

/* Ditto the 'e' field of a modRM byte. */
inline
static Int eregLO3ofRM ( UChar mod_reg_rm )
{
   return (Int)(mod_reg_rm & 0x7);
}

/* Get a 8/16/32-bit unsigned value out of the insn stream. */

static inline UChar getUChar ( Long delta )
{
   UChar v = guest_code[delta+0];
   return v;
}

static UInt getUDisp16 ( Long delta )
{
   UInt v = guest_code[delta+1]; v <<= 8;
   v |= guest_code[delta+0];
   return v & 0xFFFF;
}

//.. static UInt getUDisp ( Int size, Long delta )
//.. {
//..    switch (size) {
//..       case 4: return getUDisp32(delta);
//..       case 2: return getUDisp16(delta);
//..       case 1: return getUChar(delta);
//..       default: vpanic("getUDisp(x86)");
//..    }
//..    return 0; /*notreached*/
//.. }


/* Get a byte value out of the insn stream and sign-extend to 64
   bits. */
static Long getSDisp8 ( Long delta )
{
   return extend_s_8to64( guest_code[delta] );
}

/* Get a 16-bit value out of the insn stream and sign-extend to 64
   bits. */
static Long getSDisp16 ( Long delta )
{
   UInt v = guest_code[delta+1]; v <<= 8;
   v |= guest_code[delta+0];
   return extend_s_16to64( (UShort)v );
}

/* Get a 32-bit value out of the insn stream and sign-extend to 64
   bits. */
static Long getSDisp32 ( Long delta )
{
   UInt v = guest_code[delta+3]; v <<= 8;
   v |= guest_code[delta+2]; v <<= 8;
   v |= guest_code[delta+1]; v <<= 8;
   v |= guest_code[delta+0];
   return extend_s_32to64( v );
}

/* Get a 64-bit value out of the insn stream. */
static Long getDisp64 ( Long delta )
{
   ULong v = 0;
   v |= guest_code[delta+7]; v <<= 8;
   v |= guest_code[delta+6]; v <<= 8;
   v |= guest_code[delta+5]; v <<= 8;
   v |= guest_code[delta+4]; v <<= 8;
   v |= guest_code[delta+3]; v <<= 8;
   v |= guest_code[delta+2]; v <<= 8;
   v |= guest_code[delta+1]; v <<= 8;
   v |= guest_code[delta+0];
   return v;
}

/* Note: because AMD64 doesn't allow 64-bit literals, it is an error
   if this is called with size==8.  Should not happen. */
static Long getSDisp ( Int size, Long delta )
{
   switch (size) {
      case 4: return getSDisp32(delta);
      case 2: return getSDisp16(delta);
      case 1: return getSDisp8(delta);
      default: vpanic("getSDisp(amd64)");
  }
}

static ULong mkSizeMask ( Int sz )
{
   switch (sz) {
      case 1: return 0x00000000000000FFULL;
      case 2: return 0x000000000000FFFFULL;
      case 4: return 0x00000000FFFFFFFFULL;
      case 8: return 0xFFFFFFFFFFFFFFFFULL;
      default: vpanic("mkSzMask(amd64)");
   }
}

static Int imin ( Int a, Int b )
{
   return (a < b) ? a : b;
}

static IRType szToITy ( Int n )
{
   switch (n) {
      case 1: return Ity_I8;
      case 2: return Ity_I16;
      case 4: return Ity_I32;
      case 8: return Ity_I64;
      default: vex_printf("\nszToITy(%d)\n", n);
               vpanic("szToITy(amd64)");
   }
}


/*------------------------------------------------------------*/
/*--- For dealing with prefixes.                           ---*/
/*------------------------------------------------------------*/

/* The idea is to pass around an int holding a bitmask summarising
   info from the prefixes seen on the current instruction, including
   info from the REX byte.  This info is used in various places, but
   most especially when making sense of register fields in
   instructions.

   The top 8 bits of the prefix are 0x55, just as a hacky way to
   ensure it really is a valid prefix.

   Things you can safely assume about a well-formed prefix:
   * at most one segment-override bit (CS,DS,ES,FS,GS,SS) is set.
   * if REX is not present then REXW,REXR,REXX,REXB will read
     as zero.
   * F2 and F3 will not both be 1.
*/

typedef UInt  Prefix;

#define PFX_ASO    (1<<0)    /* address-size override present (0x67) */
#define PFX_66     (1<<1)    /* operand-size override-to-16 present (0x66) */
#define PFX_REX    (1<<2)    /* REX byte present (0x40 to 0x4F) */
#define PFX_REXW   (1<<3)    /* REX W bit, if REX present, else 0 */
#define PFX_REXR   (1<<4)    /* REX R bit, if REX present, else 0 */
#define PFX_REXX   (1<<5)    /* REX X bit, if REX present, else 0 */
#define PFX_REXB   (1<<6)    /* REX B bit, if REX present, else 0 */
#define PFX_LOCK   (1<<7)    /* bus LOCK prefix present (0xF0) */
#define PFX_F2     (1<<8)    /* REP/REPE/REPZ prefix present (0xF2) */
#define PFX_F3     (1<<9)    /* REPNE/REPNZ prefix present (0xF3) */
#define PFX_CS     (1<<10)   /* CS segment prefix present (0x2E) */
#define PFX_DS     (1<<11)   /* DS segment prefix present (0x3E) */
#define PFX_ES     (1<<12)   /* ES segment prefix present (0x26) */
#define PFX_FS     (1<<13)   /* FS segment prefix present (0x64) */
#define PFX_GS     (1<<14)   /* GS segment prefix present (0x65) */
#define PFX_SS     (1<<15)   /* SS segment prefix present (0x36) */
#define PFX_VEX    (1<<16)   /* VEX prefix present (0xC4 or 0xC5) */
#define PFX_VEXL   (1<<17)   /* VEX L bit, if VEX present, else 0 */
/* The extra register field VEX.vvvv is encoded (after not-ing it) as
   PFX_VEXnV3 .. PFX_VEXnV0, so these must occupy adjacent bit
   positions. */
#define PFX_VEXnV0 (1<<18)   /* ~VEX vvvv[0], if VEX present, else 0 */
#define PFX_VEXnV1 (1<<19)   /* ~VEX vvvv[1], if VEX present, else 0 */
#define PFX_VEXnV2 (1<<20)   /* ~VEX vvvv[2], if VEX present, else 0 */
#define PFX_VEXnV3 (1<<21)   /* ~VEX vvvv[3], if VEX present, else 0 */


#define PFX_EMPTY 0x55000000

static Bool IS_VALID_PFX ( Prefix pfx ) {
   return toBool((pfx & 0xFF000000) == PFX_EMPTY);
}

static Bool haveREX ( Prefix pfx ) {
   return toBool(pfx & PFX_REX);
}

static Int getRexW ( Prefix pfx ) {
   return (pfx & PFX_REXW) ? 1 : 0;
}
static Int getRexR ( Prefix pfx ) {
   return (pfx & PFX_REXR) ? 1 : 0;
}
static Int getRexX ( Prefix pfx ) {
   return (pfx & PFX_REXX) ? 1 : 0;
}
static Int getRexB ( Prefix pfx ) {
   return (pfx & PFX_REXB) ? 1 : 0;
}

/* Check a prefix doesn't have F2 or F3 set in it, since usually that
   completely changes what instruction it really is. */
static Bool haveF2orF3 ( Prefix pfx ) {
   return toBool((pfx & (PFX_F2|PFX_F3)) > 0);
}
static Bool haveF2andF3 ( Prefix pfx ) {
   return toBool((pfx & (PFX_F2|PFX_F3)) == (PFX_F2|PFX_F3));
}
static Bool haveF2 ( Prefix pfx ) {
   return toBool((pfx & PFX_F2) > 0);
}
static Bool haveF3 ( Prefix pfx ) {
   return toBool((pfx & PFX_F3) > 0);
}

static Bool have66 ( Prefix pfx ) {
   return toBool((pfx & PFX_66) > 0);
}
static Bool haveASO ( Prefix pfx ) {
   return toBool((pfx & PFX_ASO) > 0);
}
static Bool haveLOCK ( Prefix pfx ) {
   return toBool((pfx & PFX_LOCK) > 0);
}

/* Return True iff pfx has 66 set and F2 and F3 clear */
static Bool have66noF2noF3 ( Prefix pfx )
{
  return
     toBool((pfx & (PFX_66|PFX_F2|PFX_F3)) == PFX_66);
}

/* Return True iff pfx has F2 set and 66 and F3 clear */
static Bool haveF2no66noF3 ( Prefix pfx )
{
  return
     toBool((pfx & (PFX_66|PFX_F2|PFX_F3)) == PFX_F2);
}

/* Return True iff pfx has F3 set and 66 and F2 clear */
static Bool haveF3no66noF2 ( Prefix pfx )
{
  return
     toBool((pfx & (PFX_66|PFX_F2|PFX_F3)) == PFX_F3);
}

/* Return True iff pfx has F3 set and F2 clear */
static Bool haveF3noF2 ( Prefix pfx )
{
  return
     toBool((pfx & (PFX_F2|PFX_F3)) == PFX_F3);
}

/* Return True iff pfx has F2 set and F3 clear */
static Bool haveF2noF3 ( Prefix pfx )
{
  return
     toBool((pfx & (PFX_F2|PFX_F3)) == PFX_F2);
}

/* Return True iff pfx has 66, F2 and F3 clear */
static Bool haveNo66noF2noF3 ( Prefix pfx )
{
  return
     toBool((pfx & (PFX_66|PFX_F2|PFX_F3)) == 0);
}

/* Return True iff pfx has any of 66, F2 and F3 set */
static Bool have66orF2orF3 ( Prefix pfx )
{
  return toBool( ! haveNo66noF2noF3(pfx) );
}

/* Return True iff pfx has 66 or F3 set */
static Bool have66orF3 ( Prefix pfx )
{
   return toBool((pfx & (PFX_66|PFX_F3)) > 0);
}

/* Clear all the segment-override bits in a prefix. */
static Prefix clearSegBits ( Prefix p )
{
   return
      p & ~(PFX_CS | PFX_DS | PFX_ES | PFX_FS | PFX_GS | PFX_SS);
}

/* Get the (inverted, hence back to "normal") VEX.vvvv field. */
static UInt getVexNvvvv ( Prefix pfx ) {
   UInt r = (UInt)pfx;
   r /= (UInt)PFX_VEXnV0; /* pray this turns into a shift */
   return r & 0xF;
}

static Bool haveVEX ( Prefix pfx ) {
   return toBool(pfx & PFX_VEX);
}

static Int getVexL ( Prefix pfx ) {
   return (pfx & PFX_VEXL) ? 1 : 0;
}


/*------------------------------------------------------------*/
/*--- For dealing with escapes                             ---*/
/*------------------------------------------------------------*/


/* Escapes come after the prefixes, but before the primary opcode
   byte.  They escape the primary opcode byte into a bigger space.
   The 0xF0000000 isn't significant, except so as to make it not
   overlap valid Prefix values, for sanity checking.
*/

typedef
   enum {
      ESC_NONE=0xF0000000, // none
      ESC_0F,              // 0F
      ESC_0F38,            // 0F 38
      ESC_0F3A             // 0F 3A
   }
   Escape;


/*------------------------------------------------------------*/
/*--- For dealing with integer registers                   ---*/
/*------------------------------------------------------------*/

/* This is somewhat complex.  The rules are:

   For 64, 32 and 16 bit register references, the e or g fields in the
   modrm bytes supply the low 3 bits of the register number.  The
   fourth (most-significant) bit of the register number is supplied by
   the REX byte, if it is present; else that bit is taken to be zero.

   The REX.R bit supplies the high bit corresponding to the g register
   field, and the REX.B bit supplies the high bit corresponding to the
   e register field (when the mod part of modrm indicates that modrm's
   e component refers to a register and not to memory).

   The REX.X bit supplies a high register bit for certain registers
   in SIB address modes, and is generally rarely used.

   For 8 bit register references, the presence of the REX byte itself
   has significance.  If there is no REX present, then the 3-bit
   number extracted from the modrm e or g field is treated as an index
   into the sequence %al %cl %dl %bl %ah %ch %dh %bh -- that is, the
   old x86 encoding scheme.

   But if there is a REX present, the register reference is
   interpreted in the same way as for 64/32/16-bit references: a high
   bit is extracted from REX, giving a 4-bit number, and the denoted
   register is the lowest 8 bits of the 16 integer registers denoted
   by the number.  In particular, values 3 through 7 of this sequence
   do not refer to %ah %ch %dh %bh but instead to the lowest 8 bits of
   %rsp %rbp %rsi %rdi.

   The REX.W bit has no bearing at all on register numbers.  Instead
   its presence indicates that the operand size is to be overridden
   from its default value (32 bits) to 64 bits instead.  This is in
   the same fashion that an 0x66 prefix indicates the operand size is
   to be overridden from 32 bits down to 16 bits.  When both REX.W and
   0x66 are present there is a conflict, and REX.W takes precedence.

   Rather than try to handle this complexity using a single huge
   function, several smaller ones are provided.  The aim is to make it
   as difficult as possible to screw up register decoding in a subtle
   and hard-to-track-down way.

   Because these routines fish around in the host's memory (that is,
   in the guest state area) for sub-parts of guest registers, their
   correctness depends on the host's endianness.  So far these
   routines only work for little-endian hosts.  Those for which
   endianness is important have assertions to ensure sanity.
*/


/* About the simplest question you can ask: where do the 64-bit
   integer registers live (in the guest state) ? */

static Int integerGuestReg64Offset ( UInt reg )
{
   switch (reg) {
      case R_RAX: return OFFB_RAX;
      case R_RCX: return OFFB_RCX;
      case R_RDX: return OFFB_RDX;
      case R_RBX: return OFFB_RBX;
      case R_RSP: return OFFB_RSP;
      case R_RBP: return OFFB_RBP;
      case R_RSI: return OFFB_RSI;
      case R_RDI: return OFFB_RDI;
      case R_R8:  return OFFB_R8;
      case R_R9:  return OFFB_R9;
      case R_R10: return OFFB_R10;
      case R_R11: return OFFB_R11;
      case R_R12: return OFFB_R12;
      case R_R13: return OFFB_R13;
      case R_R14: return OFFB_R14;
      case R_R15: return OFFB_R15;
      default: vpanic("integerGuestReg64Offset(amd64)");
   }
}


/* Produce the name of an integer register, for printing purposes.
   reg is a number in the range 0 .. 15 that has been generated from a
   3-bit reg-field number and a REX extension bit.  irregular denotes
   the case where sz==1 and no REX byte is present. */

static
const HChar* nameIReg ( Int sz, UInt reg, Bool irregular )
{
   static const HChar* ireg64_names[16]
     = { "%rax", "%rcx", "%rdx", "%rbx", "%rsp", "%rbp", "%rsi", "%rdi",
         "%r8",  "%r9",  "%r10", "%r11", "%r12", "%r13", "%r14", "%r15" };
   static const HChar* ireg32_names[16]
     = { "%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi",
         "%r8d", "%r9d", "%r10d","%r11d","%r12d","%r13d","%r14d","%r15d" };
   static const HChar* ireg16_names[16]
     = { "%ax",  "%cx",  "%dx",  "%bx",  "%sp",  "%bp",  "%si",  "%di",
         "%r8w", "%r9w", "%r10w","%r11w","%r12w","%r13w","%r14w","%r15w" };
   static const HChar* ireg8_names[16]
     = { "%al",  "%cl",  "%dl",  "%bl",  "%spl", "%bpl", "%sil", "%dil",
         "%r8b", "%r9b", "%r10b","%r11b","%r12b","%r13b","%r14b","%r15b" };
   static const HChar* ireg8_irregular[8]
     = { "%al", "%cl", "%dl", "%bl", "%ah", "%ch", "%dh", "%bh" };

   vassert(reg < 16);
   if (sz == 1) {
      if (irregular)
         vassert(reg < 8);
   } else {
      vassert(irregular == False);
   }

   switch (sz) {
      case 8: return ireg64_names[reg];
      case 4: return ireg32_names[reg];
      case 2: return ireg16_names[reg];
      case 1: if (irregular) {
                 return ireg8_irregular[reg];
              } else {
                 return ireg8_names[reg];
              }
      default: vpanic("nameIReg(amd64)");
   }
}

/* Using the same argument conventions as nameIReg, produce the
   guest state offset of an integer register. */

static
Int offsetIReg ( Int sz, UInt reg, Bool irregular )
{
   vassert(reg < 16);
   if (sz == 1) {
      if (irregular)
         vassert(reg < 8);
   } else {
      vassert(irregular == False);
   }

   /* Deal with irregular case -- sz==1 and no REX present */
   if (sz == 1 && irregular) {
      switch (reg) {
         case R_RSP: return 1+ OFFB_RAX;
         case R_RBP: return 1+ OFFB_RCX;
         case R_RSI: return 1+ OFFB_RDX;
         case R_RDI: return 1+ OFFB_RBX;
         default:    break; /* use the normal case */
      }
   }

   /* Normal case */
   return integerGuestReg64Offset(reg);
}


/* Read the %CL register :: Ity_I8, for shift/rotate operations. */

static IRExpr* getIRegCL ( void )
{
   vassert(host_endness == VexEndnessLE);
   return IRExpr_Get( OFFB_RCX, Ity_I8 );
}


/* Write to the %AH register. */

static void putIRegAH ( IRExpr* e )
{
   vassert(host_endness == VexEndnessLE);
   vassert(typeOfIRExpr(irsb->tyenv, e) == Ity_I8);
   stmt( IRStmt_Put( OFFB_RAX+1, e ) );
}


/* Read/write various widths of %RAX, as it has various
   special-purpose uses. */

static const HChar* nameIRegRAX ( Int sz )
{
   switch (sz) {
      case 1: return "%al";
      case 2: return "%ax";
      case 4: return "%eax";
      case 8: return "%rax";
      default: vpanic("nameIRegRAX(amd64)");
   }
}

static IRExpr* getIRegRAX ( Int sz )
{
   vassert(host_endness == VexEndnessLE);
   switch (sz) {
      case 1: return IRExpr_Get( OFFB_RAX, Ity_I8 );
      case 2: return IRExpr_Get( OFFB_RAX, Ity_I16 );
      case 4: return unop(Iop_64to32, IRExpr_Get( OFFB_RAX, Ity_I64 ));
      case 8: return IRExpr_Get( OFFB_RAX, Ity_I64 );
      default: vpanic("getIRegRAX(amd64)");
   }
}

static void putIRegRAX ( Int sz, IRExpr* e )
{
   IRType ty = typeOfIRExpr(irsb->tyenv, e);
   vassert(host_endness == VexEndnessLE);
   switch (sz) {
      case 8: vassert(ty == Ity_I64);
              stmt( IRStmt_Put( OFFB_RAX, e ));
              break;
      case 4: vassert(ty == Ity_I32);
              stmt( IRStmt_Put( OFFB_RAX, unop(Iop_32Uto64,e) ));
              break;
      case 2: vassert(ty == Ity_I16);
              stmt( IRStmt_Put( OFFB_RAX, e ));
              break;
      case 1: vassert(ty == Ity_I8);
              stmt( IRStmt_Put( OFFB_RAX, e ));
              break;
      default: vpanic("putIRegRAX(amd64)");
   }
}


/* Read/write various widths of %RDX, as it has various
   special-purpose uses. */

static const HChar* nameIRegRDX ( Int sz )
{
   switch (sz) {
      case 1: return "%dl";
      case 2: return "%dx";
      case 4: return "%edx";
      case 8: return "%rdx";
      default: vpanic("nameIRegRDX(amd64)");
   }
}

static IRExpr* getIRegRDX ( Int sz )
{
   vassert(host_endness == VexEndnessLE);
   switch (sz) {
      case 1: return IRExpr_Get( OFFB_RDX, Ity_I8 );
      case 2: return IRExpr_Get( OFFB_RDX, Ity_I16 );
      case 4: return unop(Iop_64to32, IRExpr_Get( OFFB_RDX, Ity_I64 ));
      case 8: return IRExpr_Get( OFFB_RDX, Ity_I64 );
      default: vpanic("getIRegRDX(amd64)");
   }
}

static void putIRegRDX ( Int sz, IRExpr* e )
{
   vassert(host_endness == VexEndnessLE);
   vassert(typeOfIRExpr(irsb->tyenv, e) == szToITy(sz));
   switch (sz) {
      case 8: stmt( IRStmt_Put( OFFB_RDX, e ));
              break;
      case 4: stmt( IRStmt_Put( OFFB_RDX, unop(Iop_32Uto64,e) ));
              break;
      case 2: stmt( IRStmt_Put( OFFB_RDX, e ));
              break;
      case 1: stmt( IRStmt_Put( OFFB_RDX, e ));
              break;
      default: vpanic("putIRegRDX(amd64)");
   }
}


/* Simplistic functions to deal with the integer registers as a
   straightforward bank of 16 64-bit regs. */

static IRExpr* getIReg64 ( UInt regno )
{
   return IRExpr_Get( integerGuestReg64Offset(regno),
                      Ity_I64 );
}

static void putIReg64 ( UInt regno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I64);
   stmt( IRStmt_Put( integerGuestReg64Offset(regno), e ) );
}

static const HChar* nameIReg64 ( UInt regno )
{
   return nameIReg( 8, regno, False );
}


/* Simplistic functions to deal with the lower halves of integer
   registers as a straightforward bank of 16 32-bit regs. */

static IRExpr* getIReg32 ( UInt regno )
{
   vassert(host_endness == VexEndnessLE);
   return unop(Iop_64to32,
               IRExpr_Get( integerGuestReg64Offset(regno),
                           Ity_I64 ));
}

static void putIReg32 ( UInt regno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I32);
   stmt( IRStmt_Put( integerGuestReg64Offset(regno),
                     unop(Iop_32Uto64,e) ) );
}

static const HChar* nameIReg32 ( UInt regno )
{
   return nameIReg( 4, regno, False );
}


/* Simplistic functions to deal with the lower quarters of integer
   registers as a straightforward bank of 16 16-bit regs. */

static IRExpr* getIReg16 ( UInt regno )
{
   vassert(host_endness == VexEndnessLE);
   return IRExpr_Get( integerGuestReg64Offset(regno),
                      Ity_I16 );
}

static void putIReg16 ( UInt regno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I16);
   stmt( IRStmt_Put( integerGuestReg64Offset(regno),
                     unop(Iop_16Uto64,e) ) );
}

static const HChar* nameIReg16 ( UInt regno )
{
   return nameIReg( 2, regno, False );
}


/* Sometimes what we know is a 3-bit register number, a REX byte, and
   which field of the REX byte is to be used to extend to a 4-bit
   number.  These functions cater for that situation.
*/
static IRExpr* getIReg64rexX ( Prefix pfx, UInt lo3bits )
{
   vassert(lo3bits < 8);
   vassert(IS_VALID_PFX(pfx));
   return getIReg64( lo3bits | (getRexX(pfx) << 3) );
}

static const HChar* nameIReg64rexX ( Prefix pfx, UInt lo3bits )
{
   vassert(lo3bits < 8);
   vassert(IS_VALID_PFX(pfx));
   return nameIReg( 8, lo3bits | (getRexX(pfx) << 3), False );
}

static const HChar* nameIRegRexB ( Int sz, Prefix pfx, UInt lo3bits )
{
   vassert(lo3bits < 8);
   vassert(IS_VALID_PFX(pfx));
   vassert(sz == 8 || sz == 4 || sz == 2 || sz == 1);
   return nameIReg( sz, lo3bits | (getRexB(pfx) << 3),
                        toBool(sz==1 && !haveREX(pfx)) );
}

static IRExpr* getIRegRexB ( Int sz, Prefix pfx, UInt lo3bits )
{
   vassert(lo3bits < 8);
   vassert(IS_VALID_PFX(pfx));
   vassert(sz == 8 || sz == 4 || sz == 2 || sz == 1);
   if (sz == 4) {
      sz = 8;
      return unop(Iop_64to32,
                  IRExpr_Get(
                     offsetIReg( sz, lo3bits | (getRexB(pfx) << 3),
                                     False/*!irregular*/ ),
                     szToITy(sz)
                 )
             );
   } else {
      return IRExpr_Get(
                offsetIReg( sz, lo3bits | (getRexB(pfx) << 3),
                                toBool(sz==1 && !haveREX(pfx)) ),
                szToITy(sz)
             );
   }
}

static void putIRegRexB ( Int sz, Prefix pfx, UInt lo3bits, IRExpr* e )
{
   vassert(lo3bits < 8);
   vassert(IS_VALID_PFX(pfx));
   vassert(sz == 8 || sz == 4 || sz == 2 || sz == 1);
   vassert(typeOfIRExpr(irsb->tyenv, e) == szToITy(sz));
   stmt( IRStmt_Put(
            offsetIReg( sz, lo3bits | (getRexB(pfx) << 3),
                            toBool(sz==1 && !haveREX(pfx)) ),
            sz==4 ? unop(Iop_32Uto64,e) : e
   ));
}


/* Functions for getting register numbers from modrm bytes and REX
   when we don't have to consider the complexities of integer subreg
   accesses.
*/
/* Extract the g reg field from a modRM byte, and augment it using the
   REX.R bit from the supplied REX byte.  The R bit usually is
   associated with the g register field.
*/
static UInt gregOfRexRM ( Prefix pfx, UChar mod_reg_rm )
{
   Int reg = (Int)( (mod_reg_rm >> 3) & 7 );
   reg += (pfx & PFX_REXR) ? 8 : 0;
   return reg;
}

/* Extract the e reg field from a modRM byte, and augment it using the
   REX.B bit from the supplied REX byte.  The B bit usually is
   associated with the e register field (when modrm indicates e is a
   register, that is).
*/
static UInt eregOfRexRM ( Prefix pfx, UChar mod_reg_rm )
{
   Int rm;
   vassert(epartIsReg(mod_reg_rm));
   rm = (Int)(mod_reg_rm & 0x7);
   rm += (pfx & PFX_REXB) ? 8 : 0;
   return rm;
}


/* General functions for dealing with integer register access. */

/* Produce the guest state offset for a reference to the 'g' register
   field in a modrm byte, taking into account REX (or its absence),
   and the size of the access.
*/
static UInt offsetIRegG ( Int sz, Prefix pfx, UChar mod_reg_rm )
{
   UInt reg;
   vassert(host_endness == VexEndnessLE);
   vassert(IS_VALID_PFX(pfx));
   vassert(sz == 8 || sz == 4 || sz == 2 || sz == 1);
   reg = gregOfRexRM( pfx, mod_reg_rm );
   return offsetIReg( sz, reg, toBool(sz == 1 && !haveREX(pfx)) );
}

static
IRExpr* getIRegG ( Int sz, Prefix pfx, UChar mod_reg_rm )
{
   if (sz == 4) {
      sz = 8;
      return unop(Iop_64to32,
                  IRExpr_Get( offsetIRegG( sz, pfx, mod_reg_rm ),
                              szToITy(sz) ));
   } else {
      return IRExpr_Get( offsetIRegG( sz, pfx, mod_reg_rm ),
                         szToITy(sz) );
   }
}

static
void putIRegG ( Int sz, Prefix pfx, UChar mod_reg_rm, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == szToITy(sz));
   if (sz == 4) {
      e = unop(Iop_32Uto64,e);
   }
   stmt( IRStmt_Put( offsetIRegG( sz, pfx, mod_reg_rm ), e ) );
}

static
const HChar* nameIRegG ( Int sz, Prefix pfx, UChar mod_reg_rm )
{
   return nameIReg( sz, gregOfRexRM(pfx,mod_reg_rm),
                        toBool(sz==1 && !haveREX(pfx)) );
}


static
IRExpr* getIRegV ( Int sz, Prefix pfx )
{
   if (sz == 4) {
      sz = 8;
      return unop(Iop_64to32,
                  IRExpr_Get( offsetIReg( sz, getVexNvvvv(pfx), False ),
                              szToITy(sz) ));
   } else {
      return IRExpr_Get( offsetIReg( sz, getVexNvvvv(pfx), False ),
                         szToITy(sz) );
   }
}

static
void putIRegV ( Int sz, Prefix pfx, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == szToITy(sz));
   if (sz == 4) {
      e = unop(Iop_32Uto64,e);
   }
   stmt( IRStmt_Put( offsetIReg( sz, getVexNvvvv(pfx), False ), e ) );
}

static
const HChar* nameIRegV ( Int sz, Prefix pfx )
{
   return nameIReg( sz, getVexNvvvv(pfx), False );
}



/* Produce the guest state offset for a reference to the 'e' register
   field in a modrm byte, taking into account REX (or its absence),
   and the size of the access.  eregOfRexRM will assert if mod_reg_rm
   denotes a memory access rather than a register access.
*/
static UInt offsetIRegE ( Int sz, Prefix pfx, UChar mod_reg_rm )
{
   UInt reg;
   vassert(host_endness == VexEndnessLE);
   vassert(IS_VALID_PFX(pfx));
   vassert(sz == 8 || sz == 4 || sz == 2 || sz == 1);
   reg = eregOfRexRM( pfx, mod_reg_rm );
   return offsetIReg( sz, reg, toBool(sz == 1 && !haveREX(pfx)) );
}

static
IRExpr* getIRegE ( Int sz, Prefix pfx, UChar mod_reg_rm )
{
   if (sz == 4) {
      sz = 8;
      return unop(Iop_64to32,
                  IRExpr_Get( offsetIRegE( sz, pfx, mod_reg_rm ),
                              szToITy(sz) ));
   } else {
      return IRExpr_Get( offsetIRegE( sz, pfx, mod_reg_rm ),
                         szToITy(sz) );
   }
}

static
void putIRegE ( Int sz, Prefix pfx, UChar mod_reg_rm, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == szToITy(sz));
   if (sz == 4) {
      e = unop(Iop_32Uto64,e);
   }
   stmt( IRStmt_Put( offsetIRegE( sz, pfx, mod_reg_rm ), e ) );
}

static
const HChar* nameIRegE ( Int sz, Prefix pfx, UChar mod_reg_rm )
{
   return nameIReg( sz, eregOfRexRM(pfx,mod_reg_rm),
                        toBool(sz==1 && !haveREX(pfx)) );
}


/*------------------------------------------------------------*/
/*--- For dealing with XMM registers                       ---*/
/*------------------------------------------------------------*/

static Int ymmGuestRegOffset ( UInt ymmreg )
{
   switch (ymmreg) {
      case 0:  return OFFB_YMM0;
      case 1:  return OFFB_YMM1;
      case 2:  return OFFB_YMM2;
      case 3:  return OFFB_YMM3;
      case 4:  return OFFB_YMM4;
      case 5:  return OFFB_YMM5;
      case 6:  return OFFB_YMM6;
      case 7:  return OFFB_YMM7;
      case 8:  return OFFB_YMM8;
      case 9:  return OFFB_YMM9;
      case 10: return OFFB_YMM10;
      case 11: return OFFB_YMM11;
      case 12: return OFFB_YMM12;
      case 13: return OFFB_YMM13;
      case 14: return OFFB_YMM14;
      case 15: return OFFB_YMM15;
      default: vpanic("ymmGuestRegOffset(amd64)");
   }
}

static Int xmmGuestRegOffset ( UInt xmmreg )
{
   /* Correct for little-endian host only. */
   vassert(host_endness == VexEndnessLE);
   return ymmGuestRegOffset( xmmreg );
}

/* Lanes of vector registers are always numbered from zero being the
   least significant lane (rightmost in the register).  */

static Int xmmGuestRegLane16offset ( UInt xmmreg, Int laneno )
{
   /* Correct for little-endian host only. */
   vassert(host_endness == VexEndnessLE);
   vassert(laneno >= 0 && laneno < 8);
   return xmmGuestRegOffset( xmmreg ) + 2 * laneno;
}

static Int xmmGuestRegLane32offset ( UInt xmmreg, Int laneno )
{
   /* Correct for little-endian host only. */
   vassert(host_endness == VexEndnessLE);
   vassert(laneno >= 0 && laneno < 4);
   return xmmGuestRegOffset( xmmreg ) + 4 * laneno;
}

static Int xmmGuestRegLane64offset ( UInt xmmreg, Int laneno )
{
   /* Correct for little-endian host only. */
   vassert(host_endness == VexEndnessLE);
   vassert(laneno >= 0 && laneno < 2);
   return xmmGuestRegOffset( xmmreg ) + 8 * laneno;
}

static Int ymmGuestRegLane128offset ( UInt ymmreg, Int laneno )
{
   /* Correct for little-endian host only. */
   vassert(host_endness == VexEndnessLE);
   vassert(laneno >= 0 && laneno < 2);
   return ymmGuestRegOffset( ymmreg ) + 16 * laneno;
}

static Int ymmGuestRegLane64offset ( UInt ymmreg, Int laneno )
{
   /* Correct for little-endian host only. */
   vassert(host_endness == VexEndnessLE);
   vassert(laneno >= 0 && laneno < 4);
   return ymmGuestRegOffset( ymmreg ) + 8 * laneno;
}

static Int ymmGuestRegLane32offset ( UInt ymmreg, Int laneno )
{
   /* Correct for little-endian host only. */
   vassert(host_endness == VexEndnessLE);
   vassert(laneno >= 0 && laneno < 8);
   return ymmGuestRegOffset( ymmreg ) + 4 * laneno;
}

static IRExpr* getXMMReg ( UInt xmmreg )
{
   return IRExpr_Get( xmmGuestRegOffset(xmmreg), Ity_V128 );
}

static IRExpr* getXMMRegLane64 ( UInt xmmreg, Int laneno )
{
   return IRExpr_Get( xmmGuestRegLane64offset(xmmreg,laneno), Ity_I64 );
}

static IRExpr* getXMMRegLane64F ( UInt xmmreg, Int laneno )
{
   return IRExpr_Get( xmmGuestRegLane64offset(xmmreg,laneno), Ity_F64 );
}

static IRExpr* getXMMRegLane32 ( UInt xmmreg, Int laneno )
{
   return IRExpr_Get( xmmGuestRegLane32offset(xmmreg,laneno), Ity_I32 );
}

static IRExpr* getXMMRegLane32F ( UInt xmmreg, Int laneno )
{
   return IRExpr_Get( xmmGuestRegLane32offset(xmmreg,laneno), Ity_F32 );
}

static IRExpr* getXMMRegLane16 ( UInt xmmreg, Int laneno )
{
  return IRExpr_Get( xmmGuestRegLane16offset(xmmreg,laneno), Ity_I16 );
}

static void putXMMReg ( UInt xmmreg, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_V128);
   stmt( IRStmt_Put( xmmGuestRegOffset(xmmreg), e ) );
}

static void putXMMRegLane64 ( UInt xmmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I64);
   stmt( IRStmt_Put( xmmGuestRegLane64offset(xmmreg,laneno), e ) );
}

static void putXMMRegLane64F ( UInt xmmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_F64);
   stmt( IRStmt_Put( xmmGuestRegLane64offset(xmmreg,laneno), e ) );
}

static void putXMMRegLane32F ( UInt xmmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_F32);
   stmt( IRStmt_Put( xmmGuestRegLane32offset(xmmreg,laneno), e ) );
}

static void putXMMRegLane32 ( UInt xmmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I32);
   stmt( IRStmt_Put( xmmGuestRegLane32offset(xmmreg,laneno), e ) );
}

static IRExpr* getYMMReg ( UInt xmmreg )
{
   return IRExpr_Get( ymmGuestRegOffset(xmmreg), Ity_V256 );
}

static IRExpr* getYMMRegLane128 ( UInt ymmreg, Int laneno )
{
   return IRExpr_Get( ymmGuestRegLane128offset(ymmreg,laneno), Ity_V128 );
}

static IRExpr* getYMMRegLane64 ( UInt ymmreg, Int laneno )
{
   return IRExpr_Get( ymmGuestRegLane64offset(ymmreg,laneno), Ity_I64 );
}

static IRExpr* getYMMRegLane32 ( UInt ymmreg, Int laneno )
{
   return IRExpr_Get( ymmGuestRegLane32offset(ymmreg,laneno), Ity_I32 );
}

static void putYMMReg ( UInt ymmreg, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_V256);
   stmt( IRStmt_Put( ymmGuestRegOffset(ymmreg), e ) );
}

static void putYMMRegLane128 ( UInt ymmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_V128);
   stmt( IRStmt_Put( ymmGuestRegLane128offset(ymmreg,laneno), e ) );
}

static void putYMMRegLane64F ( UInt ymmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_F64);
   stmt( IRStmt_Put( ymmGuestRegLane64offset(ymmreg,laneno), e ) );
}

static void putYMMRegLane64 ( UInt ymmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I64);
   stmt( IRStmt_Put( ymmGuestRegLane64offset(ymmreg,laneno), e ) );
}

static void putYMMRegLane32F ( UInt ymmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_F32);
   stmt( IRStmt_Put( ymmGuestRegLane32offset(ymmreg,laneno), e ) );
}

static void putYMMRegLane32 ( UInt ymmreg, Int laneno, IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I32);
   stmt( IRStmt_Put( ymmGuestRegLane32offset(ymmreg,laneno), e ) );
}

static IRExpr* mkV128 ( UShort mask )
{
   return IRExpr_Const(IRConst_V128(mask));
}

/* Write the low half of a YMM reg and zero out the upper half. */
static void putYMMRegLoAndZU ( UInt ymmreg, IRExpr* e )
{
   putYMMRegLane128( ymmreg, 0, e );
   putYMMRegLane128( ymmreg, 1, mkV128(0) );
}

static IRExpr* mkAnd1 ( IRExpr* x, IRExpr* y )
{
   vassert(typeOfIRExpr(irsb->tyenv,x) == Ity_I1);
   vassert(typeOfIRExpr(irsb->tyenv,y) == Ity_I1);
   return unop(Iop_64to1,
               binop(Iop_And64,
                     unop(Iop_1Uto64,x),
                     unop(Iop_1Uto64,y)));
}

/* Generate a compare-and-swap operation, operating on memory at
   'addr'.  The expected value is 'expVal' and the new value is
   'newVal'.  If the operation fails, then transfer control (with a
   no-redir jump (XXX no -- see comment at top of this file)) to
   'restart_point', which is presumably the address of the guest
   instruction again -- retrying, essentially. */
static void casLE ( IRExpr* addr, IRExpr* expVal, IRExpr* newVal,
                    Addr64 restart_point )
{
   IRCAS* cas;
   IRType tyE    = typeOfIRExpr(irsb->tyenv, expVal);
   IRType tyN    = typeOfIRExpr(irsb->tyenv, newVal);
   IRTemp oldTmp = newTemp(tyE);
   IRTemp expTmp = newTemp(tyE);
   vassert(tyE == tyN);
   vassert(tyE == Ity_I64 || tyE == Ity_I32
           || tyE == Ity_I16 || tyE == Ity_I8);
   assign(expTmp, expVal);
   cas = mkIRCAS( IRTemp_INVALID, oldTmp, Iend_LE, addr,
                  NULL, mkexpr(expTmp), NULL, newVal );
   stmt( IRStmt_CAS(cas) );
   stmt( IRStmt_Exit(
            binop( mkSizedOp(tyE,Iop_CasCmpNE8),
                   mkexpr(oldTmp), mkexpr(expTmp) ),
            Ijk_Boring, /*Ijk_NoRedir*/
            IRConst_U64( restart_point ),
            OFFB_RIP
         ));
}


/*------------------------------------------------------------*/
/*--- Helpers for %rflags.                                 ---*/
/*------------------------------------------------------------*/

/* -------------- Evaluating the flags-thunk. -------------- */

/* Build IR to calculate all the eflags from stored
   CC_OP/CC_DEP1/CC_DEP2/CC_NDEP.  Returns an expression ::
   Ity_I64. */
static IRExpr* mk_amd64g_calculate_rflags_all ( void )
{
   IRExpr** args
      = mkIRExprVec_4( IRExpr_Get(OFFB_CC_OP,   Ity_I64),
                       IRExpr_Get(OFFB_CC_DEP1, Ity_I64),
                       IRExpr_Get(OFFB_CC_DEP2, Ity_I64),
                       IRExpr_Get(OFFB_CC_NDEP, Ity_I64) );
   IRExpr* call
      = mkIRExprCCall(
           Ity_I64,
           0/*regparm*/,
           "amd64g_calculate_rflags_all", &amd64g_calculate_rflags_all,
           args
        );
   /* Exclude OP and NDEP from definedness checking.  We're only
      interested in DEP1 and DEP2. */
   call->Iex.CCall.cee->mcx_mask = (1<<0) | (1<<3);
   return call;
}

/* Build IR to calculate some particular condition from stored
   CC_OP/CC_DEP1/CC_DEP2/CC_NDEP.  Returns an expression ::
   Ity_Bit. */
static IRExpr* mk_amd64g_calculate_condition ( AMD64Condcode cond )
{
   IRExpr** args
      = mkIRExprVec_5( mkU64(cond),
                       IRExpr_Get(OFFB_CC_OP,   Ity_I64),
                       IRExpr_Get(OFFB_CC_DEP1, Ity_I64),
                       IRExpr_Get(OFFB_CC_DEP2, Ity_I64),
                       IRExpr_Get(OFFB_CC_NDEP, Ity_I64) );
   IRExpr* call
      = mkIRExprCCall(
           Ity_I64,
           0/*regparm*/,
           "amd64g_calculate_condition", &amd64g_calculate_condition,
           args
        );
   /* Exclude the requested condition, OP and NDEP from definedness
      checking.  We're only interested in DEP1 and DEP2. */
   call->Iex.CCall.cee->mcx_mask = (1<<0) | (1<<1) | (1<<4);
   return unop(Iop_64to1, call);
}

/* Build IR to calculate just the carry flag from stored
   CC_OP/CC_DEP1/CC_DEP2/CC_NDEP.  Returns an expression :: Ity_I64. */
static IRExpr* mk_amd64g_calculate_rflags_c ( void )
{
   IRExpr** args
      = mkIRExprVec_4( IRExpr_Get(OFFB_CC_OP,   Ity_I64),
                       IRExpr_Get(OFFB_CC_DEP1, Ity_I64),
                       IRExpr_Get(OFFB_CC_DEP2, Ity_I64),
                       IRExpr_Get(OFFB_CC_NDEP, Ity_I64) );
   IRExpr* call
      = mkIRExprCCall(
           Ity_I64,
           0/*regparm*/,
           "amd64g_calculate_rflags_c", &amd64g_calculate_rflags_c,
           args
        );
   /* Exclude OP and NDEP from definedness checking.  We're only
      interested in DEP1 and DEP2. */
   call->Iex.CCall.cee->mcx_mask = (1<<0) | (1<<3);
   return call;
}


/* -------------- Building the flags-thunk. -------------- */

/* The machinery in this section builds the flag-thunk following a
   flag-setting operation.  Hence the various setFlags_* functions.
*/

static Bool isAddSub ( IROp op8 )
{
   return toBool(op8 == Iop_Add8 || op8 == Iop_Sub8);
}

static Bool isLogic ( IROp op8 )
{
   return toBool(op8 == Iop_And8 || op8 == Iop_Or8 || op8 == Iop_Xor8);
}

/* U-widen 1/8/16/32/64 bit int expr to 64. */
static IRExpr* widenUto64 ( IRExpr* e )
{
   switch (typeOfIRExpr(irsb->tyenv,e)) {
      case Ity_I64: return e;
      case Ity_I32: return unop(Iop_32Uto64, e);
      case Ity_I16: return unop(Iop_16Uto64, e);
      case Ity_I8:  return unop(Iop_8Uto64, e);
      case Ity_I1:  return unop(Iop_1Uto64, e);
      default: vpanic("widenUto64");
   }
}

/* S-widen 8/16/32/64 bit int expr to 32. */
static IRExpr* widenSto64 ( IRExpr* e )
{
   switch (typeOfIRExpr(irsb->tyenv,e)) {
      case Ity_I64: return e;
      case Ity_I32: return unop(Iop_32Sto64, e);
      case Ity_I16: return unop(Iop_16Sto64, e);
      case Ity_I8:  return unop(Iop_8Sto64, e);
      default: vpanic("widenSto64");
   }
}

/* Narrow 8/16/32/64 bit int expr to 8/16/32/64.  Clearly only some
   of these combinations make sense. */
static IRExpr* narrowTo ( IRType dst_ty, IRExpr* e )
{
   IRType src_ty = typeOfIRExpr(irsb->tyenv,e);
   if (src_ty == dst_ty)
      return e;
   if (src_ty == Ity_I32 && dst_ty == Ity_I16)
      return unop(Iop_32to16, e);
   if (src_ty == Ity_I32 && dst_ty == Ity_I8)
      return unop(Iop_32to8, e);
   if (src_ty == Ity_I64 && dst_ty == Ity_I32)
      return unop(Iop_64to32, e);
   if (src_ty == Ity_I64 && dst_ty == Ity_I16)
      return unop(Iop_64to16, e);
   if (src_ty == Ity_I64 && dst_ty == Ity_I8)
      return unop(Iop_64to8, e);

   vex_printf("\nsrc, dst tys are: ");
   ppIRType(src_ty);
   vex_printf(", ");
   ppIRType(dst_ty);
   vex_printf("\n");
   vpanic("narrowTo(amd64)");
}


/* Set the flags thunk OP, DEP1 and DEP2 fields.  The supplied op is
   auto-sized up to the real op. */

static
void setFlags_DEP1_DEP2 ( IROp op8, IRTemp dep1, IRTemp dep2, IRType ty )
{
   Int ccOp = 0;
   switch (ty) {
      case Ity_I8:  ccOp = 0; break;
      case Ity_I16: ccOp = 1; break;
      case Ity_I32: ccOp = 2; break;
      case Ity_I64: ccOp = 3; break;
      default: vassert(0);
   }
   switch (op8) {
      case Iop_Add8: ccOp += AMD64G_CC_OP_ADDB;   break;
      case Iop_Sub8: ccOp += AMD64G_CC_OP_SUBB;   break;
      default:       ppIROp(op8);
                     vpanic("setFlags_DEP1_DEP2(amd64)");
   }
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(ccOp)) );
   stmt( IRStmt_Put( OFFB_CC_DEP1, widenUto64(mkexpr(dep1))) );
   stmt( IRStmt_Put( OFFB_CC_DEP2, widenUto64(mkexpr(dep2))) );
}


/* Set the OP and DEP1 fields only, and write zero to DEP2. */

static
void setFlags_DEP1 ( IROp op8, IRTemp dep1, IRType ty )
{
   Int ccOp = 0;
   switch (ty) {
      case Ity_I8:  ccOp = 0; break;
      case Ity_I16: ccOp = 1; break;
      case Ity_I32: ccOp = 2; break;
      case Ity_I64: ccOp = 3; break;
      default: vassert(0);
   }
   switch (op8) {
      case Iop_Or8:
      case Iop_And8:
      case Iop_Xor8: ccOp += AMD64G_CC_OP_LOGICB; break;
      default:       ppIROp(op8);
                     vpanic("setFlags_DEP1(amd64)");
   }
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(ccOp)) );
   stmt( IRStmt_Put( OFFB_CC_DEP1, widenUto64(mkexpr(dep1))) );
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0)) );
}


/* For shift operations, we put in the result and the undershifted
   result.  Except if the shift amount is zero, the thunk is left
   unchanged. */

static void setFlags_DEP1_DEP2_shift ( IROp    op64,
                                       IRTemp  res,
                                       IRTemp  resUS,
                                       IRType  ty,
                                       IRTemp  guard )
{
   Int ccOp = 0;
   switch (ty) {
      case Ity_I8:  ccOp = 0; break;
      case Ity_I16: ccOp = 1; break;
      case Ity_I32: ccOp = 2; break;
      case Ity_I64: ccOp = 3; break;
      default: vassert(0);
   }

   vassert(guard);

   /* Both kinds of right shifts are handled by the same thunk
      operation. */
   switch (op64) {
      case Iop_Shr64:
      case Iop_Sar64: ccOp += AMD64G_CC_OP_SHRB; break;
      case Iop_Shl64: ccOp += AMD64G_CC_OP_SHLB; break;
      default:        ppIROp(op64);
                      vpanic("setFlags_DEP1_DEP2_shift(amd64)");
   }

   /* guard :: Ity_I8.  We need to convert it to I1. */
   IRTemp guardB = newTemp(Ity_I1);
   assign( guardB, binop(Iop_CmpNE8, mkexpr(guard), mkU8(0)) );

   /* DEP1 contains the result, DEP2 contains the undershifted value. */
   stmt( IRStmt_Put( OFFB_CC_OP,
                     IRExpr_ITE( mkexpr(guardB),
                                 mkU64(ccOp),
                                 IRExpr_Get(OFFB_CC_OP,Ity_I64) ) ));
   stmt( IRStmt_Put( OFFB_CC_DEP1,
                     IRExpr_ITE( mkexpr(guardB),
                                 widenUto64(mkexpr(res)),
                                 IRExpr_Get(OFFB_CC_DEP1,Ity_I64) ) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2,
                     IRExpr_ITE( mkexpr(guardB),
                                 widenUto64(mkexpr(resUS)),
                                 IRExpr_Get(OFFB_CC_DEP2,Ity_I64) ) ));
}


/* For the inc/dec case, we store in DEP1 the result value and in NDEP
   the former value of the carry flag, which unfortunately we have to
   compute. */

static void setFlags_INC_DEC ( Bool inc, IRTemp res, IRType ty )
{
   Int ccOp = inc ? AMD64G_CC_OP_INCB : AMD64G_CC_OP_DECB;

   switch (ty) {
      case Ity_I8:  ccOp += 0; break;
      case Ity_I16: ccOp += 1; break;
      case Ity_I32: ccOp += 2; break;
      case Ity_I64: ccOp += 3; break;
      default: vassert(0);
   }

   /* This has to come first, because calculating the C flag
      may require reading all four thunk fields. */
   stmt( IRStmt_Put( OFFB_CC_NDEP, mk_amd64g_calculate_rflags_c()) );
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(ccOp)) );
   stmt( IRStmt_Put( OFFB_CC_DEP1, widenUto64(mkexpr(res))) );
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0)) );
}


/* Multiplies are pretty much like add and sub: DEP1 and DEP2 hold the
   two arguments. */

static
void setFlags_MUL ( IRType ty, IRTemp arg1, IRTemp arg2, ULong base_op )
{
   switch (ty) {
      case Ity_I8:
         stmt( IRStmt_Put( OFFB_CC_OP, mkU64(base_op+0) ) );
         break;
      case Ity_I16:
         stmt( IRStmt_Put( OFFB_CC_OP, mkU64(base_op+1) ) );
         break;
      case Ity_I32:
         stmt( IRStmt_Put( OFFB_CC_OP, mkU64(base_op+2) ) );
         break;
      case Ity_I64:
         stmt( IRStmt_Put( OFFB_CC_OP, mkU64(base_op+3) ) );
         break;
      default:
         vpanic("setFlags_MUL(amd64)");
   }
   stmt( IRStmt_Put( OFFB_CC_DEP1, widenUto64(mkexpr(arg1)) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, widenUto64(mkexpr(arg2)) ));
}


/* -------------- Condition codes. -------------- */

/* Condition codes, using the AMD encoding.  */

static const HChar* name_AMD64Condcode ( AMD64Condcode cond )
{
   switch (cond) {
      case AMD64CondO:      return "o";
      case AMD64CondNO:     return "no";
      case AMD64CondB:      return "b";
      case AMD64CondNB:     return "ae"; /*"nb";*/
      case AMD64CondZ:      return "e"; /*"z";*/
      case AMD64CondNZ:     return "ne"; /*"nz";*/
      case AMD64CondBE:     return "be";
      case AMD64CondNBE:    return "a"; /*"nbe";*/
      case AMD64CondS:      return "s";
      case AMD64CondNS:     return "ns";
      case AMD64CondP:      return "p";
      case AMD64CondNP:     return "np";
      case AMD64CondL:      return "l";
      case AMD64CondNL:     return "ge"; /*"nl";*/
      case AMD64CondLE:     return "le";
      case AMD64CondNLE:    return "g"; /*"nle";*/
      case AMD64CondAlways: return "ALWAYS";
      default: vpanic("name_AMD64Condcode");
   }
}

static
AMD64Condcode positiveIse_AMD64Condcode ( AMD64Condcode  cond,
                                          /*OUT*/Bool*   needInvert )
{
   vassert(cond >= AMD64CondO && cond <= AMD64CondNLE);
   if (cond & 1) {
      *needInvert = True;
      return cond-1;
   } else {
      *needInvert = False;
      return cond;
   }
}


/* -------------- Helpers for ADD/SUB with carry. -------------- */

/* Given ta1, ta2 and tres, compute tres = ADC(ta1,ta2) and set flags
   appropriately.

   Optionally, generate a store for the 'tres' value.  This can either
   be a normal store, or it can be a cas-with-possible-failure style
   store:

   if taddr is IRTemp_INVALID, then no store is generated.

   if taddr is not IRTemp_INVALID, then a store (using taddr as
   the address) is generated:

     if texpVal is IRTemp_INVALID then a normal store is
     generated, and restart_point must be zero (it is irrelevant).

     if texpVal is not IRTemp_INVALID then a cas-style store is
     generated.  texpVal is the expected value, restart_point
     is the restart point if the store fails, and texpVal must
     have the same type as tres.

*/
static void helper_ADC ( Int sz,
                         IRTemp tres, IRTemp ta1, IRTemp ta2,
                         /* info about optional store: */
                         IRTemp taddr, IRTemp texpVal, Addr64 restart_point )
{
   UInt    thunkOp;
   IRType  ty    = szToITy(sz);
   IRTemp  oldc  = newTemp(Ity_I64);
   IRTemp  oldcn = newTemp(ty);
   IROp    plus  = mkSizedOp(ty, Iop_Add8);
   IROp    xor   = mkSizedOp(ty, Iop_Xor8);

   vassert(typeOfIRTemp(irsb->tyenv, tres) == ty);

   switch (sz) {
      case 8:  thunkOp = AMD64G_CC_OP_ADCQ; break;
      case 4:  thunkOp = AMD64G_CC_OP_ADCL; break;
      case 2:  thunkOp = AMD64G_CC_OP_ADCW; break;
      case 1:  thunkOp = AMD64G_CC_OP_ADCB; break;
      default: vassert(0);
   }

   /* oldc = old carry flag, 0 or 1 */
   assign( oldc,  binop(Iop_And64,
                        mk_amd64g_calculate_rflags_c(),
                        mkU64(1)) );

   assign( oldcn, narrowTo(ty, mkexpr(oldc)) );

   assign( tres, binop(plus,
                       binop(plus,mkexpr(ta1),mkexpr(ta2)),
                       mkexpr(oldcn)) );

   /* Possibly generate a store of 'tres' to 'taddr'.  See comment at
      start of this function. */
   if (taddr != IRTemp_INVALID) {
      if (texpVal == IRTemp_INVALID) {
         vassert(restart_point == 0);
         storeLE( mkexpr(taddr), mkexpr(tres) );
      } else {
         vassert(typeOfIRTemp(irsb->tyenv, texpVal) == ty);
         /* .. and hence 'texpVal' has the same type as 'tres'. */
         casLE( mkexpr(taddr),
                mkexpr(texpVal), mkexpr(tres), restart_point );
      }
   }

   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(thunkOp) ) );
   stmt( IRStmt_Put( OFFB_CC_DEP1, widenUto64(mkexpr(ta1))  ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, widenUto64(binop(xor, mkexpr(ta2),
                                                         mkexpr(oldcn)) )) );
   stmt( IRStmt_Put( OFFB_CC_NDEP, mkexpr(oldc) ) );
}


/* Given ta1, ta2 and tres, compute tres = SBB(ta1,ta2) and set flags
   appropriately.  As with helper_ADC, possibly generate a store of
   the result -- see comments on helper_ADC for details.
*/
static void helper_SBB ( Int sz,
                         IRTemp tres, IRTemp ta1, IRTemp ta2,
                         /* info about optional store: */
                         IRTemp taddr, IRTemp texpVal, Addr64 restart_point )
{
   UInt    thunkOp;
   IRType  ty    = szToITy(sz);
   IRTemp  oldc  = newTemp(Ity_I64);
   IRTemp  oldcn = newTemp(ty);
   IROp    minus = mkSizedOp(ty, Iop_Sub8);
   IROp    xor   = mkSizedOp(ty, Iop_Xor8);

   vassert(typeOfIRTemp(irsb->tyenv, tres) == ty);

   switch (sz) {
      case 8:  thunkOp = AMD64G_CC_OP_SBBQ; break;
      case 4:  thunkOp = AMD64G_CC_OP_SBBL; break;
      case 2:  thunkOp = AMD64G_CC_OP_SBBW; break;
      case 1:  thunkOp = AMD64G_CC_OP_SBBB; break;
      default: vassert(0);
   }

   /* oldc = old carry flag, 0 or 1 */
   assign( oldc, binop(Iop_And64,
                       mk_amd64g_calculate_rflags_c(),
                       mkU64(1)) );

   assign( oldcn, narrowTo(ty, mkexpr(oldc)) );

   assign( tres, binop(minus,
                       binop(minus,mkexpr(ta1),mkexpr(ta2)),
                       mkexpr(oldcn)) );

   /* Possibly generate a store of 'tres' to 'taddr'.  See comment at
      start of this function. */
   if (taddr != IRTemp_INVALID) {
      if (texpVal == IRTemp_INVALID) {
         vassert(restart_point == 0);
         storeLE( mkexpr(taddr), mkexpr(tres) );
      } else {
         vassert(typeOfIRTemp(irsb->tyenv, texpVal) == ty);
         /* .. and hence 'texpVal' has the same type as 'tres'. */
         casLE( mkexpr(taddr),
                mkexpr(texpVal), mkexpr(tres), restart_point );
      }
   }

   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(thunkOp) ) );
   stmt( IRStmt_Put( OFFB_CC_DEP1, widenUto64(mkexpr(ta1) )) );
   stmt( IRStmt_Put( OFFB_CC_DEP2, widenUto64(binop(xor, mkexpr(ta2),
                                                         mkexpr(oldcn)) )) );
   stmt( IRStmt_Put( OFFB_CC_NDEP, mkexpr(oldc) ) );
}


/* -------------- Helpers for disassembly printing. -------------- */

static const HChar* nameGrp1 ( Int opc_aux )
{
   static const HChar* grp1_names[8]
     = { "add", "or", "adc", "sbb", "and", "sub", "xor", "cmp" };
   if (opc_aux < 0 || opc_aux > 7) vpanic("nameGrp1(amd64)");
   return grp1_names[opc_aux];
}

static const HChar* nameGrp2 ( Int opc_aux )
{
   static const HChar* grp2_names[8]
     = { "rol", "ror", "rcl", "rcr", "shl", "shr", "shl", "sar" };
   if (opc_aux < 0 || opc_aux > 7) vpanic("nameGrp2(amd64)");
   return grp2_names[opc_aux];
}

static const HChar* nameGrp4 ( Int opc_aux )
{
   static const HChar* grp4_names[8]
     = { "inc", "dec", "???", "???", "???", "???", "???", "???" };
   if (opc_aux < 0 || opc_aux > 1) vpanic("nameGrp4(amd64)");
   return grp4_names[opc_aux];
}

static const HChar* nameGrp5 ( Int opc_aux )
{
   static const HChar* grp5_names[8]
     = { "inc", "dec", "call*", "call*", "jmp*", "jmp*", "push", "???" };
   if (opc_aux < 0 || opc_aux > 6) vpanic("nameGrp5(amd64)");
   return grp5_names[opc_aux];
}

static const HChar* nameGrp8 ( Int opc_aux )
{
   static const HChar* grp8_names[8]
      = { "???", "???", "???", "???", "bt", "bts", "btr", "btc" };
   if (opc_aux < 4 || opc_aux > 7) vpanic("nameGrp8(amd64)");
   return grp8_names[opc_aux];
}

static const HChar* nameSReg ( UInt sreg )
{
   switch (sreg) {
      case R_ES: return "%es";
      case R_CS: return "%cs";
      case R_SS: return "%ss";
      case R_DS: return "%ds";
      case R_FS: return "%fs";
      case R_GS: return "%gs";
      default: vpanic("nameSReg(amd64)");
   }
}

static const HChar* nameMMXReg ( Int mmxreg )
{
   static const HChar* mmx_names[8]
     = { "%mm0", "%mm1", "%mm2", "%mm3", "%mm4", "%mm5", "%mm6", "%mm7" };
   if (mmxreg < 0 || mmxreg > 7) vpanic("nameMMXReg(amd64,guest)");
   return mmx_names[mmxreg];
}

static const HChar* nameXMMReg ( Int xmmreg )
{
   static const HChar* xmm_names[16]
     = { "%xmm0",  "%xmm1",  "%xmm2",  "%xmm3",
         "%xmm4",  "%xmm5",  "%xmm6",  "%xmm7",
         "%xmm8",  "%xmm9",  "%xmm10", "%xmm11",
         "%xmm12", "%xmm13", "%xmm14", "%xmm15" };
   if (xmmreg < 0 || xmmreg > 15) vpanic("nameXMMReg(amd64)");
   return xmm_names[xmmreg];
}

static const HChar* nameMMXGran ( Int gran )
{
   switch (gran) {
      case 0: return "b";
      case 1: return "w";
      case 2: return "d";
      case 3: return "q";
      default: vpanic("nameMMXGran(amd64,guest)");
   }
}

static HChar nameISize ( Int size )
{
   switch (size) {
      case 8: return 'q';
      case 4: return 'l';
      case 2: return 'w';
      case 1: return 'b';
      default: vpanic("nameISize(amd64)");
   }
}

static const HChar* nameYMMReg ( Int ymmreg )
{
   static const HChar* ymm_names[16]
     = { "%ymm0",  "%ymm1",  "%ymm2",  "%ymm3",
         "%ymm4",  "%ymm5",  "%ymm6",  "%ymm7",
         "%ymm8",  "%ymm9",  "%ymm10", "%ymm11",
         "%ymm12", "%ymm13", "%ymm14", "%ymm15" };
   if (ymmreg < 0 || ymmreg > 15) vpanic("nameYMMReg(amd64)");
   return ymm_names[ymmreg];
}


/*------------------------------------------------------------*/
/*--- JMP helpers                                          ---*/
/*------------------------------------------------------------*/

static void jmp_lit( /*MOD*/DisResult* dres,
                     IRJumpKind kind, Addr64 d64 )
{
   vassert(dres->whatNext    == Dis_Continue);
   vassert(dres->len         == 0);
   vassert(dres->continueAt  == 0);
   vassert(dres->jk_StopHere == Ijk_INVALID);
   dres->whatNext    = Dis_StopHere;
   dres->jk_StopHere = kind;
   stmt( IRStmt_Put( OFFB_RIP, mkU64(d64) ) );
}

static void jmp_treg( /*MOD*/DisResult* dres,
                      IRJumpKind kind, IRTemp t )
{
   vassert(dres->whatNext    == Dis_Continue);
   vassert(dres->len         == 0);
   vassert(dres->continueAt  == 0);
   vassert(dres->jk_StopHere == Ijk_INVALID);
   dres->whatNext    = Dis_StopHere;
   dres->jk_StopHere = kind;
   stmt( IRStmt_Put( OFFB_RIP, mkexpr(t) ) );
}

static
void jcc_01 ( /*MOD*/DisResult* dres,
              AMD64Condcode cond, Addr64 d64_false, Addr64 d64_true )
{
   Bool          invert;
   AMD64Condcode condPos;
   vassert(dres->whatNext    == Dis_Continue);
   vassert(dres->len         == 0);
   vassert(dres->continueAt  == 0);
   vassert(dres->jk_StopHere == Ijk_INVALID);
   dres->whatNext    = Dis_StopHere;
   dres->jk_StopHere = Ijk_Boring;
   condPos = positiveIse_AMD64Condcode ( cond, &invert );
   if (invert) {
      stmt( IRStmt_Exit( mk_amd64g_calculate_condition(condPos),
                         Ijk_Boring,
                         IRConst_U64(d64_false),
                         OFFB_RIP ) );
      stmt( IRStmt_Put( OFFB_RIP, mkU64(d64_true) ) );
   } else {
      stmt( IRStmt_Exit( mk_amd64g_calculate_condition(condPos),
                         Ijk_Boring,
                         IRConst_U64(d64_true),
                         OFFB_RIP ) );
      stmt( IRStmt_Put( OFFB_RIP, mkU64(d64_false) ) );
   }
}

/* Let new_rsp be the %rsp value after a call/return.  Let nia be the
   guest address of the next instruction to be executed.

   This function generates an AbiHint to say that -128(%rsp)
   .. -1(%rsp) should now be regarded as uninitialised.
*/
static
void make_redzone_AbiHint ( const VexAbiInfo* vbi,
                            IRTemp new_rsp, IRTemp nia, const HChar* who )
{
   Int szB = vbi->guest_stack_redzone_size;
   vassert(szB >= 0);

   /* A bit of a kludge.  Currently the only AbI we've guested AMD64
      for is ELF.  So just check it's the expected 128 value
      (paranoia). */
   vassert(szB == 128);

   if (0) vex_printf("AbiHint: %s\n", who);
   vassert(typeOfIRTemp(irsb->tyenv, new_rsp) == Ity_I64);
   vassert(typeOfIRTemp(irsb->tyenv, nia) == Ity_I64);
   if (szB > 0)
      stmt( IRStmt_AbiHint(
               binop(Iop_Sub64, mkexpr(new_rsp), mkU64(szB)),
               szB,
               mkexpr(nia)
            ));
}


/*------------------------------------------------------------*/
/*--- Disassembling addressing modes                       ---*/
/*------------------------------------------------------------*/

static
const HChar* segRegTxt ( Prefix pfx )
{
   if (pfx & PFX_CS) return "%cs:";
   if (pfx & PFX_DS) return "%ds:";
   if (pfx & PFX_ES) return "%es:";
   if (pfx & PFX_FS) return "%fs:";
   if (pfx & PFX_GS) return "%gs:";
   if (pfx & PFX_SS) return "%ss:";
   return ""; /* no override */
}


/* 'virtual' is an IRExpr* holding a virtual address.  Convert it to a
   linear address by adding any required segment override as indicated
   by sorb, and also dealing with any address size override
   present. */
static
IRExpr* handleAddrOverrides ( const VexAbiInfo* vbi,
                              Prefix pfx, IRExpr* virtual )
{
   /* Note that the below are hacks that relies on the assumption
      that %fs or %gs are constant.
      Typically, %fs is always 0x63 on linux (in the main thread, it
      stays at value 0), %gs always 0x60 on Darwin, ... */
   /* --- segment overrides --- */
   if (pfx & PFX_FS) {
      if (vbi->guest_amd64_assume_fs_is_const) {
         /* return virtual + guest_FS_CONST. */
         virtual = binop(Iop_Add64, virtual,
                                    IRExpr_Get(OFFB_FS_CONST, Ity_I64));
      } else {
         unimplemented("amd64 %fs segment override");
      }
   }

   if (pfx & PFX_GS) {
      if (vbi->guest_amd64_assume_gs_is_const) {
         /* return virtual + guest_GS_CONST. */
         virtual = binop(Iop_Add64, virtual,
                                    IRExpr_Get(OFFB_GS_CONST, Ity_I64));
      } else {
         unimplemented("amd64 %gs segment override");
      }
   }

   /* cs, ds, es and ss are simply ignored in 64-bit mode. */

   /* --- address size override --- */
   if (haveASO(pfx))
      virtual = unop(Iop_32Uto64, unop(Iop_64to32, virtual));

   return virtual;
}

//.. {
//..    Int    sreg;
//..    IRType hWordTy;
//..    IRTemp ldt_ptr, gdt_ptr, seg_selector, r64;
//..
//..    if (sorb == 0)
//..       /* the common case - no override */
//..       return virtual;
//..
//..    switch (sorb) {
//..       case 0x3E: sreg = R_DS; break;
//..       case 0x26: sreg = R_ES; break;
//..       case 0x64: sreg = R_FS; break;
//..       case 0x65: sreg = R_GS; break;
//..       default: vpanic("handleAddrOverrides(x86,guest)");
//..    }
//..
//..    hWordTy = sizeof(HWord)==4 ? Ity_I32 : Ity_I64;
//..
//..    seg_selector = newTemp(Ity_I32);
//..    ldt_ptr      = newTemp(hWordTy);
//..    gdt_ptr      = newTemp(hWordTy);
//..    r64          = newTemp(Ity_I64);
//..
//..    assign( seg_selector, unop(Iop_16Uto32, getSReg(sreg)) );
//..    assign( ldt_ptr, IRExpr_Get( OFFB_LDT, hWordTy ));
//..    assign( gdt_ptr, IRExpr_Get( OFFB_GDT, hWordTy ));
//..
//..    /*
//..    Call this to do the translation and limit checks:
//..    ULong x86g_use_seg_selector ( HWord ldt, HWord gdt,
//..                                  UInt seg_selector, UInt virtual_addr )
//..    */
//..    assign(
//..       r64,
//..       mkIRExprCCall(
//..          Ity_I64,
//..          0/*regparms*/,
//..          "x86g_use_seg_selector",
//..          &x86g_use_seg_selector,
//..          mkIRExprVec_4( mkexpr(ldt_ptr), mkexpr(gdt_ptr),
//..                         mkexpr(seg_selector), virtual)
//..       )
//..    );
//..
//..    /* If the high 32 of the result are non-zero, there was a
//..       failure in address translation.  In which case, make a
//..       quick exit.
//..    */
//..    stmt(
//..       IRStmt_Exit(
//..          binop(Iop_CmpNE32, unop(Iop_64HIto32, mkexpr(r64)), mkU32(0)),
//..          Ijk_MapFail,
//..          IRConst_U32( guest_eip_curr_instr )
//..       )
//..    );
//..
//..    /* otherwise, here's the translated result. */
//..    return unop(Iop_64to32, mkexpr(r64));
//.. }


/* Generate IR to calculate an address indicated by a ModRM and
   following SIB bytes.  The expression, and the number of bytes in
   the address mode, are returned (the latter in *len).  Note that
   this fn should not be called if the R/M part of the address denotes
   a register instead of memory.  If print_codegen is true, text of
   the addressing mode is placed in buf.

   The computed address is stored in a new tempreg, and the
   identity of the tempreg is returned.

   extra_bytes holds the number of bytes after the amode, as supplied
   by the caller.  This is needed to make sense of %rip-relative
   addresses.  Note that the value that *len is set to is only the
   length of the amode itself and does not include the value supplied
   in extra_bytes.
 */

static IRTemp disAMode_copy2tmp ( IRExpr* addr64 )
{
   IRTemp tmp = newTemp(Ity_I64);
   assign( tmp, addr64 );
   return tmp;
}

static
IRTemp disAMode ( /*OUT*/Int* len,
                  const VexAbiInfo* vbi, Prefix pfx, Long delta,
                  /*OUT*/HChar* buf, Int extra_bytes )
{
   UChar mod_reg_rm = getUChar(delta);
   delta++;

   buf[0] = (UChar)0;
   vassert(extra_bytes >= 0 && extra_bytes < 10);

   /* squeeze out the reg field from mod_reg_rm, since a 256-entry
      jump table seems a bit excessive.
   */
   mod_reg_rm &= 0xC7;                         /* is now XX000YYY */
   mod_reg_rm  = toUChar(mod_reg_rm | (mod_reg_rm >> 3));
                                               /* is now XX0XXYYY */
   mod_reg_rm &= 0x1F;                         /* is now 000XXYYY */
   switch (mod_reg_rm) {

      /* REX.B==0: (%rax) .. (%rdi), not including (%rsp) or (%rbp).
         REX.B==1: (%r8)  .. (%r15), not including (%r12) or (%r13).
      */
      case 0x00: case 0x01: case 0x02: case 0x03:
      /* ! 04 */ /* ! 05 */ case 0x06: case 0x07:
         { UChar rm = toUChar(mod_reg_rm & 7);
           DIS(buf, "%s(%s)", segRegTxt(pfx), nameIRegRexB(8,pfx,rm));
           *len = 1;
           return disAMode_copy2tmp(
                  handleAddrOverrides(vbi, pfx, getIRegRexB(8,pfx,rm)));
         }

      /* REX.B==0: d8(%rax) ... d8(%rdi), not including d8(%rsp)
         REX.B==1: d8(%r8)  ... d8(%r15), not including d8(%r12)
      */
      case 0x08: case 0x09: case 0x0A: case 0x0B:
      /* ! 0C */ case 0x0D: case 0x0E: case 0x0F:
         { UChar rm = toUChar(mod_reg_rm & 7);
           Long d   = getSDisp8(delta);
           if (d == 0) {
              DIS(buf, "%s(%s)", segRegTxt(pfx), nameIRegRexB(8,pfx,rm));
           } else {
              DIS(buf, "%s%lld(%s)", segRegTxt(pfx), d, nameIRegRexB(8,pfx,rm));
           }
           *len = 2;
           return disAMode_copy2tmp(
                  handleAddrOverrides(vbi, pfx,
                     binop(Iop_Add64,getIRegRexB(8,pfx,rm),mkU64(d))));
         }

      /* REX.B==0: d32(%rax) ... d32(%rdi), not including d32(%rsp)
         REX.B==1: d32(%r8)  ... d32(%r15), not including d32(%r12)
      */
      case 0x10: case 0x11: case 0x12: case 0x13:
      /* ! 14 */ case 0x15: case 0x16: case 0x17:
         { UChar rm = toUChar(mod_reg_rm & 7);
           Long  d  = getSDisp32(delta);
           DIS(buf, "%s%lld(%s)", segRegTxt(pfx), d, nameIRegRexB(8,pfx,rm));
           *len = 5;
           return disAMode_copy2tmp(
                  handleAddrOverrides(vbi, pfx,
                     binop(Iop_Add64,getIRegRexB(8,pfx,rm),mkU64(d))));
         }

      /* REX.B==0: a register, %rax .. %rdi.  This shouldn't happen. */
      /* REX.B==1: a register, %r8  .. %r16.  This shouldn't happen. */
      case 0x18: case 0x19: case 0x1A: case 0x1B:
      case 0x1C: case 0x1D: case 0x1E: case 0x1F:
         vpanic("disAMode(amd64): not an addr!");

      /* RIP + disp32.  This assumes that guest_RIP_curr_instr is set
         correctly at the start of handling each instruction. */
      case 0x05:
         { Long d = getSDisp32(delta);
           *len = 5;
           DIS(buf, "%s%lld(%%rip)", segRegTxt(pfx), d);
           /* We need to know the next instruction's start address.
              Try and figure out what it is, record the guess, and ask
              the top-level driver logic (bbToIR_AMD64) to check we
              guessed right, after the instruction is completely
              decoded. */
           guest_RIP_next_mustcheck = True;
           guest_RIP_next_assumed = guest_RIP_bbstart
                                    + delta+4 + extra_bytes;
           return disAMode_copy2tmp(
                     handleAddrOverrides(vbi, pfx,
                        binop(Iop_Add64, mkU64(guest_RIP_next_assumed),
                                         mkU64(d))));
         }

      case 0x04: {
         /* SIB, with no displacement.  Special cases:
            -- %rsp cannot act as an index value.
               If index_r indicates %rsp, zero is used for the index.
            -- when mod is zero and base indicates RBP or R13, base is
               instead a 32-bit sign-extended literal.
            It's all madness, I tell you.  Extract %index, %base and
            scale from the SIB byte.  The value denoted is then:
               | %index == %RSP && (%base == %RBP || %base == %R13)
               = d32 following SIB byte
               | %index == %RSP && !(%base == %RBP || %base == %R13)
               = %base
               | %index != %RSP && (%base == %RBP || %base == %R13)
               = d32 following SIB byte + (%index << scale)
               | %index != %RSP && !(%base == %RBP || %base == %R13)
               = %base + (%index << scale)
         */
         UChar sib     = getUChar(delta);
         UChar scale   = toUChar((sib >> 6) & 3);
         UChar index_r = toUChar((sib >> 3) & 7);
         UChar base_r  = toUChar(sib & 7);
         /* correct since #(R13) == 8 + #(RBP) */
         Bool  base_is_BPor13 = toBool(base_r == R_RBP);
         Bool  index_is_SP    = toBool(index_r == R_RSP && 0==getRexX(pfx));
         delta++;

         if ((!index_is_SP) && (!base_is_BPor13)) {
            if (scale == 0) {
               DIS(buf, "%s(%s,%s)", segRegTxt(pfx),
                         nameIRegRexB(8,pfx,base_r),
                         nameIReg64rexX(pfx,index_r));
            } else {
               DIS(buf, "%s(%s,%s,%d)", segRegTxt(pfx),
                         nameIRegRexB(8,pfx,base_r),
                         nameIReg64rexX(pfx,index_r), 1<<scale);
            }
            *len = 2;
            return
               disAMode_copy2tmp(
               handleAddrOverrides(vbi, pfx,
                  binop(Iop_Add64,
                        getIRegRexB(8,pfx,base_r),
                        binop(Iop_Shl64, getIReg64rexX(pfx,index_r),
                              mkU8(scale)))));
         }

         if ((!index_is_SP) && base_is_BPor13) {
            Long d = getSDisp32(delta);
            DIS(buf, "%s%lld(,%s,%d)", segRegTxt(pfx), d,
                      nameIReg64rexX(pfx,index_r), 1<<scale);
            *len = 6;
            return
               disAMode_copy2tmp(
               handleAddrOverrides(vbi, pfx,
                  binop(Iop_Add64,
                        binop(Iop_Shl64, getIReg64rexX(pfx,index_r),
                                         mkU8(scale)),
                        mkU64(d))));
         }

         if (index_is_SP && (!base_is_BPor13)) {
            DIS(buf, "%s(%s)", segRegTxt(pfx), nameIRegRexB(8,pfx,base_r));
            *len = 2;
            return disAMode_copy2tmp(
                   handleAddrOverrides(vbi, pfx, getIRegRexB(8,pfx,base_r)));
         }

         if (index_is_SP && base_is_BPor13) {
            Long d = getSDisp32(delta);
            DIS(buf, "%s%lld", segRegTxt(pfx), d);
            *len = 6;
            return disAMode_copy2tmp(
                   handleAddrOverrides(vbi, pfx, mkU64(d)));
         }

         vassert(0);
      }

      /* SIB, with 8-bit displacement.  Special cases:
         -- %esp cannot act as an index value.
            If index_r indicates %esp, zero is used for the index.
         Denoted value is:
            | %index == %ESP
            = d8 + %base
            | %index != %ESP
            = d8 + %base + (%index << scale)
      */
      case 0x0C: {
         UChar sib     = getUChar(delta);
         UChar scale   = toUChar((sib >> 6) & 3);
         UChar index_r = toUChar((sib >> 3) & 7);
         UChar base_r  = toUChar(sib & 7);
         Long d        = getSDisp8(delta+1);

         if (index_r == R_RSP && 0==getRexX(pfx)) {
            DIS(buf, "%s%lld(%s)", segRegTxt(pfx),
                                   d, nameIRegRexB(8,pfx,base_r));
            *len = 3;
            return disAMode_copy2tmp(
                   handleAddrOverrides(vbi, pfx,
                      binop(Iop_Add64, getIRegRexB(8,pfx,base_r), mkU64(d)) ));
         } else {
            if (scale == 0) {
               DIS(buf, "%s%lld(%s,%s)", segRegTxt(pfx), d,
                         nameIRegRexB(8,pfx,base_r),
                         nameIReg64rexX(pfx,index_r));
            } else {
               DIS(buf, "%s%lld(%s,%s,%d)", segRegTxt(pfx), d,
                         nameIRegRexB(8,pfx,base_r),
                         nameIReg64rexX(pfx,index_r), 1<<scale);
            }
            *len = 3;
            return
                disAMode_copy2tmp(
                handleAddrOverrides(vbi, pfx,
                  binop(Iop_Add64,
                        binop(Iop_Add64,
                              getIRegRexB(8,pfx,base_r),
                              binop(Iop_Shl64,
                                    getIReg64rexX(pfx,index_r), mkU8(scale))),
                        mkU64(d))));
         }
         vassert(0); /*NOTREACHED*/
      }

      /* SIB, with 32-bit displacement.  Special cases:
         -- %rsp cannot act as an index value.
            If index_r indicates %rsp, zero is used for the index.
         Denoted value is:
            | %index == %RSP
            = d32 + %base
            | %index != %RSP
            = d32 + %base + (%index << scale)
      */
      case 0x14: {
         UChar sib     = getUChar(delta);
         UChar scale   = toUChar((sib >> 6) & 3);
         UChar index_r = toUChar((sib >> 3) & 7);
         UChar base_r  = toUChar(sib & 7);
         Long d        = getSDisp32(delta+1);

         if (index_r == R_RSP && 0==getRexX(pfx)) {
            DIS(buf, "%s%lld(%s)", segRegTxt(pfx),
                                   d, nameIRegRexB(8,pfx,base_r));
            *len = 6;
            return disAMode_copy2tmp(
                   handleAddrOverrides(vbi, pfx,
                      binop(Iop_Add64, getIRegRexB(8,pfx,base_r), mkU64(d)) ));
         } else {
            if (scale == 0) {
               DIS(buf, "%s%lld(%s,%s)", segRegTxt(pfx), d,
                         nameIRegRexB(8,pfx,base_r),
                         nameIReg64rexX(pfx,index_r));
            } else {
               DIS(buf, "%s%lld(%s,%s,%d)", segRegTxt(pfx), d,
                         nameIRegRexB(8,pfx,base_r),
                         nameIReg64rexX(pfx,index_r), 1<<scale);
            }
            *len = 6;
            return
                disAMode_copy2tmp(
                handleAddrOverrides(vbi, pfx,
                  binop(Iop_Add64,
                        binop(Iop_Add64,
                              getIRegRexB(8,pfx,base_r),
                              binop(Iop_Shl64,
                                    getIReg64rexX(pfx,index_r), mkU8(scale))),
                        mkU64(d))));
         }
         vassert(0); /*NOTREACHED*/
      }

      default:
         vpanic("disAMode(amd64)");
         return 0; /*notreached*/
   }
}


/* Similarly for VSIB addressing.  This returns just the addend,
   and fills in *rI and *vscale with the register number of the vector
   index and its multiplicand.  */
static
IRTemp disAVSIBMode ( /*OUT*/Int* len,
                      const VexAbiInfo* vbi, Prefix pfx, Long delta,
                      /*OUT*/HChar* buf, /*OUT*/UInt* rI,
                      IRType ty, /*OUT*/Int* vscale )
{
   UChar mod_reg_rm = getUChar(delta);
   const HChar *vindex;

   *len = 0;
   *rI = 0;
   *vscale = 0;
   buf[0] = (UChar)0;
   if ((mod_reg_rm & 7) != 4 || epartIsReg(mod_reg_rm))
      return IRTemp_INVALID;

   UChar sib     = getUChar(delta+1);
   UChar scale   = toUChar((sib >> 6) & 3);
   UChar index_r = toUChar((sib >> 3) & 7);
   UChar base_r  = toUChar(sib & 7);
   Long  d       = 0;
   /* correct since #(R13) == 8 + #(RBP) */
   Bool  base_is_BPor13 = toBool(base_r == R_RBP);
   delta += 2;
   *len = 2;

   *rI = index_r | (getRexX(pfx) << 3);
   if (ty == Ity_V128)
      vindex = nameXMMReg(*rI);
   else
      vindex = nameYMMReg(*rI);
   *vscale = 1<<scale;

   switch (mod_reg_rm >> 6) {
   case 0:
      if (base_is_BPor13) {
         d = getSDisp32(delta);
         *len += 4;
         if (scale == 0) {
            DIS(buf, "%s%lld(,%s)", segRegTxt(pfx), d, vindex);
         } else {
            DIS(buf, "%s%lld(,%s,%d)", segRegTxt(pfx), d, vindex, 1<<scale);
         }
         return disAMode_copy2tmp( mkU64(d) );
      } else {
         if (scale == 0) {
            DIS(buf, "%s(%s,%s)", segRegTxt(pfx),
                     nameIRegRexB(8,pfx,base_r), vindex);
         } else {
            DIS(buf, "%s(%s,%s,%d)", segRegTxt(pfx),
                     nameIRegRexB(8,pfx,base_r), vindex, 1<<scale);
         }
      }
      break;
   case 1:
      d = getSDisp8(delta);
      *len += 1;
      goto have_disp;
   case 2:
      d = getSDisp32(delta);
      *len += 4;
   have_disp:
      if (scale == 0) {
         DIS(buf, "%s%lld(%s,%s)", segRegTxt(pfx), d,
                  nameIRegRexB(8,pfx,base_r), vindex);
      } else {
         DIS(buf, "%s%lld(%s,%s,%d)", segRegTxt(pfx), d,
                  nameIRegRexB(8,pfx,base_r), vindex, 1<<scale);
      }
      break;
   }

   if (!d)
      return disAMode_copy2tmp( getIRegRexB(8,pfx,base_r) );
   return disAMode_copy2tmp( binop(Iop_Add64, getIRegRexB(8,pfx,base_r),
                                   mkU64(d)) );
}


/* Figure out the number of (insn-stream) bytes constituting the amode
   beginning at delta.  Is useful for getting hold of literals beyond
   the end of the amode before it has been disassembled.  */

static UInt lengthAMode ( Prefix pfx, Long delta )
{
   UChar mod_reg_rm = getUChar(delta);
   delta++;

   /* squeeze out the reg field from mod_reg_rm, since a 256-entry
      jump table seems a bit excessive.
   */
   mod_reg_rm &= 0xC7;                         /* is now XX000YYY */
   mod_reg_rm  = toUChar(mod_reg_rm | (mod_reg_rm >> 3));
                                               /* is now XX0XXYYY */
   mod_reg_rm &= 0x1F;                         /* is now 000XXYYY */
   switch (mod_reg_rm) {

      /* REX.B==0: (%rax) .. (%rdi), not including (%rsp) or (%rbp).
         REX.B==1: (%r8)  .. (%r15), not including (%r12) or (%r13).
      */
      case 0x00: case 0x01: case 0x02: case 0x03:
      /* ! 04 */ /* ! 05 */ case 0x06: case 0x07:
         return 1;

      /* REX.B==0: d8(%rax) ... d8(%rdi), not including d8(%rsp)
         REX.B==1: d8(%r8)  ... d8(%r15), not including d8(%r12)
      */
      case 0x08: case 0x09: case 0x0A: case 0x0B:
      /* ! 0C */ case 0x0D: case 0x0E: case 0x0F:
         return 2;

      /* REX.B==0: d32(%rax) ... d32(%rdi), not including d32(%rsp)
         REX.B==1: d32(%r8)  ... d32(%r15), not including d32(%r12)
      */
      case 0x10: case 0x11: case 0x12: case 0x13:
      /* ! 14 */ case 0x15: case 0x16: case 0x17:
         return 5;

      /* REX.B==0: a register, %rax .. %rdi.  This shouldn't happen. */
      /* REX.B==1: a register, %r8  .. %r16.  This shouldn't happen. */
      /* Not an address, but still handled. */
      case 0x18: case 0x19: case 0x1A: case 0x1B:
      case 0x1C: case 0x1D: case 0x1E: case 0x1F:
         return 1;

      /* RIP + disp32. */
      case 0x05:
         return 5;

      case 0x04: {
         /* SIB, with no displacement. */
         UChar sib     = getUChar(delta);
         UChar base_r  = toUChar(sib & 7);
         /* correct since #(R13) == 8 + #(RBP) */
         Bool  base_is_BPor13 = toBool(base_r == R_RBP);

         if (base_is_BPor13) {
            return 6;
         } else {
            return 2;
         }
      }

      /* SIB, with 8-bit displacement. */
      case 0x0C:
         return 3;

      /* SIB, with 32-bit displacement. */
      case 0x14:
         return 6;

      default:
         vpanic("lengthAMode(amd64)");
         return 0; /*notreached*/
   }
}


/*------------------------------------------------------------*/
/*--- Disassembling common idioms                          ---*/
/*------------------------------------------------------------*/

/* Handle binary integer instructions of the form
      op E, G  meaning
      op reg-or-mem, reg
   Is passed the a ptr to the modRM byte, the actual operation, and the
   data size.  Returns the address advanced completely over this
   instruction.

   E(src) is reg-or-mem
   G(dst) is reg.

   If E is reg, -->    GET %G,  tmp
                       OP %E,   tmp
                       PUT tmp, %G

   If E is mem and OP is not reversible,
                -->    (getAddr E) -> tmpa
                       LD (tmpa), tmpa
                       GET %G, tmp2
                       OP tmpa, tmp2
                       PUT tmp2, %G

   If E is mem and OP is reversible
                -->    (getAddr E) -> tmpa
                       LD (tmpa), tmpa
                       OP %G, tmpa
                       PUT tmpa, %G
*/
static
ULong dis_op2_E_G ( const VexAbiInfo* vbi,
                    Prefix      pfx,
                    Bool        addSubCarry,
                    IROp        op8,
                    Bool        keep,
                    Int         size,
                    Long        delta0,
                    const HChar* t_amd64opc )
{
   HChar   dis_buf[50];
   Int     len;
   IRType  ty   = szToITy(size);
   IRTemp  dst1 = newTemp(ty);
   IRTemp  src  = newTemp(ty);
   IRTemp  dst0 = newTemp(ty);
   UChar   rm   = getUChar(delta0);
   IRTemp  addr = IRTemp_INVALID;

   /* addSubCarry == True indicates the intended operation is
      add-with-carry or subtract-with-borrow. */
   if (addSubCarry) {
      vassert(op8 == Iop_Add8 || op8 == Iop_Sub8);
      vassert(keep);
   }

   if (epartIsReg(rm)) {
      /* Specially handle XOR reg,reg, because that doesn't really
         depend on reg, and doing the obvious thing potentially
         generates a spurious value check failure due to the bogus
         dependency. */
      if ((op8 == Iop_Xor8 || (op8 == Iop_Sub8 && addSubCarry))
          && offsetIRegG(size,pfx,rm) == offsetIRegE(size,pfx,rm)) {
         if (False && op8 == Iop_Sub8)
            vex_printf("vex amd64->IR: sbb %%r,%%r optimisation(1)\n");
         putIRegG(size,pfx,rm, mkU(ty,0));
      }

      assign( dst0, getIRegG(size,pfx,rm) );
      assign( src,  getIRegE(size,pfx,rm) );

      if (addSubCarry && op8 == Iop_Add8) {
         helper_ADC( size, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
         putIRegG(size, pfx, rm, mkexpr(dst1));
      } else
      if (addSubCarry && op8 == Iop_Sub8) {
         helper_SBB( size, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
         putIRegG(size, pfx, rm, mkexpr(dst1));
      } else {
         assign( dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)) );
         if (isAddSub(op8))
            setFlags_DEP1_DEP2(op8, dst0, src, ty);
         else
            setFlags_DEP1(op8, dst1, ty);
         if (keep)
            putIRegG(size, pfx, rm, mkexpr(dst1));
      }

      DIP("%s%c %s,%s\n", t_amd64opc, nameISize(size),
                          nameIRegE(size,pfx,rm),
                          nameIRegG(size,pfx,rm));
      return 1+delta0;
   } else {
      /* E refers to memory */
      addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      assign( dst0, getIRegG(size,pfx,rm) );
      assign( src,  loadLE(szToITy(size), mkexpr(addr)) );

      if (addSubCarry && op8 == Iop_Add8) {
         helper_ADC( size, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
         putIRegG(size, pfx, rm, mkexpr(dst1));
      } else
      if (addSubCarry && op8 == Iop_Sub8) {
         helper_SBB( size, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
         putIRegG(size, pfx, rm, mkexpr(dst1));
      } else {
         assign( dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)) );
         if (isAddSub(op8))
            setFlags_DEP1_DEP2(op8, dst0, src, ty);
         else
            setFlags_DEP1(op8, dst1, ty);
         if (keep)
            putIRegG(size, pfx, rm, mkexpr(dst1));
      }

      DIP("%s%c %s,%s\n", t_amd64opc, nameISize(size),
                          dis_buf, nameIRegG(size, pfx, rm));
      return len+delta0;
   }
}



/* Handle binary integer instructions of the form
      op G, E  meaning
      op reg, reg-or-mem
   Is passed the a ptr to the modRM byte, the actual operation, and the
   data size.  Returns the address advanced completely over this
   instruction.

   G(src) is reg.
   E(dst) is reg-or-mem

   If E is reg, -->    GET %E,  tmp
                       OP %G,   tmp
                       PUT tmp, %E

   If E is mem, -->    (getAddr E) -> tmpa
                       LD (tmpa), tmpv
                       OP %G, tmpv
                       ST tmpv, (tmpa)
*/
static
ULong dis_op2_G_E ( const VexAbiInfo* vbi,
                    Prefix      pfx,
                    Bool        addSubCarry,
                    IROp        op8,
                    Bool        keep,
                    Int         size,
                    Long        delta0,
                    const HChar* t_amd64opc )
{
   HChar   dis_buf[50];
   Int     len;
   IRType  ty   = szToITy(size);
   IRTemp  dst1 = newTemp(ty);
   IRTemp  src  = newTemp(ty);
   IRTemp  dst0 = newTemp(ty);
   UChar   rm   = getUChar(delta0);
   IRTemp  addr = IRTemp_INVALID;

   /* addSubCarry == True indicates the intended operation is
      add-with-carry or subtract-with-borrow. */
   if (addSubCarry) {
      vassert(op8 == Iop_Add8 || op8 == Iop_Sub8);
      vassert(keep);
   }

   if (epartIsReg(rm)) {
      /* Specially handle XOR reg,reg, because that doesn't really
         depend on reg, and doing the obvious thing potentially
         generates a spurious value check failure due to the bogus
         dependency.  Ditto SBB reg,reg. */
      if ((op8 == Iop_Xor8 || (op8 == Iop_Sub8 && addSubCarry))
          && offsetIRegG(size,pfx,rm) == offsetIRegE(size,pfx,rm)) {
         putIRegE(size,pfx,rm, mkU(ty,0));
      }

      assign(dst0, getIRegE(size,pfx,rm));
      assign(src,  getIRegG(size,pfx,rm));

      if (addSubCarry && op8 == Iop_Add8) {
         helper_ADC( size, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
         putIRegE(size, pfx, rm, mkexpr(dst1));
      } else
      if (addSubCarry && op8 == Iop_Sub8) {
         helper_SBB( size, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
         putIRegE(size, pfx, rm, mkexpr(dst1));
      } else {
         assign(dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)));
         if (isAddSub(op8))
            setFlags_DEP1_DEP2(op8, dst0, src, ty);
         else
            setFlags_DEP1(op8, dst1, ty);
         if (keep)
            putIRegE(size, pfx, rm, mkexpr(dst1));
      }

      DIP("%s%c %s,%s\n", t_amd64opc, nameISize(size),
                          nameIRegG(size,pfx,rm),
                          nameIRegE(size,pfx,rm));
      return 1+delta0;
   }

   /* E refers to memory */
   {
      addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      assign(dst0, loadLE(ty,mkexpr(addr)));
      assign(src,  getIRegG(size,pfx,rm));

      if (addSubCarry && op8 == Iop_Add8) {
         if (haveLOCK(pfx)) {
            /* cas-style store */
            helper_ADC( size, dst1, dst0, src,
                        /*store*/addr, dst0/*expVal*/, guest_RIP_curr_instr );
         } else {
            /* normal store */
            helper_ADC( size, dst1, dst0, src,
                        /*store*/addr, IRTemp_INVALID, 0 );
         }
      } else
      if (addSubCarry && op8 == Iop_Sub8) {
         if (haveLOCK(pfx)) {
            /* cas-style store */
            helper_SBB( size, dst1, dst0, src,
                        /*store*/addr, dst0/*expVal*/, guest_RIP_curr_instr );
         } else {
            /* normal store */
            helper_SBB( size, dst1, dst0, src,
                        /*store*/addr, IRTemp_INVALID, 0 );
         }
      } else {
         assign(dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)));
         if (keep) {
            if (haveLOCK(pfx)) {
               if (0) vex_printf("locked case\n" );
               casLE( mkexpr(addr),
                      mkexpr(dst0)/*expval*/,
                      mkexpr(dst1)/*newval*/, guest_RIP_curr_instr );
            } else {
               if (0) vex_printf("nonlocked case\n");
               storeLE(mkexpr(addr), mkexpr(dst1));
            }
         }
         if (isAddSub(op8))
            setFlags_DEP1_DEP2(op8, dst0, src, ty);
         else
            setFlags_DEP1(op8, dst1, ty);
      }

      DIP("%s%c %s,%s\n", t_amd64opc, nameISize(size),
                          nameIRegG(size,pfx,rm), dis_buf);
      return len+delta0;
   }
}


/* Handle move instructions of the form
      mov E, G  meaning
      mov reg-or-mem, reg
   Is passed the a ptr to the modRM byte, and the data size.  Returns
   the address advanced completely over this instruction.

   E(src) is reg-or-mem
   G(dst) is reg.

   If E is reg, -->    GET %E,  tmpv
                       PUT tmpv, %G

   If E is mem  -->    (getAddr E) -> tmpa
                       LD (tmpa), tmpb
                       PUT tmpb, %G
*/
static
ULong dis_mov_E_G ( const VexAbiInfo* vbi,
                    Prefix      pfx,
                    Int         size,
                    Long        delta0 )
{
   Int len;
   UChar rm = getUChar(delta0);
   HChar dis_buf[50];

   if (epartIsReg(rm)) {
      putIRegG(size, pfx, rm, getIRegE(size, pfx, rm));
      DIP("mov%c %s,%s\n", nameISize(size),
                           nameIRegE(size,pfx,rm),
                           nameIRegG(size,pfx,rm));
      return 1+delta0;
   }

   /* E refers to memory */
   {
      IRTemp addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      putIRegG(size, pfx, rm, loadLE(szToITy(size), mkexpr(addr)));
      DIP("mov%c %s,%s\n", nameISize(size),
                           dis_buf,
                           nameIRegG(size,pfx,rm));
      return delta0+len;
   }
}


/* Handle move instructions of the form
      mov G, E  meaning
      mov reg, reg-or-mem
   Is passed the a ptr to the modRM byte, and the data size.  Returns
   the address advanced completely over this instruction.
   We have to decide here whether F2 or F3 are acceptable.  F2 never is.

   G(src) is reg.
   E(dst) is reg-or-mem

   If E is reg, -->    GET %G,  tmp
                       PUT tmp, %E

   If E is mem, -->    (getAddr E) -> tmpa
                       GET %G, tmpv
                       ST tmpv, (tmpa)
*/
static
ULong dis_mov_G_E ( const VexAbiInfo*  vbi,
                    Prefix       pfx,
                    Int          size,
                    Long         delta0,
                    /*OUT*/Bool* ok )
{
   Int   len;
   UChar rm = getUChar(delta0);
   HChar dis_buf[50];

   *ok = True;

   if (epartIsReg(rm)) {
      if (haveF2orF3(pfx)) { *ok = False; return delta0; }
      putIRegE(size, pfx, rm, getIRegG(size, pfx, rm));
      DIP("mov%c %s,%s\n", nameISize(size),
                           nameIRegG(size,pfx,rm),
                           nameIRegE(size,pfx,rm));
      return 1+delta0;
   }

   /* E refers to memory */
   {
      if (haveF2(pfx)) { *ok = False; return delta0; }
      /* F3(XRELEASE) is acceptable, though. */
      IRTemp addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      storeLE( mkexpr(addr), getIRegG(size, pfx, rm) );
      DIP("mov%c %s,%s\n", nameISize(size),
                           nameIRegG(size,pfx,rm),
                           dis_buf);
      return len+delta0;
   }
}


/* op $immediate, AL/AX/EAX/RAX. */
static
ULong dis_op_imm_A ( Int    size,
                     Bool   carrying,
                     IROp   op8,
                     Bool   keep,
                     Long   delta,
                     const HChar* t_amd64opc )
{
   Int    size4 = imin(size,4);
   IRType ty    = szToITy(size);
   IRTemp dst0  = newTemp(ty);
   IRTemp src   = newTemp(ty);
   IRTemp dst1  = newTemp(ty);
   Long  lit    = getSDisp(size4,delta);
   assign(dst0, getIRegRAX(size));
   assign(src,  mkU(ty,lit & mkSizeMask(size)));

   if (isAddSub(op8) && !carrying) {
      assign(dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)) );
      setFlags_DEP1_DEP2(op8, dst0, src, ty);
   }
   else
   if (isLogic(op8)) {
      vassert(!carrying);
      assign(dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)) );
      setFlags_DEP1(op8, dst1, ty);
   }
   else
   if (op8 == Iop_Add8 && carrying) {
      helper_ADC( size, dst1, dst0, src,
                  /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
   }
   else
   if (op8 == Iop_Sub8 && carrying) {
      helper_SBB( size, dst1, dst0, src,
                  /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
   }
   else
      vpanic("dis_op_imm_A(amd64,guest)");

   if (keep)
      putIRegRAX(size, mkexpr(dst1));

   DIP("%s%c $%lld, %s\n", t_amd64opc, nameISize(size),
                           lit, nameIRegRAX(size));
   return delta+size4;
}


/* Sign- and Zero-extending moves. */
static
ULong dis_movx_E_G ( const VexAbiInfo* vbi,
                     Prefix pfx,
                     Long delta, Int szs, Int szd, Bool sign_extend )
{
   UChar rm = getUChar(delta);
   if (epartIsReg(rm)) {
      putIRegG(szd, pfx, rm,
                    doScalarWidening(
                       szs,szd,sign_extend,
                       getIRegE(szs,pfx,rm)));
      DIP("mov%c%c%c %s,%s\n", sign_extend ? 's' : 'z',
                               nameISize(szs),
                               nameISize(szd),
                               nameIRegE(szs,pfx,rm),
                               nameIRegG(szd,pfx,rm));
      return 1+delta;
   }

   /* E refers to memory */
   {
      Int    len;
      HChar  dis_buf[50];
      IRTemp addr = disAMode ( &len, vbi, pfx, delta, dis_buf, 0 );
      putIRegG(szd, pfx, rm,
                    doScalarWidening(
                       szs,szd,sign_extend,
                       loadLE(szToITy(szs),mkexpr(addr))));
      DIP("mov%c%c%c %s,%s\n", sign_extend ? 's' : 'z',
                               nameISize(szs),
                               nameISize(szd),
                               dis_buf,
                               nameIRegG(szd,pfx,rm));
      return len+delta;
   }
}


/* Generate code to divide ArchRegs RDX:RAX / EDX:EAX / DX:AX / AX by
   the 64 / 32 / 16 / 8 bit quantity in the given IRTemp.  */
static
void codegen_div ( Int sz, IRTemp t, Bool signed_divide )
{
   /* special-case the 64-bit case */
   if (sz == 8) {
      IROp   op     = signed_divide ? Iop_DivModS128to64
                                    : Iop_DivModU128to64;
      IRTemp src128 = newTemp(Ity_I128);
      IRTemp dst128 = newTemp(Ity_I128);
      assign( src128, binop(Iop_64HLto128,
                            getIReg64(R_RDX),
                            getIReg64(R_RAX)) );
      assign( dst128, binop(op, mkexpr(src128), mkexpr(t)) );
      putIReg64( R_RAX, unop(Iop_128to64,mkexpr(dst128)) );
      putIReg64( R_RDX, unop(Iop_128HIto64,mkexpr(dst128)) );
   } else {
      IROp   op    = signed_divide ? Iop_DivModS64to32
                                   : Iop_DivModU64to32;
      IRTemp src64 = newTemp(Ity_I64);
      IRTemp dst64 = newTemp(Ity_I64);
      switch (sz) {
      case 4:
         assign( src64,
                 binop(Iop_32HLto64, getIRegRDX(4), getIRegRAX(4)) );
         assign( dst64,
                 binop(op, mkexpr(src64), mkexpr(t)) );
         putIRegRAX( 4, unop(Iop_64to32,mkexpr(dst64)) );
         putIRegRDX( 4, unop(Iop_64HIto32,mkexpr(dst64)) );
         break;
      case 2: {
         IROp widen3264 = signed_divide ? Iop_32Sto64 : Iop_32Uto64;
         IROp widen1632 = signed_divide ? Iop_16Sto32 : Iop_16Uto32;
         assign( src64, unop(widen3264,
                             binop(Iop_16HLto32,
                                   getIRegRDX(2),
                                   getIRegRAX(2))) );
         assign( dst64, binop(op, mkexpr(src64), unop(widen1632,mkexpr(t))) );
         putIRegRAX( 2, unop(Iop_32to16,unop(Iop_64to32,mkexpr(dst64))) );
         putIRegRDX( 2, unop(Iop_32to16,unop(Iop_64HIto32,mkexpr(dst64))) );
         break;
      }
      case 1: {
         IROp widen3264 = signed_divide ? Iop_32Sto64 : Iop_32Uto64;
         IROp widen1632 = signed_divide ? Iop_16Sto32 : Iop_16Uto32;
         IROp widen816  = signed_divide ? Iop_8Sto16  : Iop_8Uto16;
         assign( src64, unop(widen3264,
                        unop(widen1632, getIRegRAX(2))) );
         assign( dst64,
                 binop(op, mkexpr(src64),
                           unop(widen1632, unop(widen816, mkexpr(t)))) );
         putIRegRAX( 1, unop(Iop_16to8,
                        unop(Iop_32to16,
                        unop(Iop_64to32,mkexpr(dst64)))) );
         putIRegAH( unop(Iop_16to8,
                    unop(Iop_32to16,
                    unop(Iop_64HIto32,mkexpr(dst64)))) );
         break;
      }
      default:
         vpanic("codegen_div(amd64)");
      }
   }
}

static
ULong dis_Grp1 ( const VexAbiInfo* vbi,
                 Prefix pfx,
                 Long delta, UChar modrm,
                 Int am_sz, Int d_sz, Int sz, Long d64 )
{
   Int     len;
   HChar   dis_buf[50];
   IRType  ty   = szToITy(sz);
   IRTemp  dst1 = newTemp(ty);
   IRTemp  src  = newTemp(ty);
   IRTemp  dst0 = newTemp(ty);
   IRTemp  addr = IRTemp_INVALID;
   IROp    op8  = Iop_INVALID;
   ULong   mask = mkSizeMask(sz);

   switch (gregLO3ofRM(modrm)) {
      case 0: op8 = Iop_Add8; break;  case 1: op8 = Iop_Or8;  break;
      case 2: break;  // ADC
      case 3: break;  // SBB
      case 4: op8 = Iop_And8; break;  case 5: op8 = Iop_Sub8; break;
      case 6: op8 = Iop_Xor8; break;  case 7: op8 = Iop_Sub8; break;
      /*NOTREACHED*/
      default: vpanic("dis_Grp1(amd64): unhandled case");
   }

   if (epartIsReg(modrm)) {
      vassert(am_sz == 1);

      assign(dst0, getIRegE(sz,pfx,modrm));
      assign(src,  mkU(ty,d64 & mask));

      if (gregLO3ofRM(modrm) == 2 /* ADC */) {
         helper_ADC( sz, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
      } else
      if (gregLO3ofRM(modrm) == 3 /* SBB */) {
         helper_SBB( sz, dst1, dst0, src,
                     /*no store*/IRTemp_INVALID, IRTemp_INVALID, 0 );
      } else {
         assign(dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)));
         if (isAddSub(op8))
            setFlags_DEP1_DEP2(op8, dst0, src, ty);
         else
            setFlags_DEP1(op8, dst1, ty);
      }

      if (gregLO3ofRM(modrm) < 7)
         putIRegE(sz, pfx, modrm, mkexpr(dst1));

      delta += (am_sz + d_sz);
      DIP("%s%c $%lld, %s\n",
          nameGrp1(gregLO3ofRM(modrm)), nameISize(sz), d64,
          nameIRegE(sz,pfx,modrm));
   } else {
      addr = disAMode ( &len, vbi, pfx, delta, dis_buf, /*xtra*/d_sz );

      assign(dst0, loadLE(ty,mkexpr(addr)));
      assign(src, mkU(ty,d64 & mask));

      if (gregLO3ofRM(modrm) == 2 /* ADC */) {
         if (haveLOCK(pfx)) {
            /* cas-style store */
            helper_ADC( sz, dst1, dst0, src,
                       /*store*/addr, dst0/*expVal*/, guest_RIP_curr_instr );
         } else {
            /* normal store */
            helper_ADC( sz, dst1, dst0, src,
                        /*store*/addr, IRTemp_INVALID, 0 );
         }
      } else
      if (gregLO3ofRM(modrm) == 3 /* SBB */) {
         if (haveLOCK(pfx)) {
            /* cas-style store */
            helper_SBB( sz, dst1, dst0, src,
                       /*store*/addr, dst0/*expVal*/, guest_RIP_curr_instr );
         } else {
            /* normal store */
            helper_SBB( sz, dst1, dst0, src,
                        /*store*/addr, IRTemp_INVALID, 0 );
         }
      } else {
         assign(dst1, binop(mkSizedOp(ty,op8), mkexpr(dst0), mkexpr(src)));
         if (gregLO3ofRM(modrm) < 7) {
            if (haveLOCK(pfx)) {
               casLE( mkexpr(addr), mkexpr(dst0)/*expVal*/,
                                    mkexpr(dst1)/*newVal*/,
                                    guest_RIP_curr_instr );
            } else {
               storeLE(mkexpr(addr), mkexpr(dst1));
            }
         }
         if (isAddSub(op8))
            setFlags_DEP1_DEP2(op8, dst0, src, ty);
         else
            setFlags_DEP1(op8, dst1, ty);
      }

      delta += (len+d_sz);
      DIP("%s%c $%lld, %s\n",
          nameGrp1(gregLO3ofRM(modrm)), nameISize(sz),
          d64, dis_buf);
   }
   return delta;
}


/* Group 2 extended opcodes.  shift_expr must be an 8-bit typed
   expression. */

static
ULong dis_Grp2 ( const VexAbiInfo* vbi,
                 Prefix pfx,
                 Long delta, UChar modrm,
                 Int am_sz, Int d_sz, Int sz, IRExpr* shift_expr,
                 const HChar* shift_expr_txt, Bool* decode_OK )
{
   /* delta on entry points at the modrm byte. */
   HChar  dis_buf[50];
   Int    len;
   Bool   isShift, isRotate, isRotateC;
   IRType ty    = szToITy(sz);
   IRTemp dst0  = newTemp(ty);
   IRTemp dst1  = newTemp(ty);
   IRTemp addr  = IRTemp_INVALID;

   *decode_OK = True;

   vassert(sz == 1 || sz == 2 || sz == 4 || sz == 8);

   /* Put value to shift/rotate in dst0. */
   if (epartIsReg(modrm)) {
      assign(dst0, getIRegE(sz, pfx, modrm));
      delta += (am_sz + d_sz);
   } else {
      addr = disAMode ( &len, vbi, pfx, delta, dis_buf, /*xtra*/d_sz );
      assign(dst0, loadLE(ty,mkexpr(addr)));
      delta += len + d_sz;
   }

   isShift = False;
   switch (gregLO3ofRM(modrm)) { case 4: case 5: case 6: case 7: isShift = True; }

   isRotate = False;
   switch (gregLO3ofRM(modrm)) { case 0: case 1: isRotate = True; }

   isRotateC = False;
   switch (gregLO3ofRM(modrm)) { case 2: case 3: isRotateC = True; }

   if (!isShift && !isRotate && !isRotateC) {
      /*NOTREACHED*/
      vpanic("dis_Grp2(Reg): unhandled case(amd64)");
   }

   if (isRotateC) {
      /* Call a helper; this insn is so ridiculous it does not deserve
         better.  One problem is, the helper has to calculate both the
         new value and the new flags.  This is more than 64 bits, and
         there is no way to return more than 64 bits from the helper.
         Hence the crude and obvious solution is to call it twice,
         using the sign of the sz field to indicate whether it is the
         value or rflags result we want.
      */
      Bool     left = toBool(gregLO3ofRM(modrm) == 2);
      IRExpr** argsVALUE;
      IRExpr** argsRFLAGS;

      IRTemp new_value  = newTemp(Ity_I64);
      IRTemp new_rflags = newTemp(Ity_I64);
      IRTemp old_rflags = newTemp(Ity_I64);

      assign( old_rflags, widenUto64(mk_amd64g_calculate_rflags_all()) );

      argsVALUE
         = mkIRExprVec_4( widenUto64(mkexpr(dst0)), /* thing to rotate */
                          widenUto64(shift_expr),   /* rotate amount */
                          mkexpr(old_rflags),
                          mkU64(sz) );
      assign( new_value,
                 mkIRExprCCall(
                    Ity_I64,
                    0/*regparm*/,
                    left ? "amd64g_calculate_RCL" : "amd64g_calculate_RCR",
                    left ? &amd64g_calculate_RCL  : &amd64g_calculate_RCR,
                    argsVALUE
                 )
            );

      argsRFLAGS
         = mkIRExprVec_4( widenUto64(mkexpr(dst0)), /* thing to rotate */
                          widenUto64(shift_expr),   /* rotate amount */
                          mkexpr(old_rflags),
                          mkU64(-sz) );
      assign( new_rflags,
                 mkIRExprCCall(
                    Ity_I64,
                    0/*regparm*/,
                    left ? "amd64g_calculate_RCL" : "amd64g_calculate_RCR",
                    left ? &amd64g_calculate_RCL  : &amd64g_calculate_RCR,
                    argsRFLAGS
                 )
            );

      assign( dst1, narrowTo(ty, mkexpr(new_value)) );
      stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
      stmt( IRStmt_Put( OFFB_CC_DEP1, mkexpr(new_rflags) ));
      stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
      stmt( IRStmt_Put( OFFB_CC_NDEP, mkU64(0) ));
   }

   else
   if (isShift) {

      IRTemp pre64     = newTemp(Ity_I64);
      IRTemp res64     = newTemp(Ity_I64);
      IRTemp res64ss   = newTemp(Ity_I64);
      IRTemp shift_amt = newTemp(Ity_I8);
      UChar  mask      = toUChar(sz==8 ? 63 : 31);
      IROp   op64;

      switch (gregLO3ofRM(modrm)) {
         case 4: op64 = Iop_Shl64; break;
         case 5: op64 = Iop_Shr64; break;
         case 6: op64 = Iop_Shl64; break;
         case 7: op64 = Iop_Sar64; break;
         /*NOTREACHED*/
         default: vpanic("dis_Grp2:shift"); break;
      }

      /* Widen the value to be shifted to 64 bits, do the shift, and
         narrow back down.  This seems surprisingly long-winded, but
         unfortunately the AMD semantics requires that 8/16/32-bit
         shifts give defined results for shift values all the way up
         to 32, and this seems the simplest way to do it.  It has the
         advantage that the only IR level shifts generated are of 64
         bit values, and the shift amount is guaranteed to be in the
         range 0 .. 63, thereby observing the IR semantics requiring
         all shift values to be in the range 0 .. 2^word_size-1.

         Therefore the shift amount is masked with 63 for 64-bit shifts
         and 31 for all others.
      */
      /* shift_amt = shift_expr & MASK, regardless of operation size */
      assign( shift_amt, binop(Iop_And8, shift_expr, mkU8(mask)) );

      /* suitably widen the value to be shifted to 64 bits. */
      assign( pre64, op64==Iop_Sar64 ? widenSto64(mkexpr(dst0))
                                     : widenUto64(mkexpr(dst0)) );

      /* res64 = pre64 `shift` shift_amt */
      assign( res64, binop(op64, mkexpr(pre64), mkexpr(shift_amt)) );

      /* res64ss = pre64 `shift` ((shift_amt - 1) & MASK) */
      assign( res64ss,
              binop(op64,
                    mkexpr(pre64),
                    binop(Iop_And8,
                          binop(Iop_Sub8,
                                mkexpr(shift_amt), mkU8(1)),
                          mkU8(mask))) );

      /* Build the flags thunk. */
      setFlags_DEP1_DEP2_shift(op64, res64, res64ss, ty, shift_amt);

      /* Narrow the result back down. */
      assign( dst1, narrowTo(ty, mkexpr(res64)) );

   } /* if (isShift) */

   else
   if (isRotate) {
      Int    ccOp      = ty==Ity_I8 ? 0 : (ty==Ity_I16 ? 1
                                        : (ty==Ity_I32 ? 2 : 3));
      Bool   left      = toBool(gregLO3ofRM(modrm) == 0);
      IRTemp rot_amt   = newTemp(Ity_I8);
      IRTemp rot_amt64 = newTemp(Ity_I8);
      IRTemp oldFlags  = newTemp(Ity_I64);
      UChar  mask      = toUChar(sz==8 ? 63 : 31);

      /* rot_amt = shift_expr & mask */
      /* By masking the rotate amount thusly, the IR-level Shl/Shr
         expressions never shift beyond the word size and thus remain
         well defined. */
      assign(rot_amt64, binop(Iop_And8, shift_expr, mkU8(mask)));

      if (ty == Ity_I64)
         assign(rot_amt, mkexpr(rot_amt64));
      else
         assign(rot_amt, binop(Iop_And8, mkexpr(rot_amt64), mkU8(8*sz-1)));

      if (left) {

         /* dst1 = (dst0 << rot_amt) | (dst0 >>u (wordsize-rot_amt)) */
         assign(dst1,
            binop( mkSizedOp(ty,Iop_Or8),
                   binop( mkSizedOp(ty,Iop_Shl8),
                          mkexpr(dst0),
                          mkexpr(rot_amt)
                   ),
                   binop( mkSizedOp(ty,Iop_Shr8),
                          mkexpr(dst0),
                          binop(Iop_Sub8,mkU8(8*sz), mkexpr(rot_amt))
                   )
            )
         );
         ccOp += AMD64G_CC_OP_ROLB;

      } else { /* right */

         /* dst1 = (dst0 >>u rot_amt) | (dst0 << (wordsize-rot_amt)) */
         assign(dst1,
            binop( mkSizedOp(ty,Iop_Or8),
                   binop( mkSizedOp(ty,Iop_Shr8),
                          mkexpr(dst0),
                          mkexpr(rot_amt)
                   ),
                   binop( mkSizedOp(ty,Iop_Shl8),
                          mkexpr(dst0),
                          binop(Iop_Sub8,mkU8(8*sz), mkexpr(rot_amt))
                   )
            )
         );
         ccOp += AMD64G_CC_OP_RORB;

      }

      /* dst1 now holds the rotated value.  Build flag thunk.  We
         need the resulting value for this, and the previous flags.
         Except don't set it if the rotate count is zero. */

      assign(oldFlags, mk_amd64g_calculate_rflags_all());

      /* rot_amt64 :: Ity_I8.  We need to convert it to I1. */
      IRTemp rot_amt64b = newTemp(Ity_I1);
      assign(rot_amt64b, binop(Iop_CmpNE8, mkexpr(rot_amt64), mkU8(0)) );

      /* CC_DEP1 is the rotated value.  CC_NDEP is flags before. */
      stmt( IRStmt_Put( OFFB_CC_OP,
                        IRExpr_ITE( mkexpr(rot_amt64b),
                                    mkU64(ccOp),
                                    IRExpr_Get(OFFB_CC_OP,Ity_I64) ) ));
      stmt( IRStmt_Put( OFFB_CC_DEP1,
                        IRExpr_ITE( mkexpr(rot_amt64b),
                                    widenUto64(mkexpr(dst1)),
                                    IRExpr_Get(OFFB_CC_DEP1,Ity_I64) ) ));
      stmt( IRStmt_Put( OFFB_CC_DEP2,
                        IRExpr_ITE( mkexpr(rot_amt64b),
                                    mkU64(0),
                                    IRExpr_Get(OFFB_CC_DEP2,Ity_I64) ) ));
      stmt( IRStmt_Put( OFFB_CC_NDEP,
                        IRExpr_ITE( mkexpr(rot_amt64b),
                                    mkexpr(oldFlags),
                                    IRExpr_Get(OFFB_CC_NDEP,Ity_I64) ) ));
   } /* if (isRotate) */

   /* Save result, and finish up. */
   if (epartIsReg(modrm)) {
      putIRegE(sz, pfx, modrm, mkexpr(dst1));
      if (vex_traceflags & VEX_TRACE_FE) {
         vex_printf("%s%c ",
                    nameGrp2(gregLO3ofRM(modrm)), nameISize(sz) );
         if (shift_expr_txt)
            vex_printf("%s", shift_expr_txt);
         else
            ppIRExpr(shift_expr);
         vex_printf(", %s\n", nameIRegE(sz,pfx,modrm));
      }
   } else {
      storeLE(mkexpr(addr), mkexpr(dst1));
      if (vex_traceflags & VEX_TRACE_FE) {
         vex_printf("%s%c ",
                    nameGrp2(gregLO3ofRM(modrm)), nameISize(sz) );
         if (shift_expr_txt)
            vex_printf("%s", shift_expr_txt);
         else
            ppIRExpr(shift_expr);
         vex_printf(", %s\n", dis_buf);
      }
   }
   return delta;
}


/* Group 8 extended opcodes (but BT/BTS/BTC/BTR only). */
static
ULong dis_Grp8_Imm ( const VexAbiInfo* vbi,
                     Prefix pfx,
                     Long delta, UChar modrm,
                     Int am_sz, Int sz, ULong src_val,
                     Bool* decode_OK )
{
   /* src_val denotes a d8.
      And delta on entry points at the modrm byte. */

   IRType ty     = szToITy(sz);
   IRTemp t2     = newTemp(Ity_I64);
   IRTemp t2m    = newTemp(Ity_I64);
   IRTemp t_addr = IRTemp_INVALID;
   HChar  dis_buf[50];
   ULong  mask;

   /* we're optimists :-) */
   *decode_OK = True;

   /* Check whether F2 or F3 are acceptable. */
   if (epartIsReg(modrm)) {
      /* F2 or F3 are not allowed in the register case. */
      if (haveF2orF3(pfx)) {
         *decode_OK = False;
         return delta;
     }
   } else {
      /* F2 or F3 (but not both) are allowable provided LOCK is also
         present. */
      if (haveF2orF3(pfx)) {
         if (haveF2andF3(pfx) || !haveLOCK(pfx)) {
            *decode_OK = False;
            return delta;
         }
      }
   }

   /* Limit src_val -- the bit offset -- to something within a word.
      The Intel docs say that literal offsets larger than a word are
      masked in this way. */
   switch (sz) {
      case 2:  src_val &= 15; break;
      case 4:  src_val &= 31; break;
      case 8:  src_val &= 63; break;
      default: *decode_OK = False; return delta;
   }

   /* Invent a mask suitable for the operation. */
   switch (gregLO3ofRM(modrm)) {
      case 4: /* BT */  mask = 0;                  break;
      case 5: /* BTS */ mask = 1ULL << src_val;    break;
      case 6: /* BTR */ mask = ~(1ULL << src_val); break;
      case 7: /* BTC */ mask = 1ULL << src_val;    break;
         /* If this needs to be extended, probably simplest to make a
            new function to handle the other cases (0 .. 3).  The
            Intel docs do however not indicate any use for 0 .. 3, so
            we don't expect this to happen. */
      default: *decode_OK = False; return delta;
   }

   /* Fetch the value to be tested and modified into t2, which is
      64-bits wide regardless of sz. */
   if (epartIsReg(modrm)) {
      vassert(am_sz == 1);
      assign( t2, widenUto64(getIRegE(sz, pfx, modrm)) );
      delta += (am_sz + 1);
      DIP("%s%c $0x%llx, %s\n", nameGrp8(gregLO3ofRM(modrm)),
                                nameISize(sz),
                                src_val, nameIRegE(sz,pfx,modrm));
   } else {
      Int len;
      t_addr = disAMode ( &len, vbi, pfx, delta, dis_buf, 1 );
      delta  += (len+1);
      assign( t2, widenUto64(loadLE(ty, mkexpr(t_addr))) );
      DIP("%s%c $0x%llx, %s\n", nameGrp8(gregLO3ofRM(modrm)),
                                nameISize(sz),
                                src_val, dis_buf);
   }

   /* Compute the new value into t2m, if non-BT. */
   switch (gregLO3ofRM(modrm)) {
      case 4: /* BT */
         break;
      case 5: /* BTS */
         assign( t2m, binop(Iop_Or64, mkU64(mask), mkexpr(t2)) );
         break;
      case 6: /* BTR */
         assign( t2m, binop(Iop_And64, mkU64(mask), mkexpr(t2)) );
         break;
      case 7: /* BTC */
         assign( t2m, binop(Iop_Xor64, mkU64(mask), mkexpr(t2)) );
         break;
     default:
         /*NOTREACHED*/ /*the previous switch guards this*/
         vassert(0);
   }

   /* Write the result back, if non-BT. */
   if (gregLO3ofRM(modrm) != 4 /* BT */) {
      if (epartIsReg(modrm)) {
        putIRegE(sz, pfx, modrm, narrowTo(ty, mkexpr(t2m)));
      } else {
         if (haveLOCK(pfx)) {
            casLE( mkexpr(t_addr),
                   narrowTo(ty, mkexpr(t2))/*expd*/,
                   narrowTo(ty, mkexpr(t2m))/*new*/,
                   guest_RIP_curr_instr );
         } else {
            storeLE(mkexpr(t_addr), narrowTo(ty, mkexpr(t2m)));
         }
      }
   }

   /* Copy relevant bit from t2 into the carry flag. */
   /* Flags: C=selected bit, O,S,Z,A,P undefined, so are set to zero. */
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
   stmt( IRStmt_Put(
            OFFB_CC_DEP1,
            binop(Iop_And64,
                  binop(Iop_Shr64, mkexpr(t2), mkU8(src_val)),
                  mkU64(1))
       ));
   /* Set NDEP even though it isn't used.  This makes redundant-PUT
      elimination of previous stores to this field work better. */
   stmt( IRStmt_Put( OFFB_CC_NDEP, mkU64(0) ));

   return delta;
}


/* Signed/unsigned widening multiply.  Generate IR to multiply the
   value in RAX/EAX/AX/AL by the given IRTemp, and park the result in
   RDX:RAX/EDX:EAX/DX:AX/AX.
*/
static void codegen_mulL_A_D ( Int sz, Bool syned,
                               IRTemp tmp, const HChar* tmp_txt )
{
   IRType ty = szToITy(sz);
   IRTemp t1 = newTemp(ty);

   assign( t1, getIRegRAX(sz) );

   switch (ty) {
      case Ity_I64: {
         IRTemp res128  = newTemp(Ity_I128);
         IRTemp resHi   = newTemp(Ity_I64);
         IRTemp resLo   = newTemp(Ity_I64);
         IROp   mulOp   = syned ? Iop_MullS64 : Iop_MullU64;
         UInt   tBaseOp = syned ? AMD64G_CC_OP_SMULB : AMD64G_CC_OP_UMULB;
         setFlags_MUL ( Ity_I64, t1, tmp, tBaseOp );
         assign( res128, binop(mulOp, mkexpr(t1), mkexpr(tmp)) );
         assign( resHi, unop(Iop_128HIto64,mkexpr(res128)));
         assign( resLo, unop(Iop_128to64,mkexpr(res128)));
         putIReg64(R_RDX, mkexpr(resHi));
         putIReg64(R_RAX, mkexpr(resLo));
         break;
      }
      case Ity_I32: {
         IRTemp res64   = newTemp(Ity_I64);
         IRTemp resHi   = newTemp(Ity_I32);
         IRTemp resLo   = newTemp(Ity_I32);
         IROp   mulOp   = syned ? Iop_MullS32 : Iop_MullU32;
         UInt   tBaseOp = syned ? AMD64G_CC_OP_SMULB : AMD64G_CC_OP_UMULB;
         setFlags_MUL ( Ity_I32, t1, tmp, tBaseOp );
         assign( res64, binop(mulOp, mkexpr(t1), mkexpr(tmp)) );
         assign( resHi, unop(Iop_64HIto32,mkexpr(res64)));
         assign( resLo, unop(Iop_64to32,mkexpr(res64)));
         putIRegRDX(4, mkexpr(resHi));
         putIRegRAX(4, mkexpr(resLo));
         break;
      }
      case Ity_I16: {
         IRTemp res32   = newTemp(Ity_I32);
         IRTemp resHi   = newTemp(Ity_I16);
         IRTemp resLo   = newTemp(Ity_I16);
         IROp   mulOp   = syned ? Iop_MullS16 : Iop_MullU16;
         UInt   tBaseOp = syned ? AMD64G_CC_OP_SMULB : AMD64G_CC_OP_UMULB;
         setFlags_MUL ( Ity_I16, t1, tmp, tBaseOp );
         assign( res32, binop(mulOp, mkexpr(t1), mkexpr(tmp)) );
         assign( resHi, unop(Iop_32HIto16,mkexpr(res32)));
         assign( resLo, unop(Iop_32to16,mkexpr(res32)));
         putIRegRDX(2, mkexpr(resHi));
         putIRegRAX(2, mkexpr(resLo));
         break;
      }
      case Ity_I8: {
         IRTemp res16   = newTemp(Ity_I16);
         IRTemp resHi   = newTemp(Ity_I8);
         IRTemp resLo   = newTemp(Ity_I8);
         IROp   mulOp   = syned ? Iop_MullS8 : Iop_MullU8;
         UInt   tBaseOp = syned ? AMD64G_CC_OP_SMULB : AMD64G_CC_OP_UMULB;
         setFlags_MUL ( Ity_I8, t1, tmp, tBaseOp );
         assign( res16, binop(mulOp, mkexpr(t1), mkexpr(tmp)) );
         assign( resHi, unop(Iop_16HIto8,mkexpr(res16)));
         assign( resLo, unop(Iop_16to8,mkexpr(res16)));
         putIRegRAX(2, mkexpr(res16));
         break;
      }
      default:
         ppIRType(ty);
         vpanic("codegen_mulL_A_D(amd64)");
   }
   DIP("%s%c %s\n", syned ? "imul" : "mul", nameISize(sz), tmp_txt);
}


/* Group 3 extended opcodes.  We have to decide here whether F2 and F3
   might be valid.*/
static
ULong dis_Grp3 ( const VexAbiInfo* vbi,
                 Prefix pfx, Int sz, Long delta, Bool* decode_OK )
{
   Long    d64;
   UChar   modrm;
   HChar   dis_buf[50];
   Int     len;
   IRTemp  addr;
   IRType  ty = szToITy(sz);
   IRTemp  t1 = newTemp(ty);
   IRTemp dst1, src, dst0;
   *decode_OK = True;
   modrm = getUChar(delta);
   if (epartIsReg(modrm)) {
      /* F2/XACQ and F3/XREL are always invalid in the non-mem case. */
      if (haveF2orF3(pfx)) goto unhandled;
      switch (gregLO3ofRM(modrm)) {
         case 0: { /* TEST */
            delta++;
            d64 = getSDisp(imin(4,sz), delta);
            delta += imin(4,sz);
            dst1 = newTemp(ty);
            assign(dst1, binop(mkSizedOp(ty,Iop_And8),
                               getIRegE(sz,pfx,modrm),
                               mkU(ty, d64 & mkSizeMask(sz))));
            setFlags_DEP1( Iop_And8, dst1, ty );
            DIP("test%c $%lld, %s\n",
                nameISize(sz), d64,
                nameIRegE(sz, pfx, modrm));
            break;
         }
         case 1:
            *decode_OK = False;
            return delta;
         case 2: /* NOT */
            delta++;
            putIRegE(sz, pfx, modrm,
                              unop(mkSizedOp(ty,Iop_Not8),
                                   getIRegE(sz, pfx, modrm)));
            DIP("not%c %s\n", nameISize(sz),
                              nameIRegE(sz, pfx, modrm));
            break;
         case 3: /* NEG */
            delta++;
            dst0 = newTemp(ty);
            src  = newTemp(ty);
            dst1 = newTemp(ty);
            assign(dst0, mkU(ty,0));
            assign(src,  getIRegE(sz, pfx, modrm));
            assign(dst1, binop(mkSizedOp(ty,Iop_Sub8), mkexpr(dst0),
                                                       mkexpr(src)));
            setFlags_DEP1_DEP2(Iop_Sub8, dst0, src, ty);
            putIRegE(sz, pfx, modrm, mkexpr(dst1));
            DIP("neg%c %s\n", nameISize(sz), nameIRegE(sz, pfx, modrm));
            break;
         case 4: /* MUL (unsigned widening) */
            delta++;
            src = newTemp(ty);
            assign(src, getIRegE(sz,pfx,modrm));
            codegen_mulL_A_D ( sz, False, src,
                               nameIRegE(sz,pfx,modrm) );
            break;
         case 5: /* IMUL (signed widening) */
            delta++;
            src = newTemp(ty);
            assign(src, getIRegE(sz,pfx,modrm));
            codegen_mulL_A_D ( sz, True, src,
                               nameIRegE(sz,pfx,modrm) );
            break;
         case 6: /* DIV */
            delta++;
            assign( t1, getIRegE(sz, pfx, modrm) );
            codegen_div ( sz, t1, False );
            DIP("div%c %s\n", nameISize(sz),
                              nameIRegE(sz, pfx, modrm));
            break;
         case 7: /* IDIV */
            delta++;
            assign( t1, getIRegE(sz, pfx, modrm) );
            codegen_div ( sz, t1, True );
            DIP("idiv%c %s\n", nameISize(sz),
                               nameIRegE(sz, pfx, modrm));
            break;
         default:
            /*NOTREACHED*/
            vpanic("Grp3(amd64,R)");
      }
   } else {
      /* Decide if F2/XACQ or F3/XREL might be valid. */
      Bool validF2orF3 = haveF2orF3(pfx) ? False : True;
      if ((gregLO3ofRM(modrm) == 3/*NEG*/ || gregLO3ofRM(modrm) == 2/*NOT*/)
          && haveF2orF3(pfx) && !haveF2andF3(pfx) && haveLOCK(pfx)) {
         validF2orF3 = True;
      }
      if (!validF2orF3) goto unhandled;
      /* */
      addr = disAMode ( &len, vbi, pfx, delta, dis_buf,
                        /* we have to inform disAMode of any immediate
                           bytes used */
                        gregLO3ofRM(modrm)==0/*TEST*/
                           ? imin(4,sz)
                           : 0
                      );
      t1   = newTemp(ty);
      delta += len;
      assign(t1, loadLE(ty,mkexpr(addr)));
      switch (gregLO3ofRM(modrm)) {
         case 0: { /* TEST */
            d64 = getSDisp(imin(4,sz), delta);
            delta += imin(4,sz);
            dst1 = newTemp(ty);
            assign(dst1, binop(mkSizedOp(ty,Iop_And8),
                               mkexpr(t1),
                               mkU(ty, d64 & mkSizeMask(sz))));
            setFlags_DEP1( Iop_And8, dst1, ty );
            DIP("test%c $%lld, %s\n", nameISize(sz), d64, dis_buf);
            break;
         }
         case 1:
            *decode_OK = False;
            return delta;
         case 2: /* NOT */
            dst1 = newTemp(ty);
            assign(dst1, unop(mkSizedOp(ty,Iop_Not8), mkexpr(t1)));
            if (haveLOCK(pfx)) {
               casLE( mkexpr(addr), mkexpr(t1)/*expd*/, mkexpr(dst1)/*new*/,
                                    guest_RIP_curr_instr );
            } else {
               storeLE( mkexpr(addr), mkexpr(dst1) );
            }
            DIP("not%c %s\n", nameISize(sz), dis_buf);
            break;
         case 3: /* NEG */
            dst0 = newTemp(ty);
            src  = newTemp(ty);
            dst1 = newTemp(ty);
            assign(dst0, mkU(ty,0));
            assign(src,  mkexpr(t1));
            assign(dst1, binop(mkSizedOp(ty,Iop_Sub8), mkexpr(dst0),
                                                       mkexpr(src)));
            if (haveLOCK(pfx)) {
               casLE( mkexpr(addr), mkexpr(t1)/*expd*/, mkexpr(dst1)/*new*/,
                                    guest_RIP_curr_instr );
            } else {
               storeLE( mkexpr(addr), mkexpr(dst1) );
            }
            setFlags_DEP1_DEP2(Iop_Sub8, dst0, src, ty);
            DIP("neg%c %s\n", nameISize(sz), dis_buf);
            break;
         case 4: /* MUL (unsigned widening) */
            codegen_mulL_A_D ( sz, False, t1, dis_buf );
            break;
         case 5: /* IMUL */
            codegen_mulL_A_D ( sz, True, t1, dis_buf );
            break;
         case 6: /* DIV */
            codegen_div ( sz, t1, False );
            DIP("div%c %s\n", nameISize(sz), dis_buf);
            break;
         case 7: /* IDIV */
            codegen_div ( sz, t1, True );
            DIP("idiv%c %s\n", nameISize(sz), dis_buf);
            break;
         default:
            /*NOTREACHED*/
            vpanic("Grp3(amd64,M)");
      }
   }
   return delta;
  unhandled:
   *decode_OK = False;
   return delta;
}


/* Group 4 extended opcodes.  We have to decide here whether F2 and F3
   might be valid. */
static
ULong dis_Grp4 ( const VexAbiInfo* vbi,
                 Prefix pfx, Long delta, Bool* decode_OK )
{
   Int   alen;
   UChar modrm;
   HChar dis_buf[50];
   IRType ty = Ity_I8;
   IRTemp t1 = newTemp(ty);
   IRTemp t2 = newTemp(ty);

   *decode_OK = True;

   modrm = getUChar(delta);
   if (epartIsReg(modrm)) {
      /* F2/XACQ and F3/XREL are always invalid in the non-mem case. */
      if (haveF2orF3(pfx)) goto unhandled;
      assign(t1, getIRegE(1, pfx, modrm));
      switch (gregLO3ofRM(modrm)) {
         case 0: /* INC */
            assign(t2, binop(Iop_Add8, mkexpr(t1), mkU8(1)));
            putIRegE(1, pfx, modrm, mkexpr(t2));
            setFlags_INC_DEC( True, t2, ty );
            break;
         case 1: /* DEC */
            assign(t2, binop(Iop_Sub8, mkexpr(t1), mkU8(1)));
            putIRegE(1, pfx, modrm, mkexpr(t2));
            setFlags_INC_DEC( False, t2, ty );
            break;
         default:
            *decode_OK = False;
            return delta;
      }
      delta++;
      DIP("%sb %s\n", nameGrp4(gregLO3ofRM(modrm)),
                      nameIRegE(1, pfx, modrm));
   } else {
      /* Decide if F2/XACQ or F3/XREL might be valid. */
      Bool validF2orF3 = haveF2orF3(pfx) ? False : True;
      if ((gregLO3ofRM(modrm) == 0/*INC*/ || gregLO3ofRM(modrm) == 1/*DEC*/)
          && haveF2orF3(pfx) && !haveF2andF3(pfx) && haveLOCK(pfx)) {
         validF2orF3 = True;
      }
      if (!validF2orF3) goto unhandled;
      /* */
      IRTemp addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( t1, loadLE(ty, mkexpr(addr)) );
      switch (gregLO3ofRM(modrm)) {
         case 0: /* INC */
            assign(t2, binop(Iop_Add8, mkexpr(t1), mkU8(1)));
            if (haveLOCK(pfx)) {
               casLE( mkexpr(addr), mkexpr(t1)/*expd*/, mkexpr(t2)/*new*/,
                      guest_RIP_curr_instr );
            } else {
               storeLE( mkexpr(addr), mkexpr(t2) );
            }
            setFlags_INC_DEC( True, t2, ty );
            break;
         case 1: /* DEC */
            assign(t2, binop(Iop_Sub8, mkexpr(t1), mkU8(1)));
            if (haveLOCK(pfx)) {
               casLE( mkexpr(addr), mkexpr(t1)/*expd*/, mkexpr(t2)/*new*/,
                      guest_RIP_curr_instr );
            } else {
               storeLE( mkexpr(addr), mkexpr(t2) );
            }
            setFlags_INC_DEC( False, t2, ty );
            break;
         default:
            *decode_OK = False;
            return delta;
      }
      delta += alen;
      DIP("%sb %s\n", nameGrp4(gregLO3ofRM(modrm)), dis_buf);
   }
   return delta;
  unhandled:
   *decode_OK = False;
   return delta;
}


/* Group 5 extended opcodes.  We have to decide here whether F2 and F3
   might be valid. */
static
ULong dis_Grp5 ( const VexAbiInfo* vbi,
                 Prefix pfx, Int sz, Long delta,
                 /*MOD*/DisResult* dres, /*OUT*/Bool* decode_OK )
{
   Int     len;
   UChar   modrm;
   HChar   dis_buf[50];
   IRTemp  addr = IRTemp_INVALID;
   IRType  ty = szToITy(sz);
   IRTemp  t1 = newTemp(ty);
   IRTemp  t2 = IRTemp_INVALID;
   IRTemp  t3 = IRTemp_INVALID;
   Bool    showSz = True;

   *decode_OK = True;

   modrm = getUChar(delta);
   if (epartIsReg(modrm)) {
      /* F2/XACQ and F3/XREL are always invalid in the non-mem case.
         F2/CALL and F2/JMP may have bnd prefix. */
     if (haveF2orF3(pfx)
         && ! (haveF2(pfx)
               && (gregLO3ofRM(modrm) == 2 || gregLO3ofRM(modrm) == 4)))
        goto unhandledR;
      assign(t1, getIRegE(sz,pfx,modrm));
      switch (gregLO3ofRM(modrm)) {
         case 0: /* INC */
            t2 = newTemp(ty);
            assign(t2, binop(mkSizedOp(ty,Iop_Add8),
                             mkexpr(t1), mkU(ty,1)));
            setFlags_INC_DEC( True, t2, ty );
            putIRegE(sz,pfx,modrm, mkexpr(t2));
            break;
         case 1: /* DEC */
            t2 = newTemp(ty);
            assign(t2, binop(mkSizedOp(ty,Iop_Sub8),
                             mkexpr(t1), mkU(ty,1)));
            setFlags_INC_DEC( False, t2, ty );
            putIRegE(sz,pfx,modrm, mkexpr(t2));
            break;
         case 2: /* call Ev */
            /* Ignore any sz value and operate as if sz==8. */
            if (!(sz == 4 || sz == 8)) goto unhandledR;
            if (haveF2(pfx)) DIP("bnd ; "); /* MPX bnd prefix. */
            sz = 8;
            t3 = newTemp(Ity_I64);
            assign(t3, getIRegE(sz,pfx,modrm));
            t2 = newTemp(Ity_I64);
            assign(t2, binop(Iop_Sub64, getIReg64(R_RSP), mkU64(8)));
            putIReg64(R_RSP, mkexpr(t2));
            storeLE( mkexpr(t2), mkU64(guest_RIP_bbstart+delta+1));
            make_redzone_AbiHint(vbi, t2, t3/*nia*/, "call-Ev(reg)");
            jmp_treg(dres, Ijk_Call, t3);
            vassert(dres->whatNext == Dis_StopHere);
            showSz = False;
            break;
         case 4: /* jmp Ev */
            /* Ignore any sz value and operate as if sz==8. */
            if (!(sz == 4 || sz == 8)) goto unhandledR;
            if (haveF2(pfx)) DIP("bnd ; "); /* MPX bnd prefix. */
            sz = 8;
            t3 = newTemp(Ity_I64);
            assign(t3, getIRegE(sz,pfx,modrm));
            jmp_treg(dres, Ijk_Boring, t3);
            vassert(dres->whatNext == Dis_StopHere);
            showSz = False;
            break;
         case 6: /* PUSH Ev */
            /* There is no encoding for 32-bit operand size; hence ... */
            if (sz == 4) sz = 8;
            if (sz == 8 || sz == 2) {
               ty = szToITy(sz); /* redo it, since sz might have changed */
               t3 = newTemp(ty);
               assign(t3, getIRegE(sz,pfx,modrm));
               t2 = newTemp(Ity_I64);
               assign( t2, binop(Iop_Sub64,getIReg64(R_RSP),mkU64(sz)) );
               putIReg64(R_RSP, mkexpr(t2) );
               storeLE( mkexpr(t2), mkexpr(t3) );
               break;
            } else {
               goto unhandledR; /* awaiting test case */
            }
         default:
         unhandledR:
            *decode_OK = False;
            return delta;
      }
      delta++;
      DIP("%s%c %s\n", nameGrp5(gregLO3ofRM(modrm)),
                       showSz ? nameISize(sz) : ' ',
                       nameIRegE(sz, pfx, modrm));
   } else {
      /* Decide if F2/XACQ, F3/XREL, F2/CALL or F2/JMP might be valid. */
      Bool validF2orF3 = haveF2orF3(pfx) ? False : True;
      if ((gregLO3ofRM(modrm) == 0/*INC*/ || gregLO3ofRM(modrm) == 1/*DEC*/)
          && haveF2orF3(pfx) && !haveF2andF3(pfx) && haveLOCK(pfx)) {
         validF2orF3 = True;
      } else if ((gregLO3ofRM(modrm) == 2 || gregLO3ofRM(modrm) == 4)
                 && (haveF2(pfx) && !haveF3(pfx))) {
         validF2orF3 = True;
      }
      if (!validF2orF3) goto unhandledM;
      /* */
      addr = disAMode ( &len, vbi, pfx, delta, dis_buf, 0 );
      if (gregLO3ofRM(modrm) != 2 && gregLO3ofRM(modrm) != 4
                                  && gregLO3ofRM(modrm) != 6) {
         assign(t1, loadLE(ty,mkexpr(addr)));
      }
      switch (gregLO3ofRM(modrm)) {
         case 0: /* INC */
            t2 = newTemp(ty);
            assign(t2, binop(mkSizedOp(ty,Iop_Add8),
                             mkexpr(t1), mkU(ty,1)));
            if (haveLOCK(pfx)) {
               casLE( mkexpr(addr),
                      mkexpr(t1), mkexpr(t2), guest_RIP_curr_instr );
            } else {
               storeLE(mkexpr(addr),mkexpr(t2));
            }
            setFlags_INC_DEC( True, t2, ty );
            break;
         case 1: /* DEC */
            t2 = newTemp(ty);
            assign(t2, binop(mkSizedOp(ty,Iop_Sub8),
                             mkexpr(t1), mkU(ty,1)));
            if (haveLOCK(pfx)) {
               casLE( mkexpr(addr),
                      mkexpr(t1), mkexpr(t2), guest_RIP_curr_instr );
            } else {
               storeLE(mkexpr(addr),mkexpr(t2));
            }
            setFlags_INC_DEC( False, t2, ty );
            break;
         case 2: /* call Ev */
            /* Ignore any sz value and operate as if sz==8. */
            if (!(sz == 4 || sz == 8)) goto unhandledM;
            if (haveF2(pfx)) DIP("bnd ; "); /* MPX bnd prefix. */
            sz = 8;
            t3 = newTemp(Ity_I64);
            assign(t3, loadLE(Ity_I64,mkexpr(addr)));
            t2 = newTemp(Ity_I64);
            assign(t2, binop(Iop_Sub64, getIReg64(R_RSP), mkU64(8)));
            putIReg64(R_RSP, mkexpr(t2));
            storeLE( mkexpr(t2), mkU64(guest_RIP_bbstart+delta+len));
            make_redzone_AbiHint(vbi, t2, t3/*nia*/, "call-Ev(mem)");
            jmp_treg(dres, Ijk_Call, t3);
            vassert(dres->whatNext == Dis_StopHere);
            showSz = False;
            break;
         case 4: /* JMP Ev */
            /* Ignore any sz value and operate as if sz==8. */
            if (!(sz == 4 || sz == 8)) goto unhandledM;
            if (haveF2(pfx)) DIP("bnd ; "); /* MPX bnd prefix. */
            sz = 8;
            t3 = newTemp(Ity_I64);
            assign(t3, loadLE(Ity_I64,mkexpr(addr)));
            jmp_treg(dres, Ijk_Boring, t3);
            vassert(dres->whatNext == Dis_StopHere);
            showSz = False;
            break;
         case 6: /* PUSH Ev */
            /* There is no encoding for 32-bit operand size; hence ... */
            if (sz == 4) sz = 8;
            if (sz == 8 || sz == 2) {
               ty = szToITy(sz); /* redo it, since sz might have changed */
               t3 = newTemp(ty);
               assign(t3, loadLE(ty,mkexpr(addr)));
               t2 = newTemp(Ity_I64);
               assign( t2, binop(Iop_Sub64,getIReg64(R_RSP),mkU64(sz)) );
               putIReg64(R_RSP, mkexpr(t2) );
               storeLE( mkexpr(t2), mkexpr(t3) );
               break;
            } else {
               goto unhandledM; /* awaiting test case */
            }
         default:
         unhandledM:
            *decode_OK = False;
            return delta;
      }
      delta += len;
      DIP("%s%c %s\n", nameGrp5(gregLO3ofRM(modrm)),
                       showSz ? nameISize(sz) : ' ',
                       dis_buf);
   }
   return delta;
}


/*------------------------------------------------------------*/
/*--- Disassembling string ops (including REP prefixes)    ---*/
/*------------------------------------------------------------*/

/* Code shared by all the string ops */
static
void dis_string_op_increment ( Int sz, IRTemp t_inc )
{
   UChar logSz;
   if (sz == 8 || sz == 4 || sz == 2) {
      logSz = 1;
      if (sz == 4) logSz = 2;
      if (sz == 8) logSz = 3;
      assign( t_inc,
              binop(Iop_Shl64, IRExpr_Get( OFFB_DFLAG, Ity_I64 ),
                               mkU8(logSz) ) );
   } else {
      assign( t_inc,
              IRExpr_Get( OFFB_DFLAG, Ity_I64 ) );
   }
}

static
void dis_string_op( void (*dis_OP)( Int, IRTemp, Prefix pfx ),
                    Int sz, const HChar* name, Prefix pfx )
{
   IRTemp t_inc = newTemp(Ity_I64);
   /* Really we ought to inspect the override prefixes, but we don't.
      The following assertion catches any resulting sillyness. */
   vassert(pfx == clearSegBits(pfx));
   dis_string_op_increment(sz, t_inc);
   dis_OP( sz, t_inc, pfx );
   DIP("%s%c\n", name, nameISize(sz));
}

static
void dis_MOVS ( Int sz, IRTemp t_inc, Prefix pfx )
{
   IRType ty = szToITy(sz);
   IRTemp td = newTemp(Ity_I64);   /* RDI */
   IRTemp ts = newTemp(Ity_I64);   /* RSI */
   IRExpr *incd, *incs;

   if (haveASO(pfx)) {
      assign( td, unop(Iop_32Uto64, getIReg32(R_RDI)) );
      assign( ts, unop(Iop_32Uto64, getIReg32(R_RSI)) );
   } else {
      assign( td, getIReg64(R_RDI) );
      assign( ts, getIReg64(R_RSI) );
   }

   storeLE( mkexpr(td), loadLE(ty,mkexpr(ts)) );

   incd = binop(Iop_Add64, mkexpr(td), mkexpr(t_inc));
   incs = binop(Iop_Add64, mkexpr(ts), mkexpr(t_inc));
   if (haveASO(pfx)) {
      incd = unop(Iop_32Uto64, unop(Iop_64to32, incd));
      incs = unop(Iop_32Uto64, unop(Iop_64to32, incs));
   }
   putIReg64( R_RDI, incd );
   putIReg64( R_RSI, incs );
}

static
void dis_LODS ( Int sz, IRTemp t_inc, Prefix pfx )
{
   IRType ty = szToITy(sz);
   IRTemp ts = newTemp(Ity_I64);   /* RSI */
   IRExpr *incs;

   if (haveASO(pfx))
      assign( ts, unop(Iop_32Uto64, getIReg32(R_RSI)) );
   else
      assign( ts, getIReg64(R_RSI) );

   putIRegRAX ( sz, loadLE(ty, mkexpr(ts)) );

   incs = binop(Iop_Add64, mkexpr(ts), mkexpr(t_inc));
   if (haveASO(pfx))
      incs = unop(Iop_32Uto64, unop(Iop_64to32, incs));
   putIReg64( R_RSI, incs );
}

static
void dis_STOS ( Int sz, IRTemp t_inc, Prefix pfx )
{
   IRType ty = szToITy(sz);
   IRTemp ta = newTemp(ty);        /* rAX */
   IRTemp td = newTemp(Ity_I64);   /* RDI */
   IRExpr *incd;

   assign( ta, getIRegRAX(sz) );

   if (haveASO(pfx))
      assign( td, unop(Iop_32Uto64, getIReg32(R_RDI)) );
   else
      assign( td, getIReg64(R_RDI) );

   storeLE( mkexpr(td), mkexpr(ta) );

   incd = binop(Iop_Add64, mkexpr(td), mkexpr(t_inc));
   if (haveASO(pfx))
      incd = unop(Iop_32Uto64, unop(Iop_64to32, incd));
   putIReg64( R_RDI, incd );
}

static
void dis_CMPS ( Int sz, IRTemp t_inc, Prefix pfx )
{
   IRType ty  = szToITy(sz);
   IRTemp tdv = newTemp(ty);      /* (RDI) */
   IRTemp tsv = newTemp(ty);      /* (RSI) */
   IRTemp td  = newTemp(Ity_I64); /*  RDI  */
   IRTemp ts  = newTemp(Ity_I64); /*  RSI  */
   IRExpr *incd, *incs;

   if (haveASO(pfx)) {
      assign( td, unop(Iop_32Uto64, getIReg32(R_RDI)) );
      assign( ts, unop(Iop_32Uto64, getIReg32(R_RSI)) );
   } else {
      assign( td, getIReg64(R_RDI) );
      assign( ts, getIReg64(R_RSI) );
   }

   assign( tdv, loadLE(ty,mkexpr(td)) );

   assign( tsv, loadLE(ty,mkexpr(ts)) );

   setFlags_DEP1_DEP2 ( Iop_Sub8, tsv, tdv, ty );

   incd = binop(Iop_Add64, mkexpr(td), mkexpr(t_inc));
   incs = binop(Iop_Add64, mkexpr(ts), mkexpr(t_inc));
   if (haveASO(pfx)) {
      incd = unop(Iop_32Uto64, unop(Iop_64to32, incd));
      incs = unop(Iop_32Uto64, unop(Iop_64to32, incs));
   }
   putIReg64( R_RDI, incd );
   putIReg64( R_RSI, incs );
}

static
void dis_SCAS ( Int sz, IRTemp t_inc, Prefix pfx )
{
   IRType ty  = szToITy(sz);
   IRTemp ta  = newTemp(ty);       /*  rAX  */
   IRTemp td  = newTemp(Ity_I64);  /*  RDI  */
   IRTemp tdv = newTemp(ty);       /* (RDI) */
   IRExpr *incd;

   assign( ta, getIRegRAX(sz) );

   if (haveASO(pfx))
      assign( td, unop(Iop_32Uto64, getIReg32(R_RDI)) );
   else
      assign( td, getIReg64(R_RDI) );

   assign( tdv, loadLE(ty,mkexpr(td)) );

   setFlags_DEP1_DEP2 ( Iop_Sub8, ta, tdv, ty );

   incd = binop(Iop_Add64, mkexpr(td), mkexpr(t_inc));
   if (haveASO(pfx))
      incd = unop(Iop_32Uto64, unop(Iop_64to32, incd));
   putIReg64( R_RDI, incd );
}


/* Wrap the appropriate string op inside a REP/REPE/REPNE.  We assume
   the insn is the last one in the basic block, and so emit a jump to
   the next insn, rather than just falling through. */
static
void dis_REP_op ( /*MOD*/DisResult* dres,
                  AMD64Condcode cond,
                  void (*dis_OP)(Int, IRTemp, Prefix),
                  Int sz, Addr64 rip, Addr64 rip_next, const HChar* name,
                  Prefix pfx )
{
   IRTemp t_inc = newTemp(Ity_I64);
   IRTemp tc;
   IRExpr* cmp;

   /* Really we ought to inspect the override prefixes, but we don't.
      The following assertion catches any resulting sillyness. */
   vassert(pfx == clearSegBits(pfx));

   if (haveASO(pfx)) {
      tc = newTemp(Ity_I32);  /*  ECX  */
      assign( tc, getIReg32(R_RCX) );
      cmp = binop(Iop_CmpEQ32, mkexpr(tc), mkU32(0));
   } else {
      tc = newTemp(Ity_I64);  /*  RCX  */
      assign( tc, getIReg64(R_RCX) );
      cmp = binop(Iop_CmpEQ64, mkexpr(tc), mkU64(0));
   }

   stmt( IRStmt_Exit( cmp, Ijk_Boring,
                      IRConst_U64(rip_next), OFFB_RIP ) );

   if (haveASO(pfx))
      putIReg32(R_RCX, binop(Iop_Sub32, mkexpr(tc), mkU32(1)) );
  else
      putIReg64(R_RCX, binop(Iop_Sub64, mkexpr(tc), mkU64(1)) );

   dis_string_op_increment(sz, t_inc);
   dis_OP (sz, t_inc, pfx);

   if (cond == AMD64CondAlways) {
      jmp_lit(dres, Ijk_Boring, rip);
      vassert(dres->whatNext == Dis_StopHere);
   } else {
      stmt( IRStmt_Exit( mk_amd64g_calculate_condition(cond),
                         Ijk_Boring,
                         IRConst_U64(rip),
                         OFFB_RIP ) );
      jmp_lit(dres, Ijk_Boring, rip_next);
      vassert(dres->whatNext == Dis_StopHere);
   }
   DIP("%s%c\n", name, nameISize(sz));
}


/*------------------------------------------------------------*/
/*--- Arithmetic, etc.                                     ---*/
/*------------------------------------------------------------*/

/* IMUL E, G.  Supplied eip points to the modR/M byte. */
static
ULong dis_mul_E_G ( const VexAbiInfo* vbi,
                    Prefix      pfx,
                    Int         size,
                    Long        delta0 )
{
   Int    alen;
   HChar  dis_buf[50];
   UChar  rm = getUChar(delta0);
   IRType ty = szToITy(size);
   IRTemp te = newTemp(ty);
   IRTemp tg = newTemp(ty);
   IRTemp resLo = newTemp(ty);

   assign( tg, getIRegG(size, pfx, rm) );
   if (epartIsReg(rm)) {
      assign( te, getIRegE(size, pfx, rm) );
   } else {
      IRTemp addr = disAMode( &alen, vbi, pfx, delta0, dis_buf, 0 );
      assign( te, loadLE(ty,mkexpr(addr)) );
   }

   setFlags_MUL ( ty, te, tg, AMD64G_CC_OP_SMULB );

   assign( resLo, binop( mkSizedOp(ty, Iop_Mul8), mkexpr(te), mkexpr(tg) ) );

   putIRegG(size, pfx, rm, mkexpr(resLo) );

   if (epartIsReg(rm)) {
      DIP("imul%c %s, %s\n", nameISize(size),
                             nameIRegE(size,pfx,rm),
                             nameIRegG(size,pfx,rm));
      return 1+delta0;
   } else {
      DIP("imul%c %s, %s\n", nameISize(size),
                             dis_buf,
                             nameIRegG(size,pfx,rm));
      return alen+delta0;
   }
}


/* IMUL I * E -> G.  Supplied rip points to the modR/M byte. */
static
ULong dis_imul_I_E_G ( const VexAbiInfo* vbi,
                       Prefix      pfx,
                       Int         size,
                       Long        delta,
                       Int         litsize )
{
   Long   d64;
   Int    alen;
   HChar  dis_buf[50];
   UChar  rm = getUChar(delta);
   IRType ty = szToITy(size);
   IRTemp te = newTemp(ty);
   IRTemp tl = newTemp(ty);
   IRTemp resLo = newTemp(ty);

   vassert(/*size == 1 ||*/ size == 2 || size == 4 || size == 8);

   if (epartIsReg(rm)) {
      assign(te, getIRegE(size, pfx, rm));
      delta++;
   } else {
      IRTemp addr = disAMode( &alen, vbi, pfx, delta, dis_buf,
                                     imin(4,litsize) );
      assign(te, loadLE(ty, mkexpr(addr)));
      delta += alen;
   }
   d64 = getSDisp(imin(4,litsize),delta);
   delta += imin(4,litsize);

   d64 &= mkSizeMask(size);
   assign(tl, mkU(ty,d64));

   assign( resLo, binop( mkSizedOp(ty, Iop_Mul8), mkexpr(te), mkexpr(tl) ));

   setFlags_MUL ( ty, te, tl, AMD64G_CC_OP_SMULB );

   putIRegG(size, pfx, rm, mkexpr(resLo));

   DIP("imul%c $%lld, %s, %s\n",
       nameISize(size), d64,
       ( epartIsReg(rm) ? nameIRegE(size,pfx,rm) : dis_buf ),
       nameIRegG(size,pfx,rm) );
   return delta;
}


/* Generate an IR sequence to do a popcount operation on the supplied
   IRTemp, and return a new IRTemp holding the result.  'ty' may be
   Ity_I16, Ity_I32 or Ity_I64 only. */
static IRTemp gen_POPCOUNT ( IRType ty, IRTemp src )
{
   Int i;
   if (ty == Ity_I16) {
      IRTemp old = IRTemp_INVALID;
      IRTemp nyu = IRTemp_INVALID;
      IRTemp mask[4], shift[4];
      for (i = 0; i < 4; i++) {
         mask[i]  = newTemp(ty);
         shift[i] = 1 << i;
      }
      assign(mask[0], mkU16(0x5555));
      assign(mask[1], mkU16(0x3333));
      assign(mask[2], mkU16(0x0F0F));
      assign(mask[3], mkU16(0x00FF));
      old = src;
      for (i = 0; i < 4; i++) {
         nyu = newTemp(ty);
         assign(nyu,
                binop(Iop_Add16,
                      binop(Iop_And16,
                            mkexpr(old),
                            mkexpr(mask[i])),
                      binop(Iop_And16,
                            binop(Iop_Shr16, mkexpr(old), mkU8(shift[i])),
                            mkexpr(mask[i]))));
         old = nyu;
      }
      return nyu;
   }
   if (ty == Ity_I32) {
      IRTemp old = IRTemp_INVALID;
      IRTemp nyu = IRTemp_INVALID;
      IRTemp mask[5], shift[5];
      for (i = 0; i < 5; i++) {
         mask[i]  = newTemp(ty);
         shift[i] = 1 << i;
      }
      assign(mask[0], mkU32(0x55555555));
      assign(mask[1], mkU32(0x33333333));
      assign(mask[2], mkU32(0x0F0F0F0F));
      assign(mask[3], mkU32(0x00FF00FF));
      assign(mask[4], mkU32(0x0000FFFF));
      old = src;
      for (i = 0; i < 5; i++) {
         nyu = newTemp(ty);
         assign(nyu,
                binop(Iop_Add32,
                      binop(Iop_And32,
                            mkexpr(old),
                            mkexpr(mask[i])),
                      binop(Iop_And32,
                            binop(Iop_Shr32, mkexpr(old), mkU8(shift[i])),
                            mkexpr(mask[i]))));
         old = nyu;
      }
      return nyu;
   }
   if (ty == Ity_I64) {
      IRTemp old = IRTemp_INVALID;
      IRTemp nyu = IRTemp_INVALID;
      IRTemp mask[6], shift[6];
      for (i = 0; i < 6; i++) {
         mask[i]  = newTemp(ty);
         shift[i] = 1 << i;
      }
      assign(mask[0], mkU64(0x5555555555555555ULL));
      assign(mask[1], mkU64(0x3333333333333333ULL));
      assign(mask[2], mkU64(0x0F0F0F0F0F0F0F0FULL));
      assign(mask[3], mkU64(0x00FF00FF00FF00FFULL));
      assign(mask[4], mkU64(0x0000FFFF0000FFFFULL));
      assign(mask[5], mkU64(0x00000000FFFFFFFFULL));
      old = src;
      for (i = 0; i < 6; i++) {
         nyu = newTemp(ty);
         assign(nyu,
                binop(Iop_Add64,
                      binop(Iop_And64,
                            mkexpr(old),
                            mkexpr(mask[i])),
                      binop(Iop_And64,
                            binop(Iop_Shr64, mkexpr(old), mkU8(shift[i])),
                            mkexpr(mask[i]))));
         old = nyu;
      }
      return nyu;
   }
   /*NOTREACHED*/
   vassert(0);
}


/* Generate an IR sequence to do a count-leading-zeroes operation on
   the supplied IRTemp, and return a new IRTemp holding the result.
   'ty' may be Ity_I16, Ity_I32 or Ity_I64 only.  In the case where
   the argument is zero, return the number of bits in the word (the
   natural semantics). */
static IRTemp gen_LZCNT ( IRType ty, IRTemp src )
{
   vassert(ty == Ity_I64 || ty == Ity_I32 || ty == Ity_I16);

   IRTemp src64 = newTemp(Ity_I64);
   assign(src64, widenUto64( mkexpr(src) ));

   IRTemp src64x = newTemp(Ity_I64);
   assign(src64x,
          binop(Iop_Shl64, mkexpr(src64),
                           mkU8(64 - 8 * sizeofIRType(ty))));

   // Clz64 has undefined semantics when its input is zero, so
   // special-case around that.
   IRTemp res64 = newTemp(Ity_I64);
   assign(res64,
          IRExpr_ITE(
             binop(Iop_CmpEQ64, mkexpr(src64x), mkU64(0)),
             mkU64(8 * sizeofIRType(ty)),
             unop(Iop_Clz64, mkexpr(src64x))
   ));

   IRTemp res = newTemp(ty);
   assign(res, narrowTo(ty, mkexpr(res64)));
   return res;
}


/* Generate an IR sequence to do a count-trailing-zeroes operation on
   the supplied IRTemp, and return a new IRTemp holding the result.
   'ty' may be Ity_I16, Ity_I32 or Ity_I64 only.  In the case where
   the argument is zero, return the number of bits in the word (the
   natural semantics). */
static IRTemp gen_TZCNT ( IRType ty, IRTemp src )
{
   vassert(ty == Ity_I64 || ty == Ity_I32 || ty == Ity_I16);

   IRTemp src64 = newTemp(Ity_I64);
   assign(src64, widenUto64( mkexpr(src) ));

   // Ctz64 has undefined semantics when its input is zero, so
   // special-case around that.
   IRTemp res64 = newTemp(Ity_I64);
   assign(res64,
          IRExpr_ITE(
             binop(Iop_CmpEQ64, mkexpr(src64), mkU64(0)),
             mkU64(8 * sizeofIRType(ty)),
             unop(Iop_Ctz64, mkexpr(src64))
   ));

   IRTemp res = newTemp(ty);
   assign(res, narrowTo(ty, mkexpr(res64)));
   return res;
}


/*------------------------------------------------------------*/
/*---                                                      ---*/
/*--- x87 FLOATING POINT INSTRUCTIONS                      ---*/
/*---                                                      ---*/
/*------------------------------------------------------------*/

/* --- Helper functions for dealing with the register stack. --- */

/* --- Set the emulation-warning pseudo-register. --- */

static void put_emwarn ( IRExpr* e /* :: Ity_I32 */ )
{
   vassert(typeOfIRExpr(irsb->tyenv, e) == Ity_I32);
   stmt( IRStmt_Put( OFFB_EMNOTE, e ) );
}

/* --- Produce an IRExpr* denoting a 64-bit QNaN. --- */

static IRExpr* mkQNaN64 ( void )
{
  /* QNaN is 0 2047 1 0(51times)
     == 0b 11111111111b 1 0(51times)
     == 0x7FF8 0000 0000 0000
   */
   return IRExpr_Const(IRConst_F64i(0x7FF8000000000000ULL));
}

/* --------- Get/put the top-of-stack pointer :: Ity_I32 --------- */

static IRExpr* get_ftop ( void )
{
   return IRExpr_Get( OFFB_FTOP, Ity_I32 );
}

static void put_ftop ( IRExpr* e )
{
   vassert(typeOfIRExpr(irsb->tyenv, e) == Ity_I32);
   stmt( IRStmt_Put( OFFB_FTOP, e ) );
}

/* --------- Get/put the C3210 bits. --------- */

static IRExpr*  /* :: Ity_I64 */ get_C3210 ( void )
{
   return IRExpr_Get( OFFB_FC3210, Ity_I64 );
}

static void put_C3210 ( IRExpr* e  /* :: Ity_I64 */ )
{
   vassert(typeOfIRExpr(irsb->tyenv, e) == Ity_I64);
   stmt( IRStmt_Put( OFFB_FC3210, e ) );
}

/* --------- Get/put the FPU rounding mode. --------- */
static IRExpr* /* :: Ity_I32 */ get_fpround ( void )
{
   return unop(Iop_64to32, IRExpr_Get( OFFB_FPROUND, Ity_I64 ));
}

static void put_fpround ( IRExpr* /* :: Ity_I32 */ e )
{
   vassert(typeOfIRExpr(irsb->tyenv, e) == Ity_I32);
   stmt( IRStmt_Put( OFFB_FPROUND, unop(Iop_32Uto64,e) ) );
}


/* --------- Synthesise a 2-bit FPU rounding mode. --------- */
/* Produces a value in 0 .. 3, which is encoded as per the type
   IRRoundingMode.  Since the guest_FPROUND value is also encoded as
   per IRRoundingMode, we merely need to get it and mask it for
   safety.
*/
static IRExpr* /* :: Ity_I32 */ get_roundingmode ( void )
{
   return binop( Iop_And32, get_fpround(), mkU32(3) );
}

static IRExpr* /* :: Ity_I32 */ get_FAKE_roundingmode ( void )
{
   return mkU32(Irrm_NEAREST);
}


/* --------- Get/set FP register tag bytes. --------- */

/* Given i, and some expression e, generate 'ST_TAG(i) = e'. */

static void put_ST_TAG ( Int i, IRExpr* value )
{
   IRRegArray* descr;
   vassert(typeOfIRExpr(irsb->tyenv, value) == Ity_I8);
   descr = mkIRRegArray( OFFB_FPTAGS, Ity_I8, 8 );
   stmt( IRStmt_PutI( mkIRPutI(descr, get_ftop(), i, value) ) );
}

/* Given i, generate an expression yielding 'ST_TAG(i)'.  This will be
   zero to indicate "Empty" and nonzero to indicate "NonEmpty".  */

static IRExpr* get_ST_TAG ( Int i )
{
   IRRegArray* descr = mkIRRegArray( OFFB_FPTAGS, Ity_I8, 8 );
   return IRExpr_GetI( descr, get_ftop(), i );
}


/* --------- Get/set FP registers. --------- */

/* Given i, and some expression e, emit 'ST(i) = e' and set the
   register's tag to indicate the register is full.  The previous
   state of the register is not checked. */

static void put_ST_UNCHECKED ( Int i, IRExpr* value )
{
   IRRegArray* descr;
   vassert(typeOfIRExpr(irsb->tyenv, value) == Ity_F64);
   descr = mkIRRegArray( OFFB_FPREGS, Ity_F64, 8 );
   stmt( IRStmt_PutI( mkIRPutI(descr, get_ftop(), i, value) ) );
   /* Mark the register as in-use. */
   put_ST_TAG(i, mkU8(1));
}

/* Given i, and some expression e, emit
      ST(i) = is_full(i) ? NaN : e
   and set the tag accordingly.
*/

static void put_ST ( Int i, IRExpr* value )
{
   put_ST_UNCHECKED(
      i,
      IRExpr_ITE( binop(Iop_CmpNE8, get_ST_TAG(i), mkU8(0)),
                  /* non-0 means full */
                  mkQNaN64(),
                  /* 0 means empty */
                  value
      )
   );
}


/* Given i, generate an expression yielding 'ST(i)'. */

static IRExpr* get_ST_UNCHECKED ( Int i )
{
   IRRegArray* descr = mkIRRegArray( OFFB_FPREGS, Ity_F64, 8 );
   return IRExpr_GetI( descr, get_ftop(), i );
}


/* Given i, generate an expression yielding
  is_full(i) ? ST(i) : NaN
*/

static IRExpr* get_ST ( Int i )
{
   return
      IRExpr_ITE( binop(Iop_CmpNE8, get_ST_TAG(i), mkU8(0)),
                  /* non-0 means full */
                  get_ST_UNCHECKED(i),
                  /* 0 means empty */
                  mkQNaN64());
}


/* Given i, and some expression e, and a condition cond, generate IR
   which has the same effect as put_ST(i,e) when cond is true and has
   no effect when cond is false.  Given the lack of proper
   if-then-else in the IR, this is pretty tricky.
*/

static void maybe_put_ST ( IRTemp cond, Int i, IRExpr* value )
{
   // new_tag = if cond then FULL else old_tag
   // new_val = if cond then (if old_tag==FULL then NaN else val)
   //                   else old_val

   IRTemp old_tag = newTemp(Ity_I8);
   assign(old_tag, get_ST_TAG(i));
   IRTemp new_tag = newTemp(Ity_I8);
   assign(new_tag,
          IRExpr_ITE(mkexpr(cond), mkU8(1)/*FULL*/, mkexpr(old_tag)));

   IRTemp old_val = newTemp(Ity_F64);
   assign(old_val, get_ST_UNCHECKED(i));
   IRTemp new_val = newTemp(Ity_F64);
   assign(new_val,
          IRExpr_ITE(mkexpr(cond),
                     IRExpr_ITE(binop(Iop_CmpNE8, mkexpr(old_tag), mkU8(0)),
                                /* non-0 means full */
                                mkQNaN64(),
                                /* 0 means empty */
                                value),
                     mkexpr(old_val)));

   put_ST_UNCHECKED(i, mkexpr(new_val));
   // put_ST_UNCHECKED incorrectly sets tag(i) to always be FULL.  So
   // now set it to new_tag instead.
   put_ST_TAG(i, mkexpr(new_tag));
}

/* Adjust FTOP downwards by one register. */

static void fp_push ( void )
{
   put_ftop( binop(Iop_Sub32, get_ftop(), mkU32(1)) );
}

/* Adjust FTOP downwards by one register when COND is 1:I1.  Else
   don't change it. */

static void maybe_fp_push ( IRTemp cond )
{
   put_ftop( binop(Iop_Sub32, get_ftop(), unop(Iop_1Uto32,mkexpr(cond))) );
}

/* Adjust FTOP upwards by one register, and mark the vacated register
   as empty.  */

static void fp_pop ( void )
{
   put_ST_TAG(0, mkU8(0));
   put_ftop( binop(Iop_Add32, get_ftop(), mkU32(1)) );
}

/* Set the C2 bit of the FPU status register to e[0].  Assumes that
   e[31:1] == 0.
*/
static void set_C2 ( IRExpr* e )
{
   IRExpr* cleared = binop(Iop_And64, get_C3210(), mkU64(~AMD64G_FC_MASK_C2));
   put_C3210( binop(Iop_Or64,
                    cleared,
                    binop(Iop_Shl64, e, mkU8(AMD64G_FC_SHIFT_C2))) );
}

/* Generate code to check that abs(d64) < 2^63 and is finite.  This is
   used to do the range checks for FSIN, FCOS, FSINCOS and FPTAN.  The
   test is simple, but the derivation of it is not so simple.

   The exponent field for an IEEE754 double is 11 bits.  That means it
   can take values 0 through 0x7FF.  If the exponent has value 0x7FF,
   the number is either a NaN or an Infinity and so is not finite.
   Furthermore, a finite value of exactly 2^63 is the smallest value
   that has exponent value 0x43E.  Hence, what we need to do is
   extract the exponent, ignoring the sign bit and mantissa, and check
   it is < 0x43E, or <= 0x43D.

   To make this easily applicable to 32- and 64-bit targets, a
   roundabout approach is used.  First the number is converted to I64,
   then the top 32 bits are taken.  Shifting them right by 20 bits
   places the sign bit and exponent in the bottom 12 bits.  Anding
   with 0x7FF gets rid of the sign bit, leaving just the exponent
   available for comparison.
*/
static IRTemp math_IS_TRIG_ARG_FINITE_AND_IN_RANGE ( IRTemp d64 )
{
   IRTemp i64 = newTemp(Ity_I64);
   assign(i64, unop(Iop_ReinterpF64asI64, mkexpr(d64)) );
   IRTemp exponent = newTemp(Ity_I32);
   assign(exponent,
          binop(Iop_And32,
                binop(Iop_Shr32, unop(Iop_64HIto32, mkexpr(i64)), mkU8(20)),
                mkU32(0x7FF)));
   IRTemp in_range_and_finite = newTemp(Ity_I1);
   assign(in_range_and_finite,
          binop(Iop_CmpLE32U, mkexpr(exponent), mkU32(0x43D)));
   return in_range_and_finite;
}

/* Invent a plausible-looking FPU status word value:
      ((ftop & 7) << 11) | (c3210 & 0x4700)
 */
static IRExpr* get_FPU_sw ( void )
{
   return
      unop(Iop_32to16,
           binop(Iop_Or32,
                 binop(Iop_Shl32,
                       binop(Iop_And32, get_ftop(), mkU32(7)),
                             mkU8(11)),
                       binop(Iop_And32, unop(Iop_64to32, get_C3210()),
                                        mkU32(0x4700))
      ));
}


/* Generate a dirty helper call that initialises the x87 state a la
   FINIT.  If |guard| is NULL, it is done unconditionally.  Otherwise
   |guard| is used as a guarding condition.
*/
static void gen_FINIT_SEQUENCE ( IRExpr* guard )
{
   /* Uses dirty helper:
         void amd64g_do_FINIT ( VexGuestAMD64State* ) */
   IRDirty* d  = unsafeIRDirty_0_N (
                    0/*regparms*/,
                    "amd64g_dirtyhelper_FINIT",
                    &amd64g_dirtyhelper_FINIT,
                    mkIRExprVec_1( IRExpr_BBPTR() )
                 );

   /* declare we're writing guest state */
   d->nFxState = 5;
   vex_bzero(&d->fxState, sizeof(d->fxState));

   d->fxState[0].fx     = Ifx_Write;
   d->fxState[0].offset = OFFB_FTOP;
   d->fxState[0].size   = sizeof(UInt);

   d->fxState[1].fx     = Ifx_Write;
   d->fxState[1].offset = OFFB_FPREGS;
   d->fxState[1].size   = 8 * sizeof(ULong);

   d->fxState[2].fx     = Ifx_Write;
   d->fxState[2].offset = OFFB_FPTAGS;
   d->fxState[2].size   = 8 * sizeof(UChar);

   d->fxState[3].fx     = Ifx_Write;
   d->fxState[3].offset = OFFB_FPROUND;
   d->fxState[3].size   = sizeof(ULong);

   d->fxState[4].fx     = Ifx_Write;
   d->fxState[4].offset = OFFB_FC3210;
   d->fxState[4].size   = sizeof(ULong);

   if (guard)
      d->guard = guard;

   stmt( IRStmt_Dirty(d) );
}


/* ------------------------------------------------------- */
/* Given all that stack-mangling junk, we can now go ahead
   and describe FP instructions.
*/

/* ST(0) = ST(0) `op` mem64/32(addr)
   Need to check ST(0)'s tag on read, but not on write.
*/
static
void fp_do_op_mem_ST_0 ( IRTemp addr, const HChar* op_txt, HChar* dis_buf,
                         IROp op, Bool dbl )
{
   DIP("f%s%c %s\n", op_txt, dbl?'l':'s', dis_buf);
   if (dbl) {
      put_ST_UNCHECKED(0,
         triop( op,
                get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                get_ST(0),
                loadLE(Ity_F64,mkexpr(addr))
         ));
   } else {
      put_ST_UNCHECKED(0,
         triop( op,
                get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                get_ST(0),
                unop(Iop_F32toF64, loadLE(Ity_F32,mkexpr(addr)))
         ));
   }
}


/* ST(0) = mem64/32(addr) `op` ST(0)
   Need to check ST(0)'s tag on read, but not on write.
*/
static
void fp_do_oprev_mem_ST_0 ( IRTemp addr, const HChar* op_txt, HChar* dis_buf,
                            IROp op, Bool dbl )
{
   DIP("f%s%c %s\n", op_txt, dbl?'l':'s', dis_buf);
   if (dbl) {
      put_ST_UNCHECKED(0,
         triop( op,
                get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                loadLE(Ity_F64,mkexpr(addr)),
                get_ST(0)
         ));
   } else {
      put_ST_UNCHECKED(0,
         triop( op,
                get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                unop(Iop_F32toF64, loadLE(Ity_F32,mkexpr(addr))),
                get_ST(0)
         ));
   }
}


/* ST(dst) = ST(dst) `op` ST(src).
   Check dst and src tags when reading but not on write.
*/
static
void fp_do_op_ST_ST ( const HChar* op_txt, IROp op, UInt st_src, UInt st_dst,
                      Bool pop_after )
{
   DIP("f%s%s st(%u), st(%u)\n", op_txt, pop_after?"p":"", st_src, st_dst );
   put_ST_UNCHECKED(
      st_dst,
      triop( op,
             get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
             get_ST(st_dst),
             get_ST(st_src) )
   );
   if (pop_after)
      fp_pop();
}

/* ST(dst) = ST(src) `op` ST(dst).
   Check dst and src tags when reading but not on write.
*/
static
void fp_do_oprev_ST_ST ( const HChar* op_txt, IROp op, UInt st_src, UInt st_dst,
                         Bool pop_after )
{
   DIP("f%s%s st(%u), st(%u)\n", op_txt, pop_after?"p":"", st_src, st_dst );
   put_ST_UNCHECKED(
      st_dst,
      triop( op,
             get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
             get_ST(st_src),
             get_ST(st_dst) )
   );
   if (pop_after)
      fp_pop();
}

/* %rflags(Z,P,C) = UCOMI( st(0), st(i) ) */
static void fp_do_ucomi_ST0_STi ( UInt i, Bool pop_after )
{
   DIP("fucomi%s %%st(0),%%st(%u)\n", pop_after ? "p" : "", i);
   /* This is a bit of a hack (and isn't really right).  It sets
      Z,P,C,O correctly, but forces A and S to zero, whereas the Intel
      documentation implies A and S are unchanged.
   */
   /* It's also fishy in that it is used both for COMIP and
      UCOMIP, and they aren't the same (although similar). */
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
   stmt( IRStmt_Put(
            OFFB_CC_DEP1,
            binop( Iop_And64,
                   unop( Iop_32Uto64,
                         binop(Iop_CmpF64, get_ST(0), get_ST(i))),
                   mkU64(0x45)
        )));
   if (pop_after)
      fp_pop();
}


/* returns
   32to16( if e32 <s -32768 || e32 >s 32767 then -32768 else e32 )
*/
static IRExpr* x87ishly_qnarrow_32_to_16 ( IRExpr* e32 )
{
   IRTemp t32 = newTemp(Ity_I32);
   assign( t32, e32 );
   return
      IRExpr_ITE(
         binop(Iop_CmpLT64U,
               unop(Iop_32Uto64,
                    binop(Iop_Add32, mkexpr(t32), mkU32(32768))),
               mkU64(65536)),
         unop(Iop_32to16, mkexpr(t32)),
         mkU16( 0x8000 ) );
}


static
ULong dis_FPU ( /*OUT*/Bool* decode_ok,
                const VexAbiInfo* vbi, Prefix pfx, Long delta )
{
   Int    len;
   UInt   r_src, r_dst;
   HChar  dis_buf[50];
   IRTemp t1, t2;

   /* On entry, delta points at the second byte of the insn (the modrm
      byte).*/
   UChar first_opcode = getUChar(delta-1);
   UChar modrm        = getUChar(delta+0);

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xD8 opcodes +-+-+-+-+-+-+-+ */

   if (first_opcode == 0xD8) {
      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
           specifies an address. */
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;

         switch (gregLO3ofRM(modrm)) {

            case 0: /* FADD single-real */
               fp_do_op_mem_ST_0 ( addr, "add", dis_buf, Iop_AddF64, False );
               break;

            case 1: /* FMUL single-real */
               fp_do_op_mem_ST_0 ( addr, "mul", dis_buf, Iop_MulF64, False );
               break;

            case 2: /* FCOM single-real */
               DIP("fcoms %s\n", dis_buf);
               /* This forces C1 to zero, which isn't right. */
               /* The AMD documentation suggests that forcing C1 to
                  zero is correct (Eliot Moss) */
               put_C3210(
                   unop( Iop_32Uto64,
                       binop( Iop_And32,
                              binop(Iop_Shl32,
                                    binop(Iop_CmpF64,
                                          get_ST(0),
                                          unop(Iop_F32toF64,
                                               loadLE(Ity_F32,mkexpr(addr)))),
                                    mkU8(8)),
                              mkU32(0x4500)
                   )));
               break;

            case 3: /* FCOMP single-real */
               /* The AMD documentation suggests that forcing C1 to
                  zero is correct (Eliot Moss) */
               DIP("fcomps %s\n", dis_buf);
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop( Iop_32Uto64,
                       binop( Iop_And32,
                              binop(Iop_Shl32,
                                    binop(Iop_CmpF64,
                                          get_ST(0),
                                          unop(Iop_F32toF64,
                                               loadLE(Ity_F32,mkexpr(addr)))),
                                    mkU8(8)),
                              mkU32(0x4500)
                   )));
               fp_pop();
               break;

            case 4: /* FSUB single-real */
               fp_do_op_mem_ST_0 ( addr, "sub", dis_buf, Iop_SubF64, False );
               break;

            case 5: /* FSUBR single-real */
               fp_do_oprev_mem_ST_0 ( addr, "subr", dis_buf, Iop_SubF64, False );
               break;

            case 6: /* FDIV single-real */
               fp_do_op_mem_ST_0 ( addr, "div", dis_buf, Iop_DivF64, False );
               break;

            case 7: /* FDIVR single-real */
               fp_do_oprev_mem_ST_0 ( addr, "divr", dis_buf, Iop_DivF64, False );
               break;

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xD8\n");
               goto decode_fail;
         }
      } else {
         delta++;
         switch (modrm) {

            case 0xC0 ... 0xC7: /* FADD %st(?),%st(0) */
               fp_do_op_ST_ST ( "add", Iop_AddF64, modrm - 0xC0, 0, False );
               break;

            case 0xC8 ... 0xCF: /* FMUL %st(?),%st(0) */
               fp_do_op_ST_ST ( "mul", Iop_MulF64, modrm - 0xC8, 0, False );
               break;

            /* Dunno if this is right */
            case 0xD0 ... 0xD7: /* FCOM %st(?),%st(0) */
               r_dst = (UInt)modrm - 0xD0;
               DIP("fcom %%st(0),%%st(%u)\n", r_dst);
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop(Iop_32Uto64,
                   binop( Iop_And32,
                          binop(Iop_Shl32,
                                binop(Iop_CmpF64, get_ST(0), get_ST(r_dst)),
                                mkU8(8)),
                          mkU32(0x4500)
                   )));
               break;

            /* Dunno if this is right */
            case 0xD8 ... 0xDF: /* FCOMP %st(?),%st(0) */
               r_dst = (UInt)modrm - 0xD8;
               DIP("fcomp %%st(0),%%st(%u)\n", r_dst);
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop(Iop_32Uto64,
                   binop( Iop_And32,
                          binop(Iop_Shl32,
                                binop(Iop_CmpF64, get_ST(0), get_ST(r_dst)),
                                mkU8(8)),
                          mkU32(0x4500)
                   )));
               fp_pop();
               break;

            case 0xE0 ... 0xE7: /* FSUB %st(?),%st(0) */
               fp_do_op_ST_ST ( "sub", Iop_SubF64, modrm - 0xE0, 0, False );
               break;

            case 0xE8 ... 0xEF: /* FSUBR %st(?),%st(0) */
               fp_do_oprev_ST_ST ( "subr", Iop_SubF64, modrm - 0xE8, 0, False );
               break;

            case 0xF0 ... 0xF7: /* FDIV %st(?),%st(0) */
               fp_do_op_ST_ST ( "div", Iop_DivF64, modrm - 0xF0, 0, False );
               break;

            case 0xF8 ... 0xFF: /* FDIVR %st(?),%st(0) */
               fp_do_oprev_ST_ST ( "divr", Iop_DivF64, modrm - 0xF8, 0, False );
               break;

            default:
               goto decode_fail;
         }
      }
   }

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xD9 opcodes +-+-+-+-+-+-+-+ */
   else
   if (first_opcode == 0xD9) {
      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
            specifies an address. */
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;

         switch (gregLO3ofRM(modrm)) {

            case 0: /* FLD single-real */
               DIP("flds %s\n", dis_buf);
               fp_push();
               put_ST(0, unop(Iop_F32toF64,
                              loadLE(Ity_F32, mkexpr(addr))));
               break;

            case 2: /* FST single-real */
               DIP("fsts %s\n", dis_buf);
               storeLE(mkexpr(addr),
                       binop(Iop_F64toF32, get_roundingmode(), get_ST(0)));
               break;

            case 3: /* FSTP single-real */
               DIP("fstps %s\n", dis_buf);
               storeLE(mkexpr(addr),
                       binop(Iop_F64toF32, get_roundingmode(), get_ST(0)));
               fp_pop();
               break;

            case 4: { /* FLDENV m28 */
               /* Uses dirty helper:
                     VexEmNote amd64g_do_FLDENV ( VexGuestX86State*, HWord ) */
               IRTemp    ew = newTemp(Ity_I32);
               IRTemp   w64 = newTemp(Ity_I64);
               IRDirty*   d = unsafeIRDirty_0_N (
                                 0/*regparms*/,
                                 "amd64g_dirtyhelper_FLDENV",
                                 &amd64g_dirtyhelper_FLDENV,
                                 mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                              );
               d->tmp       = w64;
               /* declare we're reading memory */
               d->mFx   = Ifx_Read;
               d->mAddr = mkexpr(addr);
               d->mSize = 28;

               /* declare we're writing guest state */
               d->nFxState = 4;
               vex_bzero(&d->fxState, sizeof(d->fxState));

               d->fxState[0].fx     = Ifx_Write;
               d->fxState[0].offset = OFFB_FTOP;
               d->fxState[0].size   = sizeof(UInt);

               d->fxState[1].fx     = Ifx_Write;
               d->fxState[1].offset = OFFB_FPTAGS;
               d->fxState[1].size   = 8 * sizeof(UChar);

               d->fxState[2].fx     = Ifx_Write;
               d->fxState[2].offset = OFFB_FPROUND;
               d->fxState[2].size   = sizeof(ULong);

               d->fxState[3].fx     = Ifx_Write;
               d->fxState[3].offset = OFFB_FC3210;
               d->fxState[3].size   = sizeof(ULong);

               stmt( IRStmt_Dirty(d) );

               /* ew contains any emulation warning we may need to
                  issue.  If needed, side-exit to the next insn,
                  reporting the warning, so that Valgrind's dispatcher
                  sees the warning. */
               assign(ew, unop(Iop_64to32,mkexpr(w64)) );
               put_emwarn( mkexpr(ew) );
               stmt(
                  IRStmt_Exit(
                     binop(Iop_CmpNE32, mkexpr(ew), mkU32(0)),
                     Ijk_EmWarn,
                     IRConst_U64( guest_RIP_bbstart+delta ),
                     OFFB_RIP
                  )
               );

               DIP("fldenv %s\n", dis_buf);
               break;
            }

            case 5: {/* FLDCW */
               /* The only thing we observe in the control word is the
                  rounding mode.  Therefore, pass the 16-bit value
                  (x87 native-format control word) to a clean helper,
                  getting back a 64-bit value, the lower half of which
                  is the FPROUND value to store, and the upper half of
                  which is the emulation-warning token which may be
                  generated.
               */
               /* ULong amd64h_check_fldcw ( ULong ); */
               IRTemp t64 = newTemp(Ity_I64);
               IRTemp ew = newTemp(Ity_I32);
               DIP("fldcw %s\n", dis_buf);
               assign( t64, mkIRExprCCall(
                               Ity_I64, 0/*regparms*/,
                               "amd64g_check_fldcw",
                               &amd64g_check_fldcw,
                               mkIRExprVec_1(
                                  unop( Iop_16Uto64,
                                        loadLE(Ity_I16, mkexpr(addr)))
                               )
                            )
                     );

               put_fpround( unop(Iop_64to32, mkexpr(t64)) );
               assign( ew, unop(Iop_64HIto32, mkexpr(t64) ) );
               put_emwarn( mkexpr(ew) );
               /* Finally, if an emulation warning was reported,
                  side-exit to the next insn, reporting the warning,
                  so that Valgrind's dispatcher sees the warning. */
               stmt(
                  IRStmt_Exit(
                     binop(Iop_CmpNE32, mkexpr(ew), mkU32(0)),
                     Ijk_EmWarn,
                     IRConst_U64( guest_RIP_bbstart+delta ),
                     OFFB_RIP
                  )
               );
               break;
            }

            case 6: { /* FNSTENV m28 */
               /* Uses dirty helper:
                     void amd64g_do_FSTENV ( VexGuestAMD64State*, HWord ) */
               IRDirty* d = unsafeIRDirty_0_N (
                               0/*regparms*/,
                               "amd64g_dirtyhelper_FSTENV",
                               &amd64g_dirtyhelper_FSTENV,
                               mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                            );
               /* declare we're writing memory */
               d->mFx   = Ifx_Write;
               d->mAddr = mkexpr(addr);
               d->mSize = 28;

               /* declare we're reading guest state */
               d->nFxState = 4;
               vex_bzero(&d->fxState, sizeof(d->fxState));

               d->fxState[0].fx     = Ifx_Read;
               d->fxState[0].offset = OFFB_FTOP;
               d->fxState[0].size   = sizeof(UInt);

               d->fxState[1].fx     = Ifx_Read;
               d->fxState[1].offset = OFFB_FPTAGS;
               d->fxState[1].size   = 8 * sizeof(UChar);

               d->fxState[2].fx     = Ifx_Read;
               d->fxState[2].offset = OFFB_FPROUND;
               d->fxState[2].size   = sizeof(ULong);

               d->fxState[3].fx     = Ifx_Read;
               d->fxState[3].offset = OFFB_FC3210;
               d->fxState[3].size   = sizeof(ULong);

               stmt( IRStmt_Dirty(d) );

               DIP("fnstenv %s\n", dis_buf);
               break;
            }

            case 7: /* FNSTCW */
               /* Fake up a native x87 FPU control word.  The only
                  thing it depends on is FPROUND[1:0], so call a clean
                  helper to cook it up. */
               /* ULong amd64g_create_fpucw ( ULong fpround ) */
               DIP("fnstcw %s\n", dis_buf);
               storeLE(
                  mkexpr(addr),
                  unop( Iop_64to16,
                        mkIRExprCCall(
                           Ity_I64, 0/*regp*/,
                           "amd64g_create_fpucw", &amd64g_create_fpucw,
                           mkIRExprVec_1( unop(Iop_32Uto64, get_fpround()) )
                        )
                  )
               );
               break;

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xD9\n");
               goto decode_fail;
         }

      } else {
         delta++;
         switch (modrm) {

            case 0xC0 ... 0xC7: /* FLD %st(?) */
               r_src = (UInt)modrm - 0xC0;
               DIP("fld %%st(%u)\n", r_src);
               t1 = newTemp(Ity_F64);
               assign(t1, get_ST(r_src));
               fp_push();
               put_ST(0, mkexpr(t1));
               break;

            case 0xC8 ... 0xCF: /* FXCH %st(?) */
               r_src = (UInt)modrm - 0xC8;
               DIP("fxch %%st(%u)\n", r_src);
               t1 = newTemp(Ity_F64);
               t2 = newTemp(Ity_F64);
               assign(t1, get_ST(0));
               assign(t2, get_ST(r_src));
               put_ST_UNCHECKED(0, mkexpr(t2));
               put_ST_UNCHECKED(r_src, mkexpr(t1));
               break;

            case 0xE0: /* FCHS */
               DIP("fchs\n");
               put_ST_UNCHECKED(0, unop(Iop_NegF64, get_ST(0)));
               break;

            case 0xE1: /* FABS */
               DIP("fabs\n");
               put_ST_UNCHECKED(0, unop(Iop_AbsF64, get_ST(0)));
               break;

            case 0xE5: { /* FXAM */
               /* This is an interesting one.  It examines %st(0),
                  regardless of whether the tag says it's empty or not.
                  Here, just pass both the tag (in our format) and the
                  value (as a double, actually a ULong) to a helper
                  function. */
               IRExpr** args
                  = mkIRExprVec_2( unop(Iop_8Uto64, get_ST_TAG(0)),
                                   unop(Iop_ReinterpF64asI64,
                                        get_ST_UNCHECKED(0)) );
               put_C3210(mkIRExprCCall(
                            Ity_I64,
                            0/*regparm*/,
                            "amd64g_calculate_FXAM", &amd64g_calculate_FXAM,
                            args
                        ));
               DIP("fxam\n");
               break;
            }

            case 0xE8: /* FLD1 */
               DIP("fld1\n");
               fp_push();
               /* put_ST(0, IRExpr_Const(IRConst_F64(1.0))); */
               put_ST(0, IRExpr_Const(IRConst_F64i(0x3ff0000000000000ULL)));
               break;

            case 0xE9: /* FLDL2T */
               DIP("fldl2t\n");
               fp_push();
               /* put_ST(0, IRExpr_Const(IRConst_F64(3.32192809488736234781))); */
               put_ST(0, IRExpr_Const(IRConst_F64i(0x400a934f0979a371ULL)));
               break;

            case 0xEA: /* FLDL2E */
               DIP("fldl2e\n");
               fp_push();
               /* put_ST(0, IRExpr_Const(IRConst_F64(1.44269504088896340739))); */
               put_ST(0, IRExpr_Const(IRConst_F64i(0x3ff71547652b82feULL)));
               break;

            case 0xEB: /* FLDPI */
               DIP("fldpi\n");
               fp_push();
               /* put_ST(0, IRExpr_Const(IRConst_F64(3.14159265358979323851))); */
               put_ST(0, IRExpr_Const(IRConst_F64i(0x400921fb54442d18ULL)));
               break;

            case 0xEC: /* FLDLG2 */
               DIP("fldlg2\n");
               fp_push();
               /* put_ST(0, IRExpr_Const(IRConst_F64(0.301029995663981143))); */
               put_ST(0, IRExpr_Const(IRConst_F64i(0x3fd34413509f79ffULL)));
               break;

            case 0xED: /* FLDLN2 */
               DIP("fldln2\n");
               fp_push();
               /* put_ST(0, IRExpr_Const(IRConst_F64(0.69314718055994530942))); */
               put_ST(0, IRExpr_Const(IRConst_F64i(0x3fe62e42fefa39efULL)));
               break;

            case 0xEE: /* FLDZ */
               DIP("fldz\n");
               fp_push();
               /* put_ST(0, IRExpr_Const(IRConst_F64(0.0))); */
               put_ST(0, IRExpr_Const(IRConst_F64i(0x0000000000000000ULL)));
               break;

            case 0xF0: /* F2XM1 */
               DIP("f2xm1\n");
               put_ST_UNCHECKED(0,
                  binop(Iop_2xm1F64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(0)));
               break;

            case 0xF1: /* FYL2X */
               DIP("fyl2x\n");
               put_ST_UNCHECKED(1,
                  triop(Iop_Yl2xF64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(1),
                        get_ST(0)));
               fp_pop();
               break;

            case 0xF2: { /* FPTAN */
               DIP("fptan\n");
               IRTemp argD = newTemp(Ity_F64);
               assign(argD, get_ST(0));
               IRTemp argOK = math_IS_TRIG_ARG_FINITE_AND_IN_RANGE(argD);
               IRTemp resD = newTemp(Ity_F64);
               assign(resD,
                  IRExpr_ITE(
                     mkexpr(argOK),
                     binop(Iop_TanF64,
                           get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                           mkexpr(argD)),
                     mkexpr(argD))
               );
               put_ST_UNCHECKED(0, mkexpr(resD));
               /* Conditionally push 1.0 on the stack, if the arg is
                  in range */
               maybe_fp_push(argOK);
               maybe_put_ST(argOK, 0,
                            IRExpr_Const(IRConst_F64(1.0)));
               set_C2( binop(Iop_Xor64,
                             unop(Iop_1Uto64, mkexpr(argOK)),
                             mkU64(1)) );
               break;
            }

            case 0xF3: /* FPATAN */
               DIP("fpatan\n");
               put_ST_UNCHECKED(1,
                  triop(Iop_AtanF64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(1),
                        get_ST(0)));
               fp_pop();
               break;

            case 0xF4: { /* FXTRACT */
               IRTemp argF = newTemp(Ity_F64);
               IRTemp sigF = newTemp(Ity_F64);
               IRTemp expF = newTemp(Ity_F64);
               IRTemp argI = newTemp(Ity_I64);
               IRTemp sigI = newTemp(Ity_I64);
               IRTemp expI = newTemp(Ity_I64);
               DIP("fxtract\n");
               assign( argF, get_ST(0) );
               assign( argI, unop(Iop_ReinterpF64asI64, mkexpr(argF)));
               assign( sigI,
                       mkIRExprCCall(
                          Ity_I64, 0/*regparms*/,
                          "x86amd64g_calculate_FXTRACT",
                          &x86amd64g_calculate_FXTRACT,
                          mkIRExprVec_2( mkexpr(argI),
                                         mkIRExpr_HWord(0)/*sig*/ ))
               );
               assign( expI,
                       mkIRExprCCall(
                          Ity_I64, 0/*regparms*/,
                          "x86amd64g_calculate_FXTRACT",
                          &x86amd64g_calculate_FXTRACT,
                          mkIRExprVec_2( mkexpr(argI),
                                         mkIRExpr_HWord(1)/*exp*/ ))
               );
               assign( sigF, unop(Iop_ReinterpI64asF64, mkexpr(sigI)) );
               assign( expF, unop(Iop_ReinterpI64asF64, mkexpr(expI)) );
               /* exponent */
               put_ST_UNCHECKED(0, mkexpr(expF) );
               fp_push();
               /* significand */
               put_ST(0, mkexpr(sigF) );
               break;
            }

            case 0xF5: { /* FPREM1 -- IEEE compliant */
               IRTemp a1 = newTemp(Ity_F64);
               IRTemp a2 = newTemp(Ity_F64);
               DIP("fprem1\n");
               /* Do FPREM1 twice, once to get the remainder, and once
                  to get the C3210 flag values. */
               assign( a1, get_ST(0) );
               assign( a2, get_ST(1) );
               put_ST_UNCHECKED(0,
                  triop(Iop_PRem1F64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        mkexpr(a1),
                        mkexpr(a2)));
               put_C3210(
                  unop(Iop_32Uto64,
                  triop(Iop_PRem1C3210F64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        mkexpr(a1),
                        mkexpr(a2)) ));
               break;
            }

            case 0xF7: /* FINCSTP */
               DIP("fincstp\n");
               put_ftop( binop(Iop_Add32, get_ftop(), mkU32(1)) );
               break;

            case 0xF8: { /* FPREM -- not IEEE compliant */
               IRTemp a1 = newTemp(Ity_F64);
               IRTemp a2 = newTemp(Ity_F64);
               DIP("fprem\n");
               /* Do FPREM twice, once to get the remainder, and once
                  to get the C3210 flag values. */
               assign( a1, get_ST(0) );
               assign( a2, get_ST(1) );
               put_ST_UNCHECKED(0,
                  triop(Iop_PRemF64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        mkexpr(a1),
                        mkexpr(a2)));
               put_C3210(
                  unop(Iop_32Uto64,
                  triop(Iop_PRemC3210F64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        mkexpr(a1),
                        mkexpr(a2)) ));
               break;
            }

            case 0xF9: /* FYL2XP1 */
               DIP("fyl2xp1\n");
               put_ST_UNCHECKED(1,
                  triop(Iop_Yl2xp1F64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(1),
                        get_ST(0)));
               fp_pop();
               break;

            case 0xFA: /* FSQRT */
               DIP("fsqrt\n");
               put_ST_UNCHECKED(0,
                  binop(Iop_SqrtF64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(0)));
               break;

            case 0xFB: { /* FSINCOS */
               DIP("fsincos\n");
               IRTemp argD = newTemp(Ity_F64);
               assign(argD, get_ST(0));
               IRTemp argOK = math_IS_TRIG_ARG_FINITE_AND_IN_RANGE(argD);
               IRTemp resD = newTemp(Ity_F64);
               assign(resD,
                  IRExpr_ITE(
                     mkexpr(argOK),
                     binop(Iop_SinF64,
                           get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                           mkexpr(argD)),
                     mkexpr(argD))
               );
               put_ST_UNCHECKED(0, mkexpr(resD));
               /* Conditionally push the cos value on the stack, if
                  the arg is in range */
               maybe_fp_push(argOK);
               maybe_put_ST(argOK, 0,
                  binop(Iop_CosF64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        mkexpr(argD)));
               set_C2( binop(Iop_Xor64,
                             unop(Iop_1Uto64, mkexpr(argOK)),
                             mkU64(1)) );
               break;
            }

            case 0xFC: /* FRNDINT */
               DIP("frndint\n");
               put_ST_UNCHECKED(0,
                  binop(Iop_RoundF64toInt, get_roundingmode(), get_ST(0)) );
               break;

            case 0xFD: /* FSCALE */
               DIP("fscale\n");
               put_ST_UNCHECKED(0,
                  triop(Iop_ScaleF64,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(0),
                        get_ST(1)));
               break;

            case 0xFE:   /* FSIN */
            case 0xFF: { /* FCOS */
               Bool isSIN = modrm == 0xFE;
               DIP("%s\n", isSIN ? "fsin" : "fcos");
               IRTemp argD = newTemp(Ity_F64);
               assign(argD, get_ST(0));
               IRTemp argOK = math_IS_TRIG_ARG_FINITE_AND_IN_RANGE(argD);
               IRTemp resD = newTemp(Ity_F64);
               assign(resD,
                  IRExpr_ITE(
                     mkexpr(argOK),
                     binop(isSIN ? Iop_SinF64 : Iop_CosF64,
                           get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                           mkexpr(argD)),
                     mkexpr(argD))
               );
               put_ST_UNCHECKED(0, mkexpr(resD));
               set_C2( binop(Iop_Xor64,
                             unop(Iop_1Uto64, mkexpr(argOK)),
                             mkU64(1)) );
               break;
            }

            default:
               goto decode_fail;
         }
      }
   }

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xDA opcodes +-+-+-+-+-+-+-+ */
   else
   if (first_opcode == 0xDA) {

      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
            specifies an address. */
         IROp   fop;
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;
         switch (gregLO3ofRM(modrm)) {

            case 0: /* FIADD m32int */ /* ST(0) += m32int */
               DIP("fiaddl %s\n", dis_buf);
               fop = Iop_AddF64;
               goto do_fop_m32;

            case 1: /* FIMUL m32int */ /* ST(0) *= m32int */
               DIP("fimull %s\n", dis_buf);
               fop = Iop_MulF64;
               goto do_fop_m32;

            case 4: /* FISUB m32int */ /* ST(0) -= m32int */
               DIP("fisubl %s\n", dis_buf);
               fop = Iop_SubF64;
               goto do_fop_m32;

            case 5: /* FISUBR m32int */ /* ST(0) = m32int - ST(0) */
               DIP("fisubrl %s\n", dis_buf);
               fop = Iop_SubF64;
               goto do_foprev_m32;

            case 6: /* FIDIV m32int */ /* ST(0) /= m32int */
               DIP("fisubl %s\n", dis_buf);
               fop = Iop_DivF64;
               goto do_fop_m32;

            case 7: /* FIDIVR m32int */ /* ST(0) = m32int / ST(0) */
               DIP("fidivrl %s\n", dis_buf);
               fop = Iop_DivF64;
               goto do_foprev_m32;

            do_fop_m32:
               put_ST_UNCHECKED(0,
                  triop(fop,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(0),
                        unop(Iop_I32StoF64,
                             loadLE(Ity_I32, mkexpr(addr)))));
               break;

            do_foprev_m32:
               put_ST_UNCHECKED(0,
                  triop(fop,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        unop(Iop_I32StoF64,
                             loadLE(Ity_I32, mkexpr(addr))),
                        get_ST(0)));
               break;

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xDA\n");
               goto decode_fail;
         }

      } else {

         delta++;
         switch (modrm) {

            case 0xC0 ... 0xC7: /* FCMOVB ST(i), ST(0) */
               r_src = (UInt)modrm - 0xC0;
               DIP("fcmovb %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(0,
                                IRExpr_ITE(
                                    mk_amd64g_calculate_condition(AMD64CondB),
                                    get_ST(r_src), get_ST(0)) );
               break;

            case 0xC8 ... 0xCF: /* FCMOVE(Z) ST(i), ST(0) */
               r_src = (UInt)modrm - 0xC8;
               DIP("fcmovz %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(0,
                                IRExpr_ITE(
                                    mk_amd64g_calculate_condition(AMD64CondZ),
                                    get_ST(r_src), get_ST(0)) );
               break;

            case 0xD0 ... 0xD7: /* FCMOVBE ST(i), ST(0) */
               r_src = (UInt)modrm - 0xD0;
               DIP("fcmovbe %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(0,
                                IRExpr_ITE(
                                    mk_amd64g_calculate_condition(AMD64CondBE),
                                    get_ST(r_src), get_ST(0)) );
               break;

            case 0xD8 ... 0xDF: /* FCMOVU ST(i), ST(0) */
               r_src = (UInt)modrm - 0xD8;
               DIP("fcmovu %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(0,
                                IRExpr_ITE(
                                    mk_amd64g_calculate_condition(AMD64CondP),
                                    get_ST(r_src), get_ST(0)) );
               break;

            case 0xE9: /* FUCOMPP %st(0),%st(1) */
               DIP("fucompp %%st(0),%%st(1)\n");
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop(Iop_32Uto64,
                   binop( Iop_And32,
                          binop(Iop_Shl32,
                                binop(Iop_CmpF64, get_ST(0), get_ST(1)),
                                mkU8(8)),
                          mkU32(0x4500)
                   )));
               fp_pop();
               fp_pop();
               break;

            default:
               goto decode_fail;
         }

      }
   }

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xDB opcodes +-+-+-+-+-+-+-+ */
   else
   if (first_opcode == 0xDB) {
      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
            specifies an address. */
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;

         switch (gregLO3ofRM(modrm)) {

            case 0: /* FILD m32int */
               DIP("fildl %s\n", dis_buf);
               fp_push();
               put_ST(0, unop(Iop_I32StoF64,
                              loadLE(Ity_I32, mkexpr(addr))));
               break;

            case 1: /* FISTTPL m32 (SSE3) */
               DIP("fisttpl %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        binop(Iop_F64toI32S, mkU32(Irrm_ZERO), get_ST(0)) );
               fp_pop();
               break;

            case 2: /* FIST m32 */
               DIP("fistl %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        binop(Iop_F64toI32S, get_roundingmode(), get_ST(0)) );
               break;

            case 3: /* FISTP m32 */
               DIP("fistpl %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        binop(Iop_F64toI32S, get_roundingmode(), get_ST(0)) );
               fp_pop();
               break;

            case 5: { /* FLD extended-real */
               /* Uses dirty helper:
                     ULong amd64g_loadF80le ( ULong )
                  addr holds the address.  First, do a dirty call to
                  get hold of the data. */
               IRTemp   val  = newTemp(Ity_I64);
               IRExpr** args = mkIRExprVec_1 ( mkexpr(addr) );

               IRDirty* d = unsafeIRDirty_1_N (
                               val,
                               0/*regparms*/,
                               "amd64g_dirtyhelper_loadF80le",
                               &amd64g_dirtyhelper_loadF80le,
                               args
                            );
               /* declare that we're reading memory */
               d->mFx   = Ifx_Read;
               d->mAddr = mkexpr(addr);
               d->mSize = 10;

               /* execute the dirty call, dumping the result in val. */
               stmt( IRStmt_Dirty(d) );
               fp_push();
               put_ST(0, unop(Iop_ReinterpI64asF64, mkexpr(val)));

               DIP("fldt %s\n", dis_buf);
               break;
            }

            case 7: { /* FSTP extended-real */
               /* Uses dirty helper:
                     void amd64g_storeF80le ( ULong addr, ULong data )
               */
               IRExpr** args
                  = mkIRExprVec_2( mkexpr(addr),
                                   unop(Iop_ReinterpF64asI64, get_ST(0)) );

               IRDirty* d = unsafeIRDirty_0_N (
                               0/*regparms*/,
                               "amd64g_dirtyhelper_storeF80le",
                               &amd64g_dirtyhelper_storeF80le,
                               args
                            );
               /* declare we're writing memory */
               d->mFx   = Ifx_Write;
               d->mAddr = mkexpr(addr);
               d->mSize = 10;

               /* execute the dirty call. */
               stmt( IRStmt_Dirty(d) );
               fp_pop();

               DIP("fstpt\n %s", dis_buf);
               break;
            }

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xDB\n");
               goto decode_fail;
         }

      } else {

         delta++;
         switch (modrm) {

            case 0xC0 ... 0xC7: /* FCMOVNB ST(i), ST(0) */
               r_src = (UInt)modrm - 0xC0;
               DIP("fcmovnb %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(0,
                                IRExpr_ITE(
                                    mk_amd64g_calculate_condition(AMD64CondNB),
                                    get_ST(r_src), get_ST(0)) );
               break;

            case 0xC8 ... 0xCF: /* FCMOVNE(NZ) ST(i), ST(0) */
               r_src = (UInt)modrm - 0xC8;
               DIP("fcmovnz %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(
                  0,
                  IRExpr_ITE(
                     mk_amd64g_calculate_condition(AMD64CondNZ),
                     get_ST(r_src),
                     get_ST(0)
                  )
               );
               break;

            case 0xD0 ... 0xD7: /* FCMOVNBE ST(i), ST(0) */
               r_src = (UInt)modrm - 0xD0;
               DIP("fcmovnbe %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(
                  0,
                  IRExpr_ITE(
                     mk_amd64g_calculate_condition(AMD64CondNBE),
                     get_ST(r_src),
                     get_ST(0)
                  )
               );
               break;

            case 0xD8 ... 0xDF: /* FCMOVNU ST(i), ST(0) */
               r_src = (UInt)modrm - 0xD8;
               DIP("fcmovnu %%st(%u), %%st(0)\n", r_src);
               put_ST_UNCHECKED(
                  0,
                  IRExpr_ITE(
                     mk_amd64g_calculate_condition(AMD64CondNP),
                     get_ST(r_src),
                     get_ST(0)
                  )
               );
               break;

            case 0xE2:
               DIP("fnclex\n");
               break;

            case 0xE3: {
               gen_FINIT_SEQUENCE(NULL/*no guarding condition*/);
               DIP("fninit\n");
               break;
            }

            case 0xE8 ... 0xEF: /* FUCOMI %st(0),%st(?) */
               fp_do_ucomi_ST0_STi( (UInt)modrm - 0xE8, False );
               break;

            case 0xF0 ... 0xF7: /* FCOMI %st(0),%st(?) */
               fp_do_ucomi_ST0_STi( (UInt)modrm - 0xF0, False );
               break;

            default:
               goto decode_fail;
         }
      }
   }

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xDC opcodes +-+-+-+-+-+-+-+ */
   else
   if (first_opcode == 0xDC) {
      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
            specifies an address. */
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;

         switch (gregLO3ofRM(modrm)) {

            case 0: /* FADD double-real */
               fp_do_op_mem_ST_0 ( addr, "add", dis_buf, Iop_AddF64, True );
               break;

            case 1: /* FMUL double-real */
               fp_do_op_mem_ST_0 ( addr, "mul", dis_buf, Iop_MulF64, True );
               break;

//..             case 2: /* FCOM double-real */
//..                DIP("fcoml %s\n", dis_buf);
//..                /* This forces C1 to zero, which isn't right. */
//..                put_C3210(
//..                    binop( Iop_And32,
//..                           binop(Iop_Shl32,
//..                                 binop(Iop_CmpF64,
//..                                       get_ST(0),
//..                                       loadLE(Ity_F64,mkexpr(addr))),
//..                                 mkU8(8)),
//..                           mkU32(0x4500)
//..                    ));
//..                break;

            case 3: /* FCOMP double-real */
               DIP("fcompl %s\n", dis_buf);
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop(Iop_32Uto64,
                   binop( Iop_And32,
                          binop(Iop_Shl32,
                                binop(Iop_CmpF64,
                                      get_ST(0),
                                      loadLE(Ity_F64,mkexpr(addr))),
                                mkU8(8)),
                          mkU32(0x4500)
                   )));
               fp_pop();
               break;

            case 4: /* FSUB double-real */
               fp_do_op_mem_ST_0 ( addr, "sub", dis_buf, Iop_SubF64, True );
               break;

            case 5: /* FSUBR double-real */
               fp_do_oprev_mem_ST_0 ( addr, "subr", dis_buf, Iop_SubF64, True );
               break;

            case 6: /* FDIV double-real */
               fp_do_op_mem_ST_0 ( addr, "div", dis_buf, Iop_DivF64, True );
               break;

            case 7: /* FDIVR double-real */
               fp_do_oprev_mem_ST_0 ( addr, "divr", dis_buf, Iop_DivF64, True );
               break;

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xDC\n");
               goto decode_fail;
         }

      } else {

         delta++;
         switch (modrm) {

            case 0xC0 ... 0xC7: /* FADD %st(0),%st(?) */
               fp_do_op_ST_ST ( "add", Iop_AddF64, 0, modrm - 0xC0, False );
               break;

            case 0xC8 ... 0xCF: /* FMUL %st(0),%st(?) */
               fp_do_op_ST_ST ( "mul", Iop_MulF64, 0, modrm - 0xC8, False );
               break;

            case 0xE0 ... 0xE7: /* FSUBR %st(0),%st(?) */
               fp_do_oprev_ST_ST ( "subr", Iop_SubF64, 0, modrm - 0xE0, False );
               break;

            case 0xE8 ... 0xEF: /* FSUB %st(0),%st(?) */
               fp_do_op_ST_ST ( "sub", Iop_SubF64, 0, modrm - 0xE8, False );
               break;

            case 0xF0 ... 0xF7: /* FDIVR %st(0),%st(?) */
               fp_do_oprev_ST_ST ( "divr", Iop_DivF64, 0, modrm - 0xF0, False );
               break;

            case 0xF8 ... 0xFF: /* FDIV %st(0),%st(?) */
               fp_do_op_ST_ST ( "div", Iop_DivF64, 0, modrm - 0xF8, False );
               break;

            default:
               goto decode_fail;
         }

      }
   }

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xDD opcodes +-+-+-+-+-+-+-+ */
   else
   if (first_opcode == 0xDD) {

      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
            specifies an address. */
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;

         switch (gregLO3ofRM(modrm)) {

            case 0: /* FLD double-real */
               DIP("fldl %s\n", dis_buf);
               fp_push();
               put_ST(0, loadLE(Ity_F64, mkexpr(addr)));
               break;

            case 1: /* FISTTPQ m64 (SSE3) */
               DIP("fistppll %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        binop(Iop_F64toI64S, mkU32(Irrm_ZERO), get_ST(0)) );
               fp_pop();
               break;

            case 2: /* FST double-real */
               DIP("fstl %s\n", dis_buf);
               storeLE(mkexpr(addr), get_ST(0));
               break;

            case 3: /* FSTP double-real */
               DIP("fstpl %s\n", dis_buf);
               storeLE(mkexpr(addr), get_ST(0));
               fp_pop();
               break;

            case 4: { /* FRSTOR m94/m108 */
               IRTemp   ew = newTemp(Ity_I32);
               IRTemp  w64 = newTemp(Ity_I64);
               IRDirty*  d;
               if ( have66(pfx) ) {
                  /* Uses dirty helper:
                     VexEmNote amd64g_dirtyhelper_FRSTORS
                                  ( VexGuestAMD64State*, HWord ) */
                  d = unsafeIRDirty_0_N (
                         0/*regparms*/,
                         "amd64g_dirtyhelper_FRSTORS",
                         &amd64g_dirtyhelper_FRSTORS,
                         mkIRExprVec_1( mkexpr(addr) )
                      );
                  d->mSize = 94;
               } else {
                  /* Uses dirty helper:
                     VexEmNote amd64g_dirtyhelper_FRSTOR
                                  ( VexGuestAMD64State*, HWord ) */
                  d = unsafeIRDirty_0_N (
                         0/*regparms*/,
                         "amd64g_dirtyhelper_FRSTOR",
                         &amd64g_dirtyhelper_FRSTOR,
                         mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                      );
                  d->mSize = 108;
               }

               d->tmp    = w64;
               /* declare we're reading memory */
               d->mFx   = Ifx_Read;
               d->mAddr = mkexpr(addr);
               /* d->mSize set above */

               /* declare we're writing guest state */
               d->nFxState = 5;
               vex_bzero(&d->fxState, sizeof(d->fxState));

               d->fxState[0].fx     = Ifx_Write;
               d->fxState[0].offset = OFFB_FTOP;
               d->fxState[0].size   = sizeof(UInt);

               d->fxState[1].fx     = Ifx_Write;
               d->fxState[1].offset = OFFB_FPREGS;
               d->fxState[1].size   = 8 * sizeof(ULong);

               d->fxState[2].fx     = Ifx_Write;
               d->fxState[2].offset = OFFB_FPTAGS;
               d->fxState[2].size   = 8 * sizeof(UChar);

               d->fxState[3].fx     = Ifx_Write;
               d->fxState[3].offset = OFFB_FPROUND;
               d->fxState[3].size   = sizeof(ULong);

               d->fxState[4].fx     = Ifx_Write;
               d->fxState[4].offset = OFFB_FC3210;
               d->fxState[4].size   = sizeof(ULong);

               stmt( IRStmt_Dirty(d) );

               /* ew contains any emulation warning we may need to
                  issue.  If needed, side-exit to the next insn,
                  reporting the warning, so that Valgrind's dispatcher
                  sees the warning. */
               assign(ew, unop(Iop_64to32,mkexpr(w64)) );
               put_emwarn( mkexpr(ew) );
               stmt(
                  IRStmt_Exit(
                     binop(Iop_CmpNE32, mkexpr(ew), mkU32(0)),
                     Ijk_EmWarn,
                     IRConst_U64( guest_RIP_bbstart+delta ),
                     OFFB_RIP
                  )
               );

               if ( have66(pfx) ) {
                  DIP("frstors %s\n", dis_buf);
               } else {
                  DIP("frstor %s\n", dis_buf);
               }
               break;
            }

            case 6: { /* FNSAVE m94/m108 */
               IRDirty *d;
               if ( have66(pfx) ) {
                 /* Uses dirty helper:
                    void amd64g_dirtyhelper_FNSAVES ( VexGuestAMD64State*,
                                                      HWord ) */
                  d = unsafeIRDirty_0_N (
                         0/*regparms*/,
                         "amd64g_dirtyhelper_FNSAVES",
                         &amd64g_dirtyhelper_FNSAVES,
                         mkIRExprVec_1( mkexpr(addr) )
                         );
                  d->mSize = 94;
               } else {
                 /* Uses dirty helper:
                    void amd64g_dirtyhelper_FNSAVE ( VexGuestAMD64State*,
                                                     HWord ) */
                  d = unsafeIRDirty_0_N (
                         0/*regparms*/,
                         "amd64g_dirtyhelper_FNSAVE",
                         &amd64g_dirtyhelper_FNSAVE,
                         mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                      );
                  d->mSize = 108;
               }

               /* declare we're writing memory */
               d->mFx   = Ifx_Write;
               d->mAddr = mkexpr(addr);
               /* d->mSize set above */

               /* declare we're reading guest state */
               d->nFxState = 5;
               vex_bzero(&d->fxState, sizeof(d->fxState));

               d->fxState[0].fx     = Ifx_Read;
               d->fxState[0].offset = OFFB_FTOP;
               d->fxState[0].size   = sizeof(UInt);

               d->fxState[1].fx     = Ifx_Read;
               d->fxState[1].offset = OFFB_FPREGS;
               d->fxState[1].size   = 8 * sizeof(ULong);

               d->fxState[2].fx     = Ifx_Read;
               d->fxState[2].offset = OFFB_FPTAGS;
               d->fxState[2].size   = 8 * sizeof(UChar);

               d->fxState[3].fx     = Ifx_Read;
               d->fxState[3].offset = OFFB_FPROUND;
               d->fxState[3].size   = sizeof(ULong);

               d->fxState[4].fx     = Ifx_Read;
               d->fxState[4].offset = OFFB_FC3210;
               d->fxState[4].size   = sizeof(ULong);

               stmt( IRStmt_Dirty(d) );

               if ( have66(pfx) ) {
                 DIP("fnsaves %s\n", dis_buf);
               } else {
                 DIP("fnsave %s\n", dis_buf);
               }
               break;
            }

            case 7: { /* FNSTSW m16 */
               IRExpr* sw = get_FPU_sw();
               vassert(typeOfIRExpr(irsb->tyenv, sw) == Ity_I16);
               storeLE( mkexpr(addr), sw );
               DIP("fnstsw %s\n", dis_buf);
               break;
            }

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xDD\n");
               goto decode_fail;
         }
      } else {
         delta++;
         switch (modrm) {

            case 0xC0 ... 0xC7: /* FFREE %st(?) */
               r_dst = (UInt)modrm - 0xC0;
               DIP("ffree %%st(%u)\n", r_dst);
               put_ST_TAG ( r_dst, mkU8(0) );
               break;

            case 0xD0 ... 0xD7: /* FST %st(0),%st(?) */
               r_dst = (UInt)modrm - 0xD0;
               DIP("fst %%st(0),%%st(%u)\n", r_dst);
               /* P4 manual says: "If the destination operand is a
                  non-empty register, the invalid-operation exception
                  is not generated.  Hence put_ST_UNCHECKED. */
               put_ST_UNCHECKED(r_dst, get_ST(0));
               break;

            case 0xD8 ... 0xDF: /* FSTP %st(0),%st(?) */
               r_dst = (UInt)modrm - 0xD8;
               DIP("fstp %%st(0),%%st(%u)\n", r_dst);
               /* P4 manual says: "If the destination operand is a
                  non-empty register, the invalid-operation exception
                  is not generated.  Hence put_ST_UNCHECKED. */
               put_ST_UNCHECKED(r_dst, get_ST(0));
               fp_pop();
               break;

            case 0xE0 ... 0xE7: /* FUCOM %st(0),%st(?) */
               r_dst = (UInt)modrm - 0xE0;
               DIP("fucom %%st(0),%%st(%u)\n", r_dst);
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop(Iop_32Uto64,
                   binop( Iop_And32,
                          binop(Iop_Shl32,
                                binop(Iop_CmpF64, get_ST(0), get_ST(r_dst)),
                                mkU8(8)),
                          mkU32(0x4500)
                   )));
               break;

            case 0xE8 ... 0xEF: /* FUCOMP %st(0),%st(?) */
               r_dst = (UInt)modrm - 0xE8;
               DIP("fucomp %%st(0),%%st(%u)\n", r_dst);
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop(Iop_32Uto64,
                   binop( Iop_And32,
                          binop(Iop_Shl32,
                                binop(Iop_CmpF64, get_ST(0), get_ST(r_dst)),
                                mkU8(8)),
                          mkU32(0x4500)
                   )));
               fp_pop();
               break;

            default:
               goto decode_fail;
         }
      }
   }

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xDE opcodes +-+-+-+-+-+-+-+ */
   else
   if (first_opcode == 0xDE) {

      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
            specifies an address. */
         IROp   fop;
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;

         switch (gregLO3ofRM(modrm)) {

            case 0: /* FIADD m16int */ /* ST(0) += m16int */
               DIP("fiaddw %s\n", dis_buf);
               fop = Iop_AddF64;
               goto do_fop_m16;

            case 1: /* FIMUL m16int */ /* ST(0) *= m16int */
               DIP("fimulw %s\n", dis_buf);
               fop = Iop_MulF64;
               goto do_fop_m16;

            case 4: /* FISUB m16int */ /* ST(0) -= m16int */
               DIP("fisubw %s\n", dis_buf);
               fop = Iop_SubF64;
               goto do_fop_m16;

            case 5: /* FISUBR m16int */ /* ST(0) = m16int - ST(0) */
               DIP("fisubrw %s\n", dis_buf);
               fop = Iop_SubF64;
               goto do_foprev_m16;

            case 6: /* FIDIV m16int */ /* ST(0) /= m16int */
               DIP("fisubw %s\n", dis_buf);
               fop = Iop_DivF64;
               goto do_fop_m16;

            case 7: /* FIDIVR m16int */ /* ST(0) = m16int / ST(0) */
               DIP("fidivrw %s\n", dis_buf);
               fop = Iop_DivF64;
               goto do_foprev_m16;

            do_fop_m16:
               put_ST_UNCHECKED(0,
                  triop(fop,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        get_ST(0),
                        unop(Iop_I32StoF64,
                             unop(Iop_16Sto32,
                                  loadLE(Ity_I16, mkexpr(addr))))));
               break;

            do_foprev_m16:
               put_ST_UNCHECKED(0,
                  triop(fop,
                        get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        unop(Iop_I32StoF64,
                             unop(Iop_16Sto32,
                                  loadLE(Ity_I16, mkexpr(addr)))),
                        get_ST(0)));
               break;

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xDE\n");
               goto decode_fail;
         }

      } else {

         delta++;
         switch (modrm) {

            case 0xC0 ... 0xC7: /* FADDP %st(0),%st(?) */
               fp_do_op_ST_ST ( "add", Iop_AddF64, 0, modrm - 0xC0, True );
               break;

            case 0xC8 ... 0xCF: /* FMULP %st(0),%st(?) */
               fp_do_op_ST_ST ( "mul", Iop_MulF64, 0, modrm - 0xC8, True );
               break;

            case 0xD9: /* FCOMPP %st(0),%st(1) */
               DIP("fcompp %%st(0),%%st(1)\n");
               /* This forces C1 to zero, which isn't right. */
               put_C3210(
                   unop(Iop_32Uto64,
                   binop( Iop_And32,
                          binop(Iop_Shl32,
                                binop(Iop_CmpF64, get_ST(0), get_ST(1)),
                                mkU8(8)),
                          mkU32(0x4500)
                   )));
               fp_pop();
               fp_pop();
               break;

            case 0xE0 ... 0xE7: /* FSUBRP %st(0),%st(?) */
               fp_do_oprev_ST_ST ( "subr", Iop_SubF64, 0,  modrm - 0xE0, True );
               break;

            case 0xE8 ... 0xEF: /* FSUBP %st(0),%st(?) */
               fp_do_op_ST_ST ( "sub", Iop_SubF64, 0,  modrm - 0xE8, True );
               break;

            case 0xF0 ... 0xF7: /* FDIVRP %st(0),%st(?) */
               fp_do_oprev_ST_ST ( "divr", Iop_DivF64, 0, modrm - 0xF0, True );
               break;

            case 0xF8 ... 0xFF: /* FDIVP %st(0),%st(?) */
               fp_do_op_ST_ST ( "div", Iop_DivF64, 0, modrm - 0xF8, True );
               break;

            default:
               goto decode_fail;
         }

      }
   }

   /* -+-+-+-+-+-+-+-+-+-+-+-+ 0xDF opcodes +-+-+-+-+-+-+-+ */
   else
   if (first_opcode == 0xDF) {

      if (modrm < 0xC0) {

         /* bits 5,4,3 are an opcode extension, and the modRM also
            specifies an address. */
         IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
         delta += len;

         switch (gregLO3ofRM(modrm)) {

            case 0: /* FILD m16int */
               DIP("fildw %s\n", dis_buf);
               fp_push();
               put_ST(0, unop(Iop_I32StoF64,
                              unop(Iop_16Sto32,
                                   loadLE(Ity_I16, mkexpr(addr)))));
               break;

            case 1: /* FISTTPS m16 (SSE3) */
               DIP("fisttps %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        x87ishly_qnarrow_32_to_16(
                        binop(Iop_F64toI32S, mkU32(Irrm_ZERO), get_ST(0)) ));
               fp_pop();
               break;

            case 2: /* FIST m16 */
               DIP("fists %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        x87ishly_qnarrow_32_to_16(
                        binop(Iop_F64toI32S, get_roundingmode(), get_ST(0)) ));
               break;

            case 3: /* FISTP m16 */
               DIP("fistps %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        x87ishly_qnarrow_32_to_16(
                        binop(Iop_F64toI32S, get_roundingmode(), get_ST(0)) ));
               fp_pop();
               break;

            case 5: /* FILD m64 */
               DIP("fildll %s\n", dis_buf);
               fp_push();
               put_ST(0, binop(Iop_I64StoF64,
                               get_roundingmode(),
                               loadLE(Ity_I64, mkexpr(addr))));
               break;

            case 7: /* FISTP m64 */
               DIP("fistpll %s\n", dis_buf);
               storeLE( mkexpr(addr),
                        binop(Iop_F64toI64S, get_roundingmode(), get_ST(0)) );
               fp_pop();
               break;

            default:
               vex_printf("unhandled opc_aux = 0x%2x\n",
                          (UInt)gregLO3ofRM(modrm));
               vex_printf("first_opcode == 0xDF\n");
               goto decode_fail;
         }

      } else {

         delta++;
         switch (modrm) {

            case 0xC0: /* FFREEP %st(0) */
               DIP("ffreep %%st(%d)\n", 0);
               put_ST_TAG ( 0, mkU8(0) );
               fp_pop();
               break;

            case 0xE0: /* FNSTSW %ax */
               DIP("fnstsw %%ax\n");
               /* Invent a plausible-looking FPU status word value and
                  dump it in %AX:
                     ((ftop & 7) << 11) | (c3210 & 0x4700)
               */
               putIRegRAX(
                  2,
                  unop(Iop_32to16,
                       binop(Iop_Or32,
                             binop(Iop_Shl32,
                                   binop(Iop_And32, get_ftop(), mkU32(7)),
                                   mkU8(11)),
                             binop(Iop_And32,
                                   unop(Iop_64to32, get_C3210()),
                                   mkU32(0x4700))
               )));
               break;

            case 0xE8 ... 0xEF: /* FUCOMIP %st(0),%st(?) */
               fp_do_ucomi_ST0_STi( (UInt)modrm - 0xE8, True );
               break;

            case 0xF0 ... 0xF7: /* FCOMIP %st(0),%st(?) */
               /* not really right since COMIP != UCOMIP */
               fp_do_ucomi_ST0_STi( (UInt)modrm - 0xF0, True );
               break;

            default:
               goto decode_fail;
         }
      }

   }

   else
      goto decode_fail;

   *decode_ok = True;
   return delta;

  decode_fail:
   *decode_ok = False;
   return delta;
}


/*------------------------------------------------------------*/
/*---                                                      ---*/
/*--- MMX INSTRUCTIONS                                     ---*/
/*---                                                      ---*/
/*------------------------------------------------------------*/

/* Effect of MMX insns on x87 FPU state (table 11-2 of
   IA32 arch manual, volume 3):

   Read from, or write to MMX register (viz, any insn except EMMS):
   * All tags set to Valid (non-empty) -- FPTAGS[i] := nonzero
   * FP stack pointer set to zero

   EMMS:
   * All tags set to Invalid (empty) -- FPTAGS[i] := zero
   * FP stack pointer set to zero
*/

static void do_MMX_preamble ( void )
{
   Int         i;
   IRRegArray* descr = mkIRRegArray( OFFB_FPTAGS, Ity_I8, 8 );
   IRExpr*     zero  = mkU32(0);
   IRExpr*     tag1  = mkU8(1);
   put_ftop(zero);
   for (i = 0; i < 8; i++)
      stmt( IRStmt_PutI( mkIRPutI(descr, zero, i, tag1) ) );
}

static void do_EMMS_preamble ( void )
{
   Int         i;
   IRRegArray* descr = mkIRRegArray( OFFB_FPTAGS, Ity_I8, 8 );
   IRExpr*     zero  = mkU32(0);
   IRExpr*     tag0  = mkU8(0);
   put_ftop(zero);
   for (i = 0; i < 8; i++)
      stmt( IRStmt_PutI( mkIRPutI(descr, zero, i, tag0) ) );
}


static IRExpr* getMMXReg ( UInt archreg )
{
   vassert(archreg < 8);
   return IRExpr_Get( OFFB_FPREGS + 8 * archreg, Ity_I64 );
}


static void putMMXReg ( UInt archreg, IRExpr* e )
{
   vassert(archreg < 8);
   vassert(typeOfIRExpr(irsb->tyenv,e) == Ity_I64);
   stmt( IRStmt_Put( OFFB_FPREGS + 8 * archreg, e ) );
}


/* Helper for non-shift MMX insns.  Note this is incomplete in the
   sense that it does not first call do_MMX_preamble() -- that is the
   responsibility of its caller. */

static
ULong dis_MMXop_regmem_to_reg ( const VexAbiInfo* vbi,
                                Prefix      pfx,
                                Long        delta,
                                UChar       opc,
                                const HChar* name,
                                Bool        show_granularity )
{
   HChar   dis_buf[50];
   UChar   modrm = getUChar(delta);
   Bool    isReg = epartIsReg(modrm);
   IRExpr* argL  = NULL;
   IRExpr* argR  = NULL;
   IRExpr* argG  = NULL;
   IRExpr* argE  = NULL;
   IRTemp  res   = newTemp(Ity_I64);

   Bool    invG  = False;
   IROp    op    = Iop_INVALID;
   void*   hAddr = NULL;
   const HChar*  hName = NULL;
   Bool    eLeft = False;

#  define XXX(_name) do { hAddr = &_name; hName = #_name; } while (0)

   switch (opc) {
      /* Original MMX ones */
      case 0xFC: op = Iop_Add8x8; break;
      case 0xFD: op = Iop_Add16x4; break;
      case 0xFE: op = Iop_Add32x2; break;

      case 0xEC: op = Iop_QAdd8Sx8; break;
      case 0xED: op = Iop_QAdd16Sx4; break;

      case 0xDC: op = Iop_QAdd8Ux8; break;
      case 0xDD: op = Iop_QAdd16Ux4; break;

      case 0xF8: op = Iop_Sub8x8;  break;
      case 0xF9: op = Iop_Sub16x4; break;
      case 0xFA: op = Iop_Sub32x2; break;

      case 0xE8: op = Iop_QSub8Sx8; break;
      case 0xE9: op = Iop_QSub16Sx4; break;

      case 0xD8: op = Iop_QSub8Ux8; break;
      case 0xD9: op = Iop_QSub16Ux4; break;

      case 0xE5: op = Iop_MulHi16Sx4; break;
      case 0xD5: op = Iop_Mul16x4; break;
      case 0xF5: XXX(amd64g_calculate_mmx_pmaddwd); break;

      case 0x74: op = Iop_CmpEQ8x8; break;
      case 0x75: op = Iop_CmpEQ16x4; break;
      case 0x76: op = Iop_CmpEQ32x2; break;

      case 0x64: op = Iop_CmpGT8Sx8; break;
      case 0x65: op = Iop_CmpGT16Sx4; break;
      case 0x66: op = Iop_CmpGT32Sx2; break;

      case 0x6B: op = Iop_QNarrowBin32Sto16Sx4; eLeft = True; break;
      case 0x63: op = Iop_QNarrowBin16Sto8Sx8;  eLeft = True; break;
      case 0x67: op = Iop_QNarrowBin16Sto8Ux8;  eLeft = True; break;

      case 0x68: op = Iop_InterleaveHI8x8;  eLeft = True; break;
      case 0x69: op = Iop_InterleaveHI16x4; eLeft = True; break;
      case 0x6A: op = Iop_InterleaveHI32x2; eLeft = True; break;

      case 0x60: op = Iop_InterleaveLO8x8;  eLeft = True; break;
      case 0x61: op = Iop_InterleaveLO16x4; eLeft = True; break;
      case 0x62: op = Iop_InterleaveLO32x2; eLeft = True; break;

      case 0xDB: op = Iop_And64; break;
      case 0xDF: op = Iop_And64; invG = True; break;
      case 0xEB: op = Iop_Or64; break;
      case 0xEF: /* Possibly do better here if argL and argR are the
                    same reg */
                 op = Iop_Xor64; break;

      /* Introduced in SSE1 */
      case 0xE0: op = Iop_Avg8Ux8;    break;
      case 0xE3: op = Iop_Avg16Ux4;   break;
      case 0xEE: op = Iop_Max16Sx4;   break;
      case 0xDE: op = Iop_Max8Ux8;    break;
      case 0xEA: op = Iop_Min16Sx4;   break;
      case 0xDA: op = Iop_Min8Ux8;    break;
      case 0xE4: op = Iop_MulHi16Ux4; break;
      case 0xF6: XXX(amd64g_calculate_mmx_psadbw); break;

      /* Introduced in SSE2 */
      case 0xD4: op = Iop_Add64; break;
      case 0xFB: op = Iop_Sub64; break;

      default:
         vex_printf("\n0x%x\n", (UInt)opc);
         vpanic("dis_MMXop_regmem_to_reg");
   }

#  undef XXX

   argG = getMMXReg(gregLO3ofRM(modrm));
   if (invG)
      argG = unop(Iop_Not64, argG);

   if (isReg) {
      delta++;
      argE = getMMXReg(eregLO3ofRM(modrm));
   } else {
      Int    len;
      IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
      delta += len;
      argE = loadLE(Ity_I64, mkexpr(addr));
   }

   if (eLeft) {
      argL = argE;
      argR = argG;
   } else {
      argL = argG;
      argR = argE;
   }

   if (op != Iop_INVALID) {
      vassert(hName == NULL);
      vassert(hAddr == NULL);
      assign(res, binop(op, argL, argR));
   } else {
      vassert(hName != NULL);
      vassert(hAddr != NULL);
      assign( res,
              mkIRExprCCall(
                 Ity_I64,
                 0/*regparms*/, hName, hAddr,
                 mkIRExprVec_2( argL, argR )
              )
            );
   }

   putMMXReg( gregLO3ofRM(modrm), mkexpr(res) );

   DIP("%s%s %s, %s\n",
       name, show_granularity ? nameMMXGran(opc & 3) : "",
       ( isReg ? nameMMXReg(eregLO3ofRM(modrm)) : dis_buf ),
       nameMMXReg(gregLO3ofRM(modrm)) );

   return delta;
}


/* Vector by scalar shift of G by the amount specified at the bottom
   of E.  This is a straight copy of dis_SSE_shiftG_byE. */

static ULong dis_MMX_shiftG_byE ( const VexAbiInfo* vbi,
                                  Prefix pfx, Long delta,
                                  const HChar* opname, IROp op )
{
   HChar   dis_buf[50];
   Int     alen, size;
   IRTemp  addr;
   Bool    shl, shr, sar;
   UChar   rm   = getUChar(delta);
   IRTemp  g0   = newTemp(Ity_I64);
   IRTemp  g1   = newTemp(Ity_I64);
   IRTemp  amt  = newTemp(Ity_I64);
   IRTemp  amt8 = newTemp(Ity_I8);

   if (epartIsReg(rm)) {
      assign( amt, getMMXReg(eregLO3ofRM(rm)) );
      DIP("%s %s,%s\n", opname,
                        nameMMXReg(eregLO3ofRM(rm)),
                        nameMMXReg(gregLO3ofRM(rm)) );
      delta++;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( amt, loadLE(Ity_I64, mkexpr(addr)) );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameMMXReg(gregLO3ofRM(rm)) );
      delta += alen;
   }
   assign( g0,   getMMXReg(gregLO3ofRM(rm)) );
   assign( amt8, unop(Iop_64to8, mkexpr(amt)) );

   shl = shr = sar = False;
   size = 0;
   switch (op) {
      case Iop_ShlN16x4: shl = True; size = 32; break;
      case Iop_ShlN32x2: shl = True; size = 32; break;
      case Iop_Shl64:    shl = True; size = 64; break;
      case Iop_ShrN16x4: shr = True; size = 16; break;
      case Iop_ShrN32x2: shr = True; size = 32; break;
      case Iop_Shr64:    shr = True; size = 64; break;
      case Iop_SarN16x4: sar = True; size = 16; break;
      case Iop_SarN32x2: sar = True; size = 32; break;
      default: vassert(0);
   }

   if (shl || shr) {
     assign(
        g1,
        IRExpr_ITE(
           binop(Iop_CmpLT64U,mkexpr(amt),mkU64(size)),
           binop(op, mkexpr(g0), mkexpr(amt8)),
           mkU64(0)
        )
     );
   } else
   if (sar) {
     assign(
        g1,
        IRExpr_ITE(
           binop(Iop_CmpLT64U,mkexpr(amt),mkU64(size)),
           binop(op, mkexpr(g0), mkexpr(amt8)),
           binop(op, mkexpr(g0), mkU8(size-1))
        )
     );
   } else {
      vassert(0);
   }

   putMMXReg( gregLO3ofRM(rm), mkexpr(g1) );
   return delta;
}


/* Vector by scalar shift of E by an immediate byte.  This is a
   straight copy of dis_SSE_shiftE_imm. */

static
ULong dis_MMX_shiftE_imm ( Long delta, const HChar* opname, IROp op )
{
   Bool    shl, shr, sar;
   UChar   rm   = getUChar(delta);
   IRTemp  e0   = newTemp(Ity_I64);
   IRTemp  e1   = newTemp(Ity_I64);
   UChar   amt, size;
   vassert(epartIsReg(rm));
   vassert(gregLO3ofRM(rm) == 2
           || gregLO3ofRM(rm) == 4 || gregLO3ofRM(rm) == 6);
   amt = getUChar(delta+1);
   delta += 2;
   DIP("%s $%d,%s\n", opname,
                      (Int)amt,
                      nameMMXReg(eregLO3ofRM(rm)) );

   assign( e0, getMMXReg(eregLO3ofRM(rm)) );

   shl = shr = sar = False;
   size = 0;
   switch (op) {
      case Iop_ShlN16x4: shl = True; size = 16; break;
      case Iop_ShlN32x2: shl = True; size = 32; break;
      case Iop_Shl64:    shl = True; size = 64; break;
      case Iop_SarN16x4: sar = True; size = 16; break;
      case Iop_SarN32x2: sar = True; size = 32; break;
      case Iop_ShrN16x4: shr = True; size = 16; break;
      case Iop_ShrN32x2: shr = True; size = 32; break;
      case Iop_Shr64:    shr = True; size = 64; break;
      default: vassert(0);
   }

   if (shl || shr) {
     assign( e1, amt >= size
                    ? mkU64(0)
                    : binop(op, mkexpr(e0), mkU8(amt))
     );
   } else
   if (sar) {
     assign( e1, amt >= size
                    ? binop(op, mkexpr(e0), mkU8(size-1))
                    : binop(op, mkexpr(e0), mkU8(amt))
     );
   } else {
      vassert(0);
   }

   putMMXReg( eregLO3ofRM(rm), mkexpr(e1) );
   return delta;
}


/* Completely handle all MMX instructions except emms. */

static
ULong dis_MMX ( Bool* decode_ok,
                const VexAbiInfo* vbi, Prefix pfx, Int sz, Long delta )
{
   Int   len;
   UChar modrm;
   HChar dis_buf[50];
   UChar opc = getUChar(delta);
   delta++;

   /* dis_MMX handles all insns except emms. */
   do_MMX_preamble();

   switch (opc) {

      case 0x6E:
         if (sz == 4) {
            /* MOVD (src)ireg32-or-mem32 (E), (dst)mmxreg (G)*/
            modrm = getUChar(delta);
            if (epartIsReg(modrm)) {
               delta++;
               putMMXReg(
                  gregLO3ofRM(modrm),
                  binop( Iop_32HLto64,
                         mkU32(0),
                         getIReg32(eregOfRexRM(pfx,modrm)) ) );
               DIP("movd %s, %s\n",
                   nameIReg32(eregOfRexRM(pfx,modrm)),
                   nameMMXReg(gregLO3ofRM(modrm)));
            } else {
               IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
               delta += len;
               putMMXReg(
                  gregLO3ofRM(modrm),
                  binop( Iop_32HLto64,
                         mkU32(0),
                         loadLE(Ity_I32, mkexpr(addr)) ) );
               DIP("movd %s, %s\n", dis_buf, nameMMXReg(gregLO3ofRM(modrm)));
            }
         }
         else
         if (sz == 8) {
            /* MOVD (src)ireg64-or-mem64 (E), (dst)mmxreg (G)*/
            modrm = getUChar(delta);
            if (epartIsReg(modrm)) {
               delta++;
               putMMXReg( gregLO3ofRM(modrm),
                          getIReg64(eregOfRexRM(pfx,modrm)) );
               DIP("movd %s, %s\n",
                   nameIReg64(eregOfRexRM(pfx,modrm)),
                   nameMMXReg(gregLO3ofRM(modrm)));
            } else {
               IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
               delta += len;
               putMMXReg( gregLO3ofRM(modrm),
                          loadLE(Ity_I64, mkexpr(addr)) );
               DIP("movd{64} %s, %s\n", dis_buf, nameMMXReg(gregLO3ofRM(modrm)));
            }
         }
         else {
            goto mmx_decode_failure;
         }
         break;

      case 0x7E:
         if (sz == 4) {
            /* MOVD (src)mmxreg (G), (dst)ireg32-or-mem32 (E) */
            modrm = getUChar(delta);
            if (epartIsReg(modrm)) {
               delta++;
               putIReg32( eregOfRexRM(pfx,modrm),
                          unop(Iop_64to32, getMMXReg(gregLO3ofRM(modrm)) ) );
               DIP("movd %s, %s\n",
                   nameMMXReg(gregLO3ofRM(modrm)),
                   nameIReg32(eregOfRexRM(pfx,modrm)));
            } else {
               IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
               delta += len;
               storeLE( mkexpr(addr),
                        unop(Iop_64to32, getMMXReg(gregLO3ofRM(modrm)) ) );
               DIP("movd %s, %s\n", nameMMXReg(gregLO3ofRM(modrm)), dis_buf);
            }
         }
         else
         if (sz == 8) {
            /* MOVD (src)mmxreg (G), (dst)ireg64-or-mem64 (E) */
            modrm = getUChar(delta);
            if (epartIsReg(modrm)) {
               delta++;
               putIReg64( eregOfRexRM(pfx,modrm),
                          getMMXReg(gregLO3ofRM(modrm)) );
               DIP("movd %s, %s\n",
                   nameMMXReg(gregLO3ofRM(modrm)),
                   nameIReg64(eregOfRexRM(pfx,modrm)));
            } else {
               IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
               delta += len;
               storeLE( mkexpr(addr),
                       getMMXReg(gregLO3ofRM(modrm)) );
               DIP("movd{64} %s, %s\n", nameMMXReg(gregLO3ofRM(modrm)), dis_buf);
            }
         } else {
            goto mmx_decode_failure;
         }
         break;

      case 0x6F:
         /* MOVQ (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4
             && /*ignore redundant REX.W*/!(sz==8 && haveNo66noF2noF3(pfx)))
            goto mmx_decode_failure;
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta++;
            putMMXReg( gregLO3ofRM(modrm), getMMXReg(eregLO3ofRM(modrm)) );
            DIP("movq %s, %s\n",
                nameMMXReg(eregLO3ofRM(modrm)),
                nameMMXReg(gregLO3ofRM(modrm)));
         } else {
            IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
            delta += len;
            putMMXReg( gregLO3ofRM(modrm), loadLE(Ity_I64, mkexpr(addr)) );
            DIP("movq %s, %s\n",
                dis_buf, nameMMXReg(gregLO3ofRM(modrm)));
         }
         break;

      case 0x7F:
         /* MOVQ (src)mmxreg, (dst)mmxreg-or-mem */
         if (sz != 4
             && /*ignore redundant REX.W*/!(sz==8 && haveNo66noF2noF3(pfx)))
            goto mmx_decode_failure;
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta++;
            putMMXReg( eregLO3ofRM(modrm), getMMXReg(gregLO3ofRM(modrm)) );
            DIP("movq %s, %s\n",
                nameMMXReg(gregLO3ofRM(modrm)),
                nameMMXReg(eregLO3ofRM(modrm)));
         } else {
            IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
            delta += len;
            storeLE( mkexpr(addr), getMMXReg(gregLO3ofRM(modrm)) );
            DIP("mov(nt)q %s, %s\n",
                nameMMXReg(gregLO3ofRM(modrm)), dis_buf);
         }
         break;

      case 0xFC:
      case 0xFD:
      case 0xFE: /* PADDgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "padd", True );
         break;

      case 0xEC:
      case 0xED: /* PADDSgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4
             && /*ignore redundant REX.W*/!(sz==8 && haveNo66noF2noF3(pfx)))
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "padds", True );
         break;

      case 0xDC:
      case 0xDD: /* PADDUSgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "paddus", True );
         break;

      case 0xF8:
      case 0xF9:
      case 0xFA: /* PSUBgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "psub", True );
         break;

      case 0xE8:
      case 0xE9: /* PSUBSgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "psubs", True );
         break;

      case 0xD8:
      case 0xD9: /* PSUBUSgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "psubus", True );
         break;

      case 0xE5: /* PMULHW (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pmulhw", False );
         break;

      case 0xD5: /* PMULLW (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pmullw", False );
         break;

      case 0xF5: /* PMADDWD (src)mmxreg-or-mem, (dst)mmxreg */
         vassert(sz == 4);
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pmaddwd", False );
         break;

      case 0x74:
      case 0x75:
      case 0x76: /* PCMPEQgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pcmpeq", True );
         break;

      case 0x64:
      case 0x65:
      case 0x66: /* PCMPGTgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pcmpgt", True );
         break;

      case 0x6B: /* PACKSSDW (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "packssdw", False );
         break;

      case 0x63: /* PACKSSWB (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "packsswb", False );
         break;

      case 0x67: /* PACKUSWB (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "packuswb", False );
         break;

      case 0x68:
      case 0x69:
      case 0x6A: /* PUNPCKHgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4
             && /*ignore redundant REX.W*/!(sz==8 && haveNo66noF2noF3(pfx)))
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "punpckh", True );
         break;

      case 0x60:
      case 0x61:
      case 0x62: /* PUNPCKLgg (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4
             && /*ignore redundant REX.W*/!(sz==8 && haveNo66noF2noF3(pfx)))
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "punpckl", True );
         break;

      case 0xDB: /* PAND (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pand", False );
         break;

      case 0xDF: /* PANDN (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pandn", False );
         break;

      case 0xEB: /* POR (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "por", False );
         break;

      case 0xEF: /* PXOR (src)mmxreg-or-mem, (dst)mmxreg */
         if (sz != 4)
            goto mmx_decode_failure;
         delta = dis_MMXop_regmem_to_reg ( vbi, pfx, delta, opc, "pxor", False );
         break;

#     define SHIFT_BY_REG(_name,_op)                                     \
                delta = dis_MMX_shiftG_byE(vbi, pfx, delta, _name, _op); \
                break;

      /* PSLLgg (src)mmxreg-or-mem, (dst)mmxreg */
      case 0xF1: SHIFT_BY_REG("psllw", Iop_ShlN16x4);
      case 0xF2: SHIFT_BY_REG("pslld", Iop_ShlN32x2);
      case 0xF3: SHIFT_BY_REG("psllq", Iop_Shl64);

      /* PSRLgg (src)mmxreg-or-mem, (dst)mmxreg */
      case 0xD1: SHIFT_BY_REG("psrlw", Iop_ShrN16x4);
      case 0xD2: SHIFT_BY_REG("psrld", Iop_ShrN32x2);
      case 0xD3: SHIFT_BY_REG("psrlq", Iop_Shr64);

      /* PSRAgg (src)mmxreg-or-mem, (dst)mmxreg */
      case 0xE1: SHIFT_BY_REG("psraw", Iop_SarN16x4);
      case 0xE2: SHIFT_BY_REG("psrad", Iop_SarN32x2);

#     undef SHIFT_BY_REG

      case 0x71:
      case 0x72:
      case 0x73: {
         /* (sz==4): PSLLgg/PSRAgg/PSRLgg mmxreg by imm8 */
         UChar byte2, subopc;
         if (sz != 4)
            goto mmx_decode_failure;
         byte2  = getUChar(delta);      /* amode / sub-opcode */
         subopc = toUChar( (byte2 >> 3) & 7 );

#        define SHIFT_BY_IMM(_name,_op)                        \
            do { delta = dis_MMX_shiftE_imm(delta,_name,_op);  \
            } while (0)

              if (subopc == 2 /*SRL*/ && opc == 0x71)
                  SHIFT_BY_IMM("psrlw", Iop_ShrN16x4);
         else if (subopc == 2 /*SRL*/ && opc == 0x72)
                 SHIFT_BY_IMM("psrld", Iop_ShrN32x2);
         else if (subopc == 2 /*SRL*/ && opc == 0x73)
                 SHIFT_BY_IMM("psrlq", Iop_Shr64);

         else if (subopc == 4 /*SAR*/ && opc == 0x71)
                 SHIFT_BY_IMM("psraw", Iop_SarN16x4);
         else if (subopc == 4 /*SAR*/ && opc == 0x72)
                 SHIFT_BY_IMM("psrad", Iop_SarN32x2);

         else if (subopc == 6 /*SHL*/ && opc == 0x71)
                 SHIFT_BY_IMM("psllw", Iop_ShlN16x4);
         else if (subopc == 6 /*SHL*/ && opc == 0x72)
                  SHIFT_BY_IMM("pslld", Iop_ShlN32x2);
         else if (subopc == 6 /*SHL*/ && opc == 0x73)
                 SHIFT_BY_IMM("psllq", Iop_Shl64);

         else goto mmx_decode_failure;

#        undef SHIFT_BY_IMM
         break;
      }

      case 0xF7: {
         IRTemp addr    = newTemp(Ity_I64);
         IRTemp regD    = newTemp(Ity_I64);
         IRTemp regM    = newTemp(Ity_I64);
         IRTemp mask    = newTemp(Ity_I64);
         IRTemp olddata = newTemp(Ity_I64);
         IRTemp newdata = newTemp(Ity_I64);

         modrm = getUChar(delta);
         if (sz != 4 || (!epartIsReg(modrm)))
            goto mmx_decode_failure;
         delta++;

         assign( addr, handleAddrOverrides( vbi, pfx, getIReg64(R_RDI) ));
         assign( regM, getMMXReg( eregLO3ofRM(modrm) ));
         assign( regD, getMMXReg( gregLO3ofRM(modrm) ));
         assign( mask, binop(Iop_SarN8x8, mkexpr(regM), mkU8(7)) );
         assign( olddata, loadLE( Ity_I64, mkexpr(addr) ));
         assign( newdata,
                 binop(Iop_Or64,
                       binop(Iop_And64,
                             mkexpr(regD),
                             mkexpr(mask) ),
                       binop(Iop_And64,
                             mkexpr(olddata),
                             unop(Iop_Not64, mkexpr(mask)))) );
         storeLE( mkexpr(addr), mkexpr(newdata) );
         DIP("maskmovq %s,%s\n", nameMMXReg( eregLO3ofRM(modrm) ),
                                 nameMMXReg( gregLO3ofRM(modrm) ) );
         break;
      }

      /* --- MMX decode failure --- */
      default:
      mmx_decode_failure:
         *decode_ok = False;
         return delta; /* ignored */

   }

   *decode_ok = True;
   return delta;
}


/*------------------------------------------------------------*/
/*--- More misc arithmetic and other obscure insns.        ---*/
/*------------------------------------------------------------*/

/* Generate base << amt with vacated places filled with stuff
   from xtra.  amt guaranteed in 0 .. 63. */
static
IRExpr* shiftL64_with_extras ( IRTemp base, IRTemp xtra, IRTemp amt )
{
   /* if   amt == 0
      then base
      else (base << amt) | (xtra >>u (64-amt))
   */
   return
      IRExpr_ITE(
         binop(Iop_CmpNE8, mkexpr(amt), mkU8(0)),
         binop(Iop_Or64,
               binop(Iop_Shl64, mkexpr(base), mkexpr(amt)),
               binop(Iop_Shr64, mkexpr(xtra),
                                binop(Iop_Sub8, mkU8(64), mkexpr(amt)))
               ),
         mkexpr(base)
      );
}

/* Generate base >>u amt with vacated places filled with stuff
   from xtra.  amt guaranteed in 0 .. 63. */
static
IRExpr* shiftR64_with_extras ( IRTemp xtra, IRTemp base, IRTemp amt )
{
   /* if   amt == 0
      then base
      else (base >>u amt) | (xtra << (64-amt))
   */
   return
      IRExpr_ITE(
         binop(Iop_CmpNE8, mkexpr(amt), mkU8(0)),
         binop(Iop_Or64,
               binop(Iop_Shr64, mkexpr(base), mkexpr(amt)),
               binop(Iop_Shl64, mkexpr(xtra),
                                binop(Iop_Sub8, mkU8(64), mkexpr(amt)))
               ),
         mkexpr(base)
      );
}

/* Double length left and right shifts.  Apparently only required in
   v-size (no b- variant). */
static
ULong dis_SHLRD_Gv_Ev ( const VexAbiInfo* vbi,
                        Prefix pfx,
                        Long delta, UChar modrm,
                        Int sz,
                        IRExpr* shift_amt,
                        Bool amt_is_literal,
                        const HChar* shift_amt_txt,
                        Bool left_shift )
{
   /* shift_amt :: Ity_I8 is the amount to shift.  shift_amt_txt is used
      for printing it.   And eip on entry points at the modrm byte. */
   Int len;
   HChar dis_buf[50];

   IRType ty     = szToITy(sz);
   IRTemp gsrc   = newTemp(ty);
   IRTemp esrc   = newTemp(ty);
   IRTemp addr   = IRTemp_INVALID;
   IRTemp tmpSH  = newTemp(Ity_I8);
   IRTemp tmpSS  = newTemp(Ity_I8);
   IRTemp tmp64  = IRTemp_INVALID;
   IRTemp res64  = IRTemp_INVALID;
   IRTemp rss64  = IRTemp_INVALID;
   IRTemp resTy  = IRTemp_INVALID;
   IRTemp rssTy  = IRTemp_INVALID;
   Int    mask   = sz==8 ? 63 : 31;

   vassert(sz == 2 || sz == 4 || sz == 8);

   /* The E-part is the destination; this is shifted.  The G-part
      supplies bits to be shifted into the E-part, but is not
      changed.

      If shifting left, form a double-length word with E at the top
      and G at the bottom, and shift this left.  The result is then in
      the high part.

      If shifting right, form a double-length word with G at the top
      and E at the bottom, and shift this right.  The result is then
      at the bottom.  */

   /* Fetch the operands. */

   assign( gsrc, getIRegG(sz, pfx, modrm) );

   if (epartIsReg(modrm)) {
      delta++;
      assign( esrc, getIRegE(sz, pfx, modrm) );
      DIP("sh%cd%c %s, %s, %s\n",
          ( left_shift ? 'l' : 'r' ), nameISize(sz),
          shift_amt_txt,
          nameIRegG(sz, pfx, modrm), nameIRegE(sz, pfx, modrm));
   } else {
      addr = disAMode ( &len, vbi, pfx, delta, dis_buf,
                        /* # bytes following amode */
                        amt_is_literal ? 1 : 0 );
      delta += len;
      assign( esrc, loadLE(ty, mkexpr(addr)) );
      DIP("sh%cd%c %s, %s, %s\n",
          ( left_shift ? 'l' : 'r' ), nameISize(sz),
          shift_amt_txt,
          nameIRegG(sz, pfx, modrm), dis_buf);
   }

   /* Calculate the masked shift amount (tmpSH), the masked subshift
      amount (tmpSS), the shifted value (res64) and the subshifted
      value (rss64). */

   assign( tmpSH, binop(Iop_And8, shift_amt, mkU8(mask)) );
   assign( tmpSS, binop(Iop_And8,
                        binop(Iop_Sub8, mkexpr(tmpSH), mkU8(1) ),
                        mkU8(mask)));

   tmp64 = newTemp(Ity_I64);
   res64 = newTemp(Ity_I64);
   rss64 = newTemp(Ity_I64);

   if (sz == 2 || sz == 4) {

      /* G is xtra; E is data */
      /* what a freaking nightmare: */
      if (sz == 4 && left_shift) {
         assign( tmp64, binop(Iop_32HLto64, mkexpr(esrc), mkexpr(gsrc)) );
         assign( res64,
                 binop(Iop_Shr64,
                       binop(Iop_Shl64, mkexpr(tmp64), mkexpr(tmpSH)),
                       mkU8(32)) );
         assign( rss64,
                 binop(Iop_Shr64,
                       binop(Iop_Shl64, mkexpr(tmp64), mkexpr(tmpSS)),
                       mkU8(32)) );
      }
      else
      if (sz == 4 && !left_shift) {
         assign( tmp64, binop(Iop_32HLto64, mkexpr(gsrc), mkexpr(esrc)) );
         assign( res64, binop(Iop_Shr64, mkexpr(tmp64), mkexpr(tmpSH)) );
         assign( rss64, binop(Iop_Shr64, mkexpr(tmp64), mkexpr(tmpSS)) );
      }
      else
      if (sz == 2 && left_shift) {
         assign( tmp64,
                 binop(Iop_32HLto64,
                       binop(Iop_16HLto32, mkexpr(esrc), mkexpr(gsrc)),
                       binop(Iop_16HLto32, mkexpr(gsrc), mkexpr(gsrc))
         ));
         /* result formed by shifting [esrc'gsrc'gsrc'gsrc] */
         assign( res64,
                 binop(Iop_Shr64,
                       binop(Iop_Shl64, mkexpr(tmp64), mkexpr(tmpSH)),
                       mkU8(48)) );
         /* subshift formed by shifting [esrc'0000'0000'0000] */
         assign( rss64,
                 binop(Iop_Shr64,
                       binop(Iop_Shl64,
                             binop(Iop_Shl64, unop(Iop_16Uto64, mkexpr(esrc)),
                                              mkU8(48)),
                             mkexpr(tmpSS)),
                       mkU8(48)) );
      }
      else
      if (sz == 2 && !left_shift) {
         assign( tmp64,
                 binop(Iop_32HLto64,
                       binop(Iop_16HLto32, mkexpr(gsrc), mkexpr(gsrc)),
                       binop(Iop_16HLto32, mkexpr(gsrc), mkexpr(esrc))
         ));
         /* result formed by shifting [gsrc'gsrc'gsrc'esrc] */
         assign( res64, binop(Iop_Shr64, mkexpr(tmp64), mkexpr(tmpSH)) );
         /* subshift formed by shifting [0000'0000'0000'esrc] */
         assign( rss64, binop(Iop_Shr64,
                              unop(Iop_16Uto64, mkexpr(esrc)),
                              mkexpr(tmpSS)) );
      }

   } else {

      vassert(sz == 8);
      if (left_shift) {
         assign( res64, shiftL64_with_extras( esrc, gsrc, tmpSH ));
         assign( rss64, shiftL64_with_extras( esrc, gsrc, tmpSS ));
      } else {
         assign( res64, shiftR64_with_extras( gsrc, esrc, tmpSH ));
         assign( rss64, shiftR64_with_extras( gsrc, esrc, tmpSS ));
      }

   }

   resTy = newTemp(ty);
   rssTy = newTemp(ty);
   assign( resTy, narrowTo(ty, mkexpr(res64)) );
   assign( rssTy, narrowTo(ty, mkexpr(rss64)) );

   /* Put result back and write the flags thunk. */
   setFlags_DEP1_DEP2_shift ( left_shift ? Iop_Shl64 : Iop_Sar64,
                              resTy, rssTy, ty, tmpSH );

   if (epartIsReg(modrm)) {
      putIRegE(sz, pfx, modrm, mkexpr(resTy));
   } else {
      storeLE( mkexpr(addr), mkexpr(resTy) );
   }

   if (amt_is_literal) delta++;
   return delta;
}


/* Handle BT/BTS/BTR/BTC Gv, Ev.  Apparently b-size is not
   required. */

typedef enum { BtOpNone, BtOpSet, BtOpReset, BtOpComp } BtOp;

static const HChar* nameBtOp ( BtOp op )
{
   switch (op) {
      case BtOpNone:  return "";
      case BtOpSet:   return "s";
      case BtOpReset: return "r";
      case BtOpComp:  return "c";
      default: vpanic("nameBtOp(amd64)");
   }
}


static
ULong dis_bt_G_E ( const VexAbiInfo* vbi,
                   Prefix pfx, Int sz, Long delta, BtOp op,
                   /*OUT*/Bool* decode_OK )
{
   HChar  dis_buf[50];
   UChar  modrm;
   Int    len;
   IRTemp t_fetched, t_bitno0, t_bitno1, t_bitno2, t_addr0,
          t_addr1, t_rsp, t_mask, t_new;

   vassert(sz == 2 || sz == 4 || sz == 8);

   t_fetched = t_bitno0 = t_bitno1 = t_bitno2
             = t_addr0 = t_addr1 = t_rsp
             = t_mask = t_new = IRTemp_INVALID;

   t_fetched = newTemp(Ity_I8);
   t_new     = newTemp(Ity_I8);
   t_bitno0  = newTemp(Ity_I64);
   t_bitno1  = newTemp(Ity_I64);
   t_bitno2  = newTemp(Ity_I8);
   t_addr1   = newTemp(Ity_I64);
   modrm     = getUChar(delta);

   *decode_OK = True;
   if (epartIsReg(modrm)) {
      /* F2 and F3 are never acceptable. */
      if (haveF2orF3(pfx)) {
         *decode_OK = False;
         return delta;
      }
   } else {
      /* F2 or F3 (but not both) are allowed, provided LOCK is also
         present, and only for the BTC/BTS/BTR cases (not BT). */
      if (haveF2orF3(pfx)) {
         if (haveF2andF3(pfx) || !haveLOCK(pfx) || op == BtOpNone) {
            *decode_OK = False;
            return delta;
         }
      }
   }

   assign( t_bitno0, widenSto64(getIRegG(sz, pfx, modrm)) );

   if (epartIsReg(modrm)) {
      delta++;
      /* Get it onto the client's stack.  Oh, this is a horrible
         kludge.  See https://bugs.kde.org/show_bug.cgi?id=245925.
         Because of the ELF ABI stack redzone, there may be live data
         up to 128 bytes below %RSP.  So we can't just push it on the
         stack, else we may wind up trashing live data, and causing
         impossible-to-find simulation errors.  (Yes, this did
         happen.)  So we need to drop RSP before at least 128 before
         pushing it.  That unfortunately means hitting Memcheck's
         fast-case painting code.  Ideally we should drop more than
         128, to reduce the chances of breaking buggy programs that
         have live data below -128(%RSP).  Memcheck fast-cases moves
         of 288 bytes due to the need to handle ppc64-linux quickly,
         so let's use 288.  Of course the real fix is to get rid of
         this kludge entirely.  */
      t_rsp = newTemp(Ity_I64);
      t_addr0 = newTemp(Ity_I64);

      vassert(vbi->guest_stack_redzone_size == 128);
      assign( t_rsp, binop(Iop_Sub64, getIReg64(R_RSP), mkU64(288)) );
      putIReg64(R_RSP, mkexpr(t_rsp));

      storeLE( mkexpr(t_rsp), getIRegE(sz, pfx, modrm) );

      /* Make t_addr0 point at it. */
      assign( t_addr0, mkexpr(t_rsp) );

      /* Mask out upper bits of the shift amount, since we're doing a
         reg. */
      assign( t_bitno1, binop(Iop_And64,
                              mkexpr(t_bitno0),
                              mkU64(sz == 8 ? 63 : sz == 4 ? 31 : 15)) );

   } else {
      t_addr0 = disAMode ( &len, vbi, pfx, delta, dis_buf, 0 );
      delta += len;
      assign( t_bitno1, mkexpr(t_bitno0) );
   }

   /* At this point: t_addr0 is the address being operated on.  If it
      was a reg, we will have pushed it onto the client's stack.
      t_bitno1 is the bit number, suitably masked in the case of a
      reg.  */

   /* Now the main sequence. */
   assign( t_addr1,
           binop(Iop_Add64,
                 mkexpr(t_addr0),
                 binop(Iop_Sar64, mkexpr(t_bitno1), mkU8(3))) );

   /* t_addr1 now holds effective address */

   assign( t_bitno2,
           unop(Iop_64to8,
                binop(Iop_And64, mkexpr(t_bitno1), mkU64(7))) );

   /* t_bitno2 contains offset of bit within byte */

   if (op != BtOpNone) {
      t_mask = newTemp(Ity_I8);
      assign( t_mask, binop(Iop_Shl8, mkU8(1), mkexpr(t_bitno2)) );
   }

   /* t_mask is now a suitable byte mask */

   assign( t_fetched, loadLE(Ity_I8, mkexpr(t_addr1)) );

   if (op != BtOpNone) {
      switch (op) {
         case BtOpSet:
            assign( t_new,
                    binop(Iop_Or8, mkexpr(t_fetched), mkexpr(t_mask)) );
            break;
         case BtOpComp:
            assign( t_new,
                    binop(Iop_Xor8, mkexpr(t_fetched), mkexpr(t_mask)) );
            break;
         case BtOpReset:
            assign( t_new,
                    binop(Iop_And8, mkexpr(t_fetched),
                                    unop(Iop_Not8, mkexpr(t_mask))) );
            break;
         default:
            vpanic("dis_bt_G_E(amd64)");
      }
      if ((haveLOCK(pfx)) && !epartIsReg(modrm)) {
         casLE( mkexpr(t_addr1), mkexpr(t_fetched)/*expd*/,
                                 mkexpr(t_new)/*new*/,
                                 guest_RIP_curr_instr );
      } else {
         storeLE( mkexpr(t_addr1), mkexpr(t_new) );
      }
   }

   /* Side effect done; now get selected bit into Carry flag */
   /* Flags: C=selected bit, O,S,Z,A,P undefined, so are set to zero. */
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
   stmt( IRStmt_Put(
            OFFB_CC_DEP1,
            binop(Iop_And64,
                  binop(Iop_Shr64,
                        unop(Iop_8Uto64, mkexpr(t_fetched)),
                        mkexpr(t_bitno2)),
                  mkU64(1)))
       );
   /* Set NDEP even though it isn't used.  This makes redundant-PUT
      elimination of previous stores to this field work better. */
   stmt( IRStmt_Put( OFFB_CC_NDEP, mkU64(0) ));

   /* Move reg operand from stack back to reg */
   if (epartIsReg(modrm)) {
      /* t_rsp still points at it. */
      /* only write the reg if actually modifying it; doing otherwise
         zeroes the top half erroneously when doing btl due to
         standard zero-extend rule */
      if (op != BtOpNone)
         putIRegE(sz, pfx, modrm, loadLE(szToITy(sz), mkexpr(t_rsp)) );
      putIReg64(R_RSP, binop(Iop_Add64, mkexpr(t_rsp), mkU64(288)) );
   }

   DIP("bt%s%c %s, %s\n",
       nameBtOp(op), nameISize(sz), nameIRegG(sz, pfx, modrm),
       ( epartIsReg(modrm) ? nameIRegE(sz, pfx, modrm) : dis_buf ) );

   return delta;
}



/* Handle BSF/BSR.  Only v-size seems necessary. */
static
ULong dis_bs_E_G ( const VexAbiInfo* vbi,
                   Prefix pfx, Int sz, Long delta, Bool fwds )
{
   Bool   isReg;
   UChar  modrm;
   HChar  dis_buf[50];

   IRType ty    = szToITy(sz);
   IRTemp src   = newTemp(ty);
   IRTemp dst   = newTemp(ty);
   IRTemp src64 = newTemp(Ity_I64);
   IRTemp dst64 = newTemp(Ity_I64);
   IRTemp srcB  = newTemp(Ity_I1);

   vassert(sz == 8 || sz == 4 || sz == 2);

   modrm = getUChar(delta);
   isReg = epartIsReg(modrm);
   if (isReg) {
      delta++;
      assign( src, getIRegE(sz, pfx, modrm) );
   } else {
      Int    len;
      IRTemp addr = disAMode( &len, vbi, pfx, delta, dis_buf, 0 );
      delta += len;
      assign( src, loadLE(ty, mkexpr(addr)) );
   }

   DIP("bs%c%c %s, %s\n",
       fwds ? 'f' : 'r', nameISize(sz),
       ( isReg ? nameIRegE(sz, pfx, modrm) : dis_buf ),
       nameIRegG(sz, pfx, modrm));

   /* First, widen src to 64 bits if it is not already. */
   assign( src64, widenUto64(mkexpr(src)) );

   /* Generate a bool expression which is zero iff the original is
      zero, and nonzero otherwise.  Ask for a CmpNE version which, if
      instrumented by Memcheck, is instrumented expensively, since
      this may be used on the output of a preceding movmskb insn,
      which has been known to be partially defined, and in need of
      careful handling. */
   assign( srcB, binop(Iop_ExpCmpNE64, mkexpr(src64), mkU64(0)) );

   /* Flags: Z is 1 iff source value is zero.  All others
      are undefined -- we force them to zero. */
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
   stmt( IRStmt_Put(
            OFFB_CC_DEP1,
            IRExpr_ITE( mkexpr(srcB),
                        /* src!=0 */
                        mkU64(0),
                        /* src==0 */
                        mkU64(AMD64G_CC_MASK_Z)
                        )
       ));
   /* Set NDEP even though it isn't used.  This makes redundant-PUT
      elimination of previous stores to this field work better. */
   stmt( IRStmt_Put( OFFB_CC_NDEP, mkU64(0) ));

   /* Result: iff source value is zero, we can't use
      Iop_Clz64/Iop_Ctz64 as they have no defined result in that case.
      But anyway, amd64 semantics say the result is undefined in
      such situations.  Hence handle the zero case specially. */

   /* Bleh.  What we compute:

          bsf64:  if src == 0 then {dst is unchanged}
                              else Ctz64(src)

          bsr64:  if src == 0 then {dst is unchanged}
                              else 63 - Clz64(src)

          bsf32:  if src == 0 then {dst is unchanged}
                              else Ctz64(32Uto64(src))

          bsr32:  if src == 0 then {dst is unchanged}
                              else 63 - Clz64(32Uto64(src))

          bsf16:  if src == 0 then {dst is unchanged}
                              else Ctz64(32Uto64(16Uto32(src)))

          bsr16:  if src == 0 then {dst is unchanged}
                              else 63 - Clz64(32Uto64(16Uto32(src)))
   */

   /* The main computation, guarding against zero. */
   assign( dst64,
           IRExpr_ITE(
              mkexpr(srcB),
              /* src != 0 */
              fwds ? unop(Iop_Ctz64, mkexpr(src64))
                   : binop(Iop_Sub64,
                           mkU64(63),
                           unop(Iop_Clz64, mkexpr(src64))),
              /* src == 0 -- leave dst unchanged */
              widenUto64( getIRegG( sz, pfx, modrm ) )
           )
         );

   if (sz == 2)
      assign( dst, unop(Iop_64to16, mkexpr(dst64)) );
   else
   if (sz == 4)
      assign( dst, unop(Iop_64to32, mkexpr(dst64)) );
   else
      assign( dst, mkexpr(dst64) );

   /* dump result back */
   putIRegG( sz, pfx, modrm, mkexpr(dst) );

   return delta;
}


/* swap rAX with the reg specified by reg and REX.B */
static
void codegen_xchg_rAX_Reg ( Prefix pfx, Int sz, UInt regLo3 )
{
   IRType ty = szToITy(sz);
   IRTemp t1 = newTemp(ty);
   IRTemp t2 = newTemp(ty);
   vassert(sz == 2 || sz == 4 || sz == 8);
   vassert(regLo3 < 8);
   if (sz == 8) {
      assign( t1, getIReg64(R_RAX) );
      assign( t2, getIRegRexB(8, pfx, regLo3) );
      putIReg64( R_RAX, mkexpr(t2) );
      putIRegRexB(8, pfx, regLo3, mkexpr(t1) );
   } else if (sz == 4) {
      assign( t1, getIReg32(R_RAX) );
      assign( t2, getIRegRexB(4, pfx, regLo3) );
      putIReg32( R_RAX, mkexpr(t2) );
      putIRegRexB(4, pfx, regLo3, mkexpr(t1) );
   } else {
      assign( t1, getIReg16(R_RAX) );
      assign( t2, getIRegRexB(2, pfx, regLo3) );
      putIReg16( R_RAX, mkexpr(t2) );
      putIRegRexB(2, pfx, regLo3, mkexpr(t1) );
   }
   DIP("xchg%c %s, %s\n",
       nameISize(sz), nameIRegRAX(sz),
                      nameIRegRexB(sz,pfx, regLo3));
}


static
void codegen_SAHF ( void )
{
   /* Set the flags to:
      (amd64g_calculate_flags_all() & AMD64G_CC_MASK_O)
                                    -- retain the old O flag
      | (%AH & (AMD64G_CC_MASK_S|AMD64G_CC_MASK_Z|AMD64G_CC_MASK_A
                |AMD64G_CC_MASK_P|AMD64G_CC_MASK_C)
   */
   ULong  mask_SZACP = AMD64G_CC_MASK_S|AMD64G_CC_MASK_Z|AMD64G_CC_MASK_A
                       |AMD64G_CC_MASK_C|AMD64G_CC_MASK_P;
   IRTemp oldflags   = newTemp(Ity_I64);
   assign( oldflags, mk_amd64g_calculate_rflags_all() );
   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
   stmt( IRStmt_Put( OFFB_CC_NDEP, mkU64(0) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
   stmt( IRStmt_Put( OFFB_CC_DEP1,
         binop(Iop_Or64,
               binop(Iop_And64, mkexpr(oldflags), mkU64(AMD64G_CC_MASK_O)),
               binop(Iop_And64,
                     binop(Iop_Shr64, getIReg64(R_RAX), mkU8(8)),
                     mkU64(mask_SZACP))
              )
   ));
}


static
void codegen_LAHF ( void  )
{
   /* AH <- EFLAGS(SF:ZF:0:AF:0:PF:1:CF) */
   IRExpr* rax_with_hole;
   IRExpr* new_byte;
   IRExpr* new_rax;
   ULong   mask_SZACP = AMD64G_CC_MASK_S|AMD64G_CC_MASK_Z|AMD64G_CC_MASK_A
                        |AMD64G_CC_MASK_C|AMD64G_CC_MASK_P;

   IRTemp  flags = newTemp(Ity_I64);
   assign( flags, mk_amd64g_calculate_rflags_all() );

   rax_with_hole
      = binop(Iop_And64, getIReg64(R_RAX), mkU64(~0xFF00ULL));
   new_byte
      = binop(Iop_Or64, binop(Iop_And64, mkexpr(flags), mkU64(mask_SZACP)),
                        mkU64(1<<1));
   new_rax
      = binop(Iop_Or64, rax_with_hole,
                        binop(Iop_Shl64, new_byte, mkU8(8)));
   putIReg64(R_RAX, new_rax);
}


static
ULong dis_cmpxchg_G_E ( /*OUT*/Bool* ok,
                        const VexAbiInfo*  vbi,
                        Prefix       pfx,
                        Int          size,
                        Long         delta0 )
{
   HChar dis_buf[50];
   Int   len;

   IRType ty    = szToITy(size);
   IRTemp acc   = newTemp(ty);
   IRTemp src   = newTemp(ty);
   IRTemp dest  = newTemp(ty);
   IRTemp dest2 = newTemp(ty);
   IRTemp acc2  = newTemp(ty);
   IRTemp cond  = newTemp(Ity_I1);
   IRTemp addr  = IRTemp_INVALID;
   UChar  rm    = getUChar(delta0);

   /* There are 3 cases to consider:

      reg-reg: ignore any lock prefix, generate sequence based
               on ITE

      reg-mem, not locked: ignore any lock prefix, generate sequence
                           based on ITE

      reg-mem, locked: use IRCAS
   */

   /* Decide whether F2 or F3 are acceptable.  Never for register
      case, but for the memory case, one or the other is OK provided
      LOCK is also present. */
   if (epartIsReg(rm)) {
      if (haveF2orF3(pfx)) {
         *ok = False;
         return delta0;
      }
   } else {
      if (haveF2orF3(pfx)) {
         if (haveF2andF3(pfx) || !haveLOCK(pfx)) {
            *ok = False;
            return delta0;
         }
      }
   }

   if (epartIsReg(rm)) {
      /* case 1 */
      assign( dest, getIRegE(size, pfx, rm) );
      delta0++;
      assign( src, getIRegG(size, pfx, rm) );
      assign( acc, getIRegRAX(size) );
      setFlags_DEP1_DEP2(Iop_Sub8, acc, dest, ty);
      assign( cond, mk_amd64g_calculate_condition(AMD64CondZ) );
      assign( dest2, IRExpr_ITE(mkexpr(cond), mkexpr(src), mkexpr(dest)) );
      assign( acc2,  IRExpr_ITE(mkexpr(cond), mkexpr(acc), mkexpr(dest)) );
      putIRegRAX(size, mkexpr(acc2));
      putIRegE(size, pfx, rm, mkexpr(dest2));
      DIP("cmpxchg%c %s,%s\n", nameISize(size),
                               nameIRegG(size,pfx,rm),
                               nameIRegE(size,pfx,rm) );
   }
   else if (!epartIsReg(rm) && !haveLOCK(pfx)) {
      /* case 2 */
      addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      assign( dest, loadLE(ty, mkexpr(addr)) );
      delta0 += len;
      assign( src, getIRegG(size, pfx, rm) );
      assign( acc, getIRegRAX(size) );
      setFlags_DEP1_DEP2(Iop_Sub8, acc, dest, ty);
      assign( cond, mk_amd64g_calculate_condition(AMD64CondZ) );
      assign( dest2, IRExpr_ITE(mkexpr(cond), mkexpr(src), mkexpr(dest)) );
      assign( acc2,  IRExpr_ITE(mkexpr(cond), mkexpr(acc), mkexpr(dest)) );
      putIRegRAX(size, mkexpr(acc2));
      storeLE( mkexpr(addr), mkexpr(dest2) );
      DIP("cmpxchg%c %s,%s\n", nameISize(size),
                               nameIRegG(size,pfx,rm), dis_buf);
   }
   else if (!epartIsReg(rm) && haveLOCK(pfx)) {
      /* case 3 */
      /* src is new value.  acc is expected value.  dest is old value.
         Compute success from the output of the IRCAS, and steer the
         new value for RAX accordingly: in case of success, RAX is
         unchanged. */
      addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      delta0 += len;
      assign( src, getIRegG(size, pfx, rm) );
      assign( acc, getIRegRAX(size) );
      stmt( IRStmt_CAS(
         mkIRCAS( IRTemp_INVALID, dest, Iend_LE, mkexpr(addr),
                  NULL, mkexpr(acc), NULL, mkexpr(src) )
      ));
      setFlags_DEP1_DEP2(Iop_Sub8, acc, dest, ty);
      assign( cond, mk_amd64g_calculate_condition(AMD64CondZ) );
      assign( acc2,  IRExpr_ITE(mkexpr(cond), mkexpr(acc), mkexpr(dest)) );
      putIRegRAX(size, mkexpr(acc2));
      DIP("cmpxchg%c %s,%s\n", nameISize(size),
                               nameIRegG(size,pfx,rm), dis_buf);
   }
   else vassert(0);

   *ok = True;
   return delta0;
}


/* Handle conditional move instructions of the form
      cmovcc E(reg-or-mem), G(reg)

   E(src) is reg-or-mem
   G(dst) is reg.

   If E is reg, -->    GET %E, tmps
                       GET %G, tmpd
                       CMOVcc tmps, tmpd
                       PUT tmpd, %G

   If E is mem  -->    (getAddr E) -> tmpa
                       LD (tmpa), tmps
                       GET %G, tmpd
                       CMOVcc tmps, tmpd
                       PUT tmpd, %G
*/
static
ULong dis_cmov_E_G ( const VexAbiInfo* vbi,
                     Prefix        pfx,
                     Int           sz,
                     AMD64Condcode cond,
                     Long          delta0 )
{
   UChar rm  = getUChar(delta0);
   HChar dis_buf[50];
   Int   len;

   IRType ty   = szToITy(sz);
   IRTemp tmps = newTemp(ty);
   IRTemp tmpd = newTemp(ty);

   if (epartIsReg(rm)) {
      assign( tmps, getIRegE(sz, pfx, rm) );
      assign( tmpd, getIRegG(sz, pfx, rm) );

      putIRegG( sz, pfx, rm,
                IRExpr_ITE( mk_amd64g_calculate_condition(cond),
                            mkexpr(tmps),
                            mkexpr(tmpd) )
              );
      DIP("cmov%s %s,%s\n", name_AMD64Condcode(cond),
                            nameIRegE(sz,pfx,rm),
                            nameIRegG(sz,pfx,rm));
      return 1+delta0;
   }

   /* E refers to memory */
   {
      IRTemp addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      assign( tmps, loadLE(ty, mkexpr(addr)) );
      assign( tmpd, getIRegG(sz, pfx, rm) );

      putIRegG( sz, pfx, rm,
                IRExpr_ITE( mk_amd64g_calculate_condition(cond),
                            mkexpr(tmps),
                            mkexpr(tmpd) )
              );

      DIP("cmov%s %s,%s\n", name_AMD64Condcode(cond),
                            dis_buf,
                            nameIRegG(sz,pfx,rm));
      return len+delta0;
   }
}


static
ULong dis_xadd_G_E ( /*OUT*/Bool* decode_ok,
                     const VexAbiInfo* vbi,
                     Prefix pfx, Int sz, Long delta0 )
{
   Int   len;
   UChar rm = getUChar(delta0);
   HChar dis_buf[50];

   IRType ty    = szToITy(sz);
   IRTemp tmpd  = newTemp(ty);
   IRTemp tmpt0 = newTemp(ty);
   IRTemp tmpt1 = newTemp(ty);

   /* There are 3 cases to consider:

      reg-reg: ignore any lock prefix,
               generate 'naive' (non-atomic) sequence

      reg-mem, not locked: ignore any lock prefix, generate 'naive'
                           (non-atomic) sequence

      reg-mem, locked: use IRCAS
   */

   if (epartIsReg(rm)) {
      /* case 1 */
      assign( tmpd, getIRegE(sz, pfx, rm) );
      assign( tmpt0, getIRegG(sz, pfx, rm) );
      assign( tmpt1, binop(mkSizedOp(ty,Iop_Add8),
                           mkexpr(tmpd), mkexpr(tmpt0)) );
      setFlags_DEP1_DEP2( Iop_Add8, tmpd, tmpt0, ty );
      putIRegG(sz, pfx, rm, mkexpr(tmpd));
      putIRegE(sz, pfx, rm, mkexpr(tmpt1));
      DIP("xadd%c %s, %s\n",
          nameISize(sz), nameIRegG(sz,pfx,rm), nameIRegE(sz,pfx,rm));
      *decode_ok = True;
      return 1+delta0;
   }
   else if (!epartIsReg(rm) && !haveLOCK(pfx)) {
      /* case 2 */
      IRTemp addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      assign( tmpd,  loadLE(ty, mkexpr(addr)) );
      assign( tmpt0, getIRegG(sz, pfx, rm) );
      assign( tmpt1, binop(mkSizedOp(ty,Iop_Add8),
                           mkexpr(tmpd), mkexpr(tmpt0)) );
      setFlags_DEP1_DEP2( Iop_Add8, tmpd, tmpt0, ty );
      storeLE( mkexpr(addr), mkexpr(tmpt1) );
      putIRegG(sz, pfx, rm, mkexpr(tmpd));
      DIP("xadd%c %s, %s\n",
          nameISize(sz), nameIRegG(sz,pfx,rm), dis_buf);
      *decode_ok = True;
      return len+delta0;
   }
   else if (!epartIsReg(rm) && haveLOCK(pfx)) {
      /* case 3 */
      IRTemp addr = disAMode ( &len, vbi, pfx, delta0, dis_buf, 0 );
      assign( tmpd,  loadLE(ty, mkexpr(addr)) );
      assign( tmpt0, getIRegG(sz, pfx, rm) );
      assign( tmpt1, binop(mkSizedOp(ty,Iop_Add8),
                           mkexpr(tmpd), mkexpr(tmpt0)) );
      casLE( mkexpr(addr), mkexpr(tmpd)/*expVal*/,
                           mkexpr(tmpt1)/*newVal*/, guest_RIP_curr_instr );
      setFlags_DEP1_DEP2( Iop_Add8, tmpd, tmpt0, ty );
      putIRegG(sz, pfx, rm, mkexpr(tmpd));
      DIP("xadd%c %s, %s\n",
          nameISize(sz), nameIRegG(sz,pfx,rm), dis_buf);
      *decode_ok = True;
      return len+delta0;
   }
   /*UNREACHED*/
   vassert(0);
}

//.. /* Move 16 bits from Ew (ireg or mem) to G (a segment register). */
//..
//.. static
//.. UInt dis_mov_Ew_Sw ( UChar sorb, Long delta0 )
//.. {
//..    Int    len;
//..    IRTemp addr;
//..    UChar  rm  = getUChar(delta0);
//..    HChar  dis_buf[50];
//..
//..    if (epartIsReg(rm)) {
//..       putSReg( gregOfRM(rm), getIReg(2, eregOfRM(rm)) );
//..       DIP("movw %s,%s\n", nameIReg(2,eregOfRM(rm)), nameSReg(gregOfRM(rm)));
//..       return 1+delta0;
//..    } else {
//..       addr = disAMode ( &len, sorb, delta0, dis_buf );
//..       putSReg( gregOfRM(rm), loadLE(Ity_I16, mkexpr(addr)) );
//..       DIP("movw %s,%s\n", dis_buf, nameSReg(gregOfRM(rm)));
//..       return len+delta0;
//..    }
//.. }
//..
//.. /* Move 16 bits from G (a segment register) to Ew (ireg or mem).  If
//..    dst is ireg and sz==4, zero out top half of it.  */
//..
//.. static
//.. UInt dis_mov_Sw_Ew ( UChar sorb,
//..                      Int   sz,
//..                      UInt  delta0 )
//.. {
//..    Int    len;
//..    IRTemp addr;
//..    UChar  rm  = getUChar(delta0);
//..    HChar  dis_buf[50];
//..
//..    vassert(sz == 2 || sz == 4);
//..
//..    if (epartIsReg(rm)) {
//..       if (sz == 4)
//..          putIReg(4, eregOfRM(rm), unop(Iop_16Uto32, getSReg(gregOfRM(rm))));
//..       else
//..          putIReg(2, eregOfRM(rm), getSReg(gregOfRM(rm)));
//..
//..       DIP("mov %s,%s\n", nameSReg(gregOfRM(rm)), nameIReg(sz,eregOfRM(rm)));
//..       return 1+delta0;
//..    } else {
//..       addr = disAMode ( &len, sorb, delta0, dis_buf );
//..       storeLE( mkexpr(addr), getSReg(gregOfRM(rm)) );
//..       DIP("mov %s,%s\n", nameSReg(gregOfRM(rm)), dis_buf);
//..       return len+delta0;
//..    }
//.. }

/* Handle move instructions of the form
      mov S, E  meaning
      mov sreg, reg-or-mem
   Is passed the a ptr to the modRM byte, and the data size.  Returns
   the address advanced completely over this instruction.

   VEX does not currently simulate segment registers on AMD64 which means that
   instead of moving a value of a segment register, zero is moved to the
   destination.  The zero value represents a null (unused) selector.  This is
   not correct (especially for the %cs, %fs and %gs registers) but it seems to
   provide a sufficient simulation for currently seen programs that use this
   instruction.  If some program actually decides to use the obtained segment
   selector for something meaningful then the zero value should be a clear
   indicator that there is some problem.

   S(src) is sreg.
   E(dst) is reg-or-mem

   If E is reg, -->    PUT $0, %E

   If E is mem, -->    (getAddr E) -> tmpa
                       ST $0, (tmpa)
*/
static
ULong dis_mov_S_E ( const VexAbiInfo* vbi,
                    Prefix      pfx,
                    Int         size,
                    Long        delta0 )
{
   Int   len;
   UChar rm = getUChar(delta0);
   HChar dis_buf[50];

   if (epartIsReg(rm)) {
      putIRegE(size, pfx, rm, mkU(szToITy(size), 0));
      DIP("mov %s,%s\n", nameSReg(gregOfRexRM(pfx, rm)),
                         nameIRegE(size, pfx, rm));
      return 1+delta0;
   }

   /* E refers to memory */
   {
      IRTemp addr = disAMode(&len, vbi, pfx, delta0, dis_buf, 0);
      storeLE(mkexpr(addr), mkU16(0));
      DIP("mov %s,%s\n", nameSReg(gregOfRexRM(pfx, rm)),
                         dis_buf);
      return len+delta0;
   }
}

//.. static
//.. void dis_push_segreg ( UInt sreg, Int sz )
//.. {
//..     IRTemp t1 = newTemp(Ity_I16);
//..     IRTemp ta = newTemp(Ity_I32);
//..     vassert(sz == 2 || sz == 4);
//..
//..     assign( t1, getSReg(sreg) );
//..     assign( ta, binop(Iop_Sub32, getIReg(4, R_ESP), mkU32(sz)) );
//..     putIReg(4, R_ESP, mkexpr(ta));
//..     storeLE( mkexpr(ta), mkexpr(t1) );
//..
//..     DIP("pushw %s\n", nameSReg(sreg));
//.. }
//..
//.. static
//.. void dis_pop_segreg ( UInt sreg, Int sz )
//.. {
//..     IRTemp t1 = newTemp(Ity_I16);
//..     IRTemp ta = newTemp(Ity_I32);
//..     vassert(sz == 2 || sz == 4);
//..
//..     assign( ta, getIReg(4, R_ESP) );
//..     assign( t1, loadLE(Ity_I16, mkexpr(ta)) );
//..
//..     putIReg(4, R_ESP, binop(Iop_Add32, mkexpr(ta), mkU32(sz)) );
//..     putSReg( sreg, mkexpr(t1) );
//..     DIP("pop %s\n", nameSReg(sreg));
//.. }

static
void dis_ret ( /*MOD*/DisResult* dres, const VexAbiInfo* vbi, ULong d64 )
{
   IRTemp t1 = newTemp(Ity_I64);
   IRTemp t2 = newTemp(Ity_I64);
   IRTemp t3 = newTemp(Ity_I64);
   assign(t1, getIReg64(R_RSP));
   assign(t2, loadLE(Ity_I64,mkexpr(t1)));
   assign(t3, binop(Iop_Add64, mkexpr(t1), mkU64(8+d64)));
   putIReg64(R_RSP, mkexpr(t3));
   make_redzone_AbiHint(vbi, t3, t2/*nia*/, "ret");
   jmp_treg(dres, Ijk_Ret, t2);
   vassert(dres->whatNext == Dis_StopHere);
}


/*------------------------------------------------------------*/
/*--- SSE/SSE2/SSE3 helpers                                ---*/
/*------------------------------------------------------------*/

/* Indicates whether the op requires a rounding-mode argument.  Note
   that this covers only vector floating point arithmetic ops, and
   omits the scalar ones that need rounding modes.  Note also that
   inconsistencies here will get picked up later by the IR sanity
   checker, so this isn't correctness-critical. */
static Bool requiresRMode ( IROp op )
{
   switch (op) {
      /* 128 bit ops */
      case Iop_Add32Fx4: case Iop_Sub32Fx4:
      case Iop_Mul32Fx4: case Iop_Div32Fx4:
      case Iop_Add64Fx2: case Iop_Sub64Fx2:
      case Iop_Mul64Fx2: case Iop_Div64Fx2:
      /* 256 bit ops */
      case Iop_Add32Fx8: case Iop_Sub32Fx8:
      case Iop_Mul32Fx8: case Iop_Div32Fx8:
      case Iop_Add64Fx4: case Iop_Sub64Fx4:
      case Iop_Mul64Fx4: case Iop_Div64Fx4:
         return True;
      default:
         break;
   }
   return False;
}


/* Worker function; do not call directly.
   Handles full width G = G `op` E   and   G = (not G) `op` E.
*/

static ULong dis_SSE_E_to_G_all_wrk (
                const VexAbiInfo* vbi,
                Prefix pfx, Long delta,
                const HChar* opname, IROp op,
                Bool   invertG
             )
{
   HChar   dis_buf[50];
   Int     alen;
   IRTemp  addr;
   UChar   rm = getUChar(delta);
   Bool    needsRMode = requiresRMode(op);
   IRExpr* gpart
      = invertG ? unop(Iop_NotV128, getXMMReg(gregOfRexRM(pfx,rm)))
                : getXMMReg(gregOfRexRM(pfx,rm));
   if (epartIsReg(rm)) {
      putXMMReg(
         gregOfRexRM(pfx,rm),
         needsRMode
            ? triop(op, get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        gpart,
                        getXMMReg(eregOfRexRM(pfx,rm)))
            : binop(op, gpart,
                        getXMMReg(eregOfRexRM(pfx,rm)))
      );
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+1;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      putXMMReg(
         gregOfRexRM(pfx,rm),
         needsRMode
            ? triop(op, get_FAKE_roundingmode(), /* XXXROUNDINGFIXME */
                        gpart,
                        loadLE(Ity_V128, mkexpr(addr)))
            : binop(op, gpart,
                        loadLE(Ity_V128, mkexpr(addr)))
      );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+alen;
   }
}


/* All lanes SSE binary operation, G = G `op` E. */

static
ULong dis_SSE_E_to_G_all ( const VexAbiInfo* vbi,
                           Prefix pfx, Long delta,
                           const HChar* opname, IROp op )
{
   return dis_SSE_E_to_G_all_wrk( vbi, pfx, delta, opname, op, False );
}

/* All lanes SSE binary operation, G = (not G) `op` E. */

static
ULong dis_SSE_E_to_G_all_invG ( const VexAbiInfo* vbi,
                                Prefix pfx, Long delta,
                                const HChar* opname, IROp op )
{
   return dis_SSE_E_to_G_all_wrk( vbi, pfx, delta, opname, op, True );
}


/* Lowest 32-bit lane only SSE binary operation, G = G `op` E. */

static ULong dis_SSE_E_to_G_lo32 ( const VexAbiInfo* vbi,
                                   Prefix pfx, Long delta,
                                   const HChar* opname, IROp op )
{
   HChar   dis_buf[50];
   Int     alen;
   IRTemp  addr;
   UChar   rm = getUChar(delta);
   IRExpr* gpart = getXMMReg(gregOfRexRM(pfx,rm));
   if (epartIsReg(rm)) {
      putXMMReg( gregOfRexRM(pfx,rm),
                 binop(op, gpart,
                           getXMMReg(eregOfRexRM(pfx,rm))) );
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+1;
   } else {
      /* We can only do a 32-bit memory read, so the upper 3/4 of the
         E operand needs to be made simply of zeroes. */
      IRTemp epart = newTemp(Ity_V128);
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( epart, unop( Iop_32UtoV128,
                           loadLE(Ity_I32, mkexpr(addr))) );
      putXMMReg( gregOfRexRM(pfx,rm),
                 binop(op, gpart, mkexpr(epart)) );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+alen;
   }
}


/* Lower 64-bit lane only SSE binary operation, G = G `op` E. */

static ULong dis_SSE_E_to_G_lo64 ( const VexAbiInfo* vbi,
                                   Prefix pfx, Long delta,
                                   const HChar* opname, IROp op )
{
   HChar   dis_buf[50];
   Int     alen;
   IRTemp  addr;
   UChar   rm = getUChar(delta);
   IRExpr* gpart = getXMMReg(gregOfRexRM(pfx,rm));
   if (epartIsReg(rm)) {
      putXMMReg( gregOfRexRM(pfx,rm),
                 binop(op, gpart,
                           getXMMReg(eregOfRexRM(pfx,rm))) );
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+1;
   } else {
      /* We can only do a 64-bit memory read, so the upper half of the
         E operand needs to be made simply of zeroes. */
      IRTemp epart = newTemp(Ity_V128);
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( epart, unop( Iop_64UtoV128,
                           loadLE(Ity_I64, mkexpr(addr))) );
      putXMMReg( gregOfRexRM(pfx,rm),
                 binop(op, gpart, mkexpr(epart)) );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+alen;
   }
}


/* All lanes unary SSE operation, G = op(E). */

static ULong dis_SSE_E_to_G_unary_all (
                const VexAbiInfo* vbi,
                Prefix pfx, Long delta,
                const HChar* opname, IROp op
             )
{
   HChar   dis_buf[50];
   Int     alen;
   IRTemp  addr;
   UChar   rm = getUChar(delta);
   // Sqrt32Fx4 and Sqrt64Fx2 take a rounding mode, which is faked
   // up in the usual way.
   Bool needsIRRM = op == Iop_Sqrt32Fx4 || op == Iop_Sqrt64Fx2;
   if (epartIsReg(rm)) {
      IRExpr* src = getXMMReg(eregOfRexRM(pfx,rm));
      /* XXXROUNDINGFIXME */
      IRExpr* res = needsIRRM ? binop(op, get_FAKE_roundingmode(), src)
                              : unop(op, src);
      putXMMReg( gregOfRexRM(pfx,rm), res );
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+1;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      IRExpr* src = loadLE(Ity_V128, mkexpr(addr));
      /* XXXROUNDINGFIXME */
      IRExpr* res = needsIRRM ? binop(op, get_FAKE_roundingmode(), src)
                              : unop(op, src);
      putXMMReg( gregOfRexRM(pfx,rm), res );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+alen;
   }
}


/* Lowest 32-bit lane only unary SSE operation, G = op(E). */

static ULong dis_SSE_E_to_G_unary_lo32 (
                const VexAbiInfo* vbi,
                Prefix pfx, Long delta,
                const HChar* opname, IROp op
             )
{
   /* First we need to get the old G value and patch the low 32 bits
      of the E operand into it.  Then apply op and write back to G. */
   HChar   dis_buf[50];
   Int     alen;
   IRTemp  addr;
   UChar   rm = getUChar(delta);
   IRTemp  oldG0 = newTemp(Ity_V128);
   IRTemp  oldG1 = newTemp(Ity_V128);

   assign( oldG0, getXMMReg(gregOfRexRM(pfx,rm)) );

   if (epartIsReg(rm)) {
      assign( oldG1,
              binop( Iop_SetV128lo32,
                     mkexpr(oldG0),
                     getXMMRegLane32(eregOfRexRM(pfx,rm), 0)) );
      putXMMReg( gregOfRexRM(pfx,rm), unop(op, mkexpr(oldG1)) );
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+1;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( oldG1,
              binop( Iop_SetV128lo32,
                     mkexpr(oldG0),
                     loadLE(Ity_I32, mkexpr(addr)) ));
      putXMMReg( gregOfRexRM(pfx,rm), unop(op, mkexpr(oldG1)) );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+alen;
   }
}


/* Lowest 64-bit lane only unary SSE operation, G = op(E). */

static ULong dis_SSE_E_to_G_unary_lo64 (
                const VexAbiInfo* vbi,
                Prefix pfx, Long delta,
                const HChar* opname, IROp op
             )
{
   /* First we need to get the old G value and patch the low 64 bits
      of the E operand into it.  Then apply op and write back to G. */
   HChar   dis_buf[50];
   Int     alen;
   IRTemp  addr;
   UChar   rm = getUChar(delta);
   IRTemp  oldG0 = newTemp(Ity_V128);
   IRTemp  oldG1 = newTemp(Ity_V128);

   assign( oldG0, getXMMReg(gregOfRexRM(pfx,rm)) );

   if (epartIsReg(rm)) {
      assign( oldG1,
              binop( Iop_SetV128lo64,
                     mkexpr(oldG0),
                     getXMMRegLane64(eregOfRexRM(pfx,rm), 0)) );
      putXMMReg( gregOfRexRM(pfx,rm), unop(op, mkexpr(oldG1)) );
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+1;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( oldG1,
              binop( Iop_SetV128lo64,
                     mkexpr(oldG0),
                     loadLE(Ity_I64, mkexpr(addr)) ));
      putXMMReg( gregOfRexRM(pfx,rm), unop(op, mkexpr(oldG1)) );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      return delta+alen;
   }
}


/* SSE integer binary operation:
      G = G `op` E   (eLeft == False)
      G = E `op` G   (eLeft == True)
*/
static ULong dis_SSEint_E_to_G(
                const VexAbiInfo* vbi,
                Prefix pfx, Long delta,
                const HChar* opname, IROp op,
                Bool   eLeft
             )
{
   HChar   dis_buf[50];
   Int     alen;
   IRTemp  addr;
   UChar   rm = getUChar(delta);
   IRExpr* gpart = getXMMReg(gregOfRexRM(pfx,rm));
   IRExpr* epart = NULL;
   if (epartIsReg(rm)) {
      epart = getXMMReg(eregOfRexRM(pfx,rm));
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      delta += 1;
   } else {
      addr  = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      epart = loadLE(Ity_V128, mkexpr(addr));
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      delta += alen;
   }
   putXMMReg( gregOfRexRM(pfx,rm),
              eLeft ? binop(op, epart, gpart)
                    : binop(op, gpart, epart) );
   return delta;
}


/* Helper for doing SSE FP comparisons.  False return ==> unhandled.
   This is all a bit of a kludge in that it ignores the subtleties of
   ordered-vs-unordered and signalling-vs-nonsignalling in the Intel
   spec. */
static Bool findSSECmpOp ( /*OUT*/Bool* preSwapP,
                           /*OUT*/IROp* opP,
                           /*OUT*/Bool* postNotP,
                           UInt imm8, Bool all_lanes, Int sz )
{
   if (imm8 >= 32) return False;

   /* First, compute a (preSwap, op, postNot) triple from
      the supplied imm8. */
   Bool pre = False;
   IROp op  = Iop_INVALID;
   Bool not = False;

#  define XXX(_pre, _op, _not) { pre = _pre; op = _op; not = _not; }
   // If you add a case here, add a corresponding test for both VCMPSD_128
   // and VCMPSS_128 in avx-1.c.
   // Cases 0xA and above are
   //    "Enhanced Comparison Predicate[s] for VEX-Encoded [insns]"
   switch (imm8) {
      // "O" = ordered, "U" = unordered
      // "Q" = non-signalling (quiet), "S" = signalling
      //
      //             swap operands?
      //             |
      //             |      cmp op          invert after?
      //             |      |               |
      //             v      v               v
      case 0x0:  XXX(False, Iop_CmpEQ32Fx4, False); break; // EQ_OQ
      case 0x8:  XXX(False, Iop_CmpEQ32Fx4, False); break; // EQ_UQ
      case 0x10: XXX(False, Iop_CmpEQ32Fx4, False); break; // EQ_OS
      case 0x18: XXX(False, Iop_CmpEQ32Fx4, False); break; // EQ_US
      //
      case 0x1:  XXX(False, Iop_CmpLT32Fx4, False); break; // LT_OS
      case 0x11: XXX(False, Iop_CmpLT32Fx4, False); break; // LT_OQ
      //
      case 0x2:  XXX(False, Iop_CmpLE32Fx4, False); break; // LE_OS
      case 0x12: XXX(False, Iop_CmpLE32Fx4, False); break; // LE_OQ
      //
      case 0x3:  XXX(False, Iop_CmpUN32Fx4, False); break; // UNORD_Q
      case 0x13: XXX(False, Iop_CmpUN32Fx4, False); break; // UNORD_S
      //
      // 0xC: this isn't really right because it returns all-1s when
      // either operand is a NaN, and it should return all-0s.
      case 0x4:  XXX(False, Iop_CmpEQ32Fx4, True);  break; // NEQ_UQ
      case 0xC:  XXX(False, Iop_CmpEQ32Fx4, True);  break; // NEQ_OQ
      case 0x14: XXX(False, Iop_CmpEQ32Fx4, True);  break; // NEQ_US
      case 0x1C: XXX(False, Iop_CmpEQ32Fx4, True);  break; // NEQ_OS
      //
      case 0x5:  XXX(False, Iop_CmpLT32Fx4, True);  break; // NLT_US
      case 0x15: XXX(False, Iop_CmpLT32Fx4, True);  break; // NLT_UQ
      //
      case 0x6:  XXX(False, Iop_CmpLE32Fx4, True);  break; // NLE_US
      case 0x16: XXX(False, Iop_CmpLE32Fx4, True);  break; // NLE_UQ
      //
      case 0x7:  XXX(False, Iop_CmpUN32Fx4, True);  break; // ORD_Q
      case 0x17: XXX(False, Iop_CmpUN32Fx4, True);  break; // ORD_S
      //
      case 0x9:  XXX(True,  Iop_CmpLE32Fx4, True);  break; // NGE_US
      case 0x19: XXX(True,  Iop_CmpLE32Fx4, True);  break; // NGE_UQ
      //
      case 0xA:  XXX(True,  Iop_CmpLT32Fx4, True);  break; // NGT_US
      case 0x1A: XXX(True,  Iop_CmpLT32Fx4, True);  break; // NGT_UQ
      //
      case 0xD:  XXX(True,  Iop_CmpLE32Fx4, False); break; // GE_OS
      case 0x1D: XXX(True,  Iop_CmpLE32Fx4, False); break; // GE_OQ
      //
      case 0xE:  XXX(True,  Iop_CmpLT32Fx4, False); break; // GT_OS
      case 0x1E: XXX(True,  Iop_CmpLT32Fx4, False); break; // GT_OQ
      // Unhandled:
      // 0xB  FALSE_OQ
      // 0xF  TRUE_UQ
      // 0x1B  FALSE_OS
      // 0x1F  TRUE_US
      /* Don't forget to add test cases to VCMPSS_128_<imm8> in
         avx-1.c if new cases turn up. */
      default: break;
   }
#  undef XXX
   if (op == Iop_INVALID) return False;

   /* Now convert the op into one with the same arithmetic but that is
      correct for the width and laneage requirements. */

   /**/ if (sz == 4 && all_lanes) {
      switch (op) {
         case Iop_CmpEQ32Fx4: op = Iop_CmpEQ32Fx4; break;
         case Iop_CmpLT32Fx4: op = Iop_CmpLT32Fx4; break;
         case Iop_CmpLE32Fx4: op = Iop_CmpLE32Fx4; break;
         case Iop_CmpUN32Fx4: op = Iop_CmpUN32Fx4; break;
         default: vassert(0);
      }
   }
   else if (sz == 4 && !all_lanes) {
      switch (op) {
         case Iop_CmpEQ32Fx4: op = Iop_CmpEQ32F0x4; break;
         case Iop_CmpLT32Fx4: op = Iop_CmpLT32F0x4; break;
         case Iop_CmpLE32Fx4: op = Iop_CmpLE32F0x4; break;
         case Iop_CmpUN32Fx4: op = Iop_CmpUN32F0x4; break;
         default: vassert(0);
      }
   }
   else if (sz == 8 && all_lanes) {
      switch (op) {
         case Iop_CmpEQ32Fx4: op = Iop_CmpEQ64Fx2; break;
         case Iop_CmpLT32Fx4: op = Iop_CmpLT64Fx2; break;
         case Iop_CmpLE32Fx4: op = Iop_CmpLE64Fx2; break;
         case Iop_CmpUN32Fx4: op = Iop_CmpUN64Fx2; break;
         default: vassert(0);
      }
   }
   else if (sz == 8 && !all_lanes) {
      switch (op) {
         case Iop_CmpEQ32Fx4: op = Iop_CmpEQ64F0x2; break;
         case Iop_CmpLT32Fx4: op = Iop_CmpLT64F0x2; break;
         case Iop_CmpLE32Fx4: op = Iop_CmpLE64F0x2; break;
         case Iop_CmpUN32Fx4: op = Iop_CmpUN64F0x2; break;
         default: vassert(0);
      }
   }
   else {
      vpanic("findSSECmpOp(amd64,guest)");
   }

   *preSwapP = pre; *opP = op; *postNotP = not;
   return True;
}


/* Handles SSE 32F/64F comparisons.  It can fail, in which case it
   returns the original delta to indicate failure. */

static Long dis_SSE_cmp_E_to_G ( const VexAbiInfo* vbi,
                                 Prefix pfx, Long delta,
                                 const HChar* opname, Bool all_lanes, Int sz )
{
   Long    delta0 = delta;
   HChar   dis_buf[50];
   Int     alen;
   UInt    imm8;
   IRTemp  addr;
   Bool    preSwap = False;
   IROp    op      = Iop_INVALID;
   Bool    postNot = False;
   IRTemp  plain   = newTemp(Ity_V128);
   UChar   rm      = getUChar(delta);
   UShort  mask    = 0;
   vassert(sz == 4 || sz == 8);
   if (epartIsReg(rm)) {
      imm8 = getUChar(delta+1);
      if (imm8 >= 8) return delta0; /* FAIL */
      Bool ok = findSSECmpOp(&preSwap, &op, &postNot, imm8, all_lanes, sz);
      if (!ok) return delta0; /* FAIL */
      vassert(!preSwap); /* never needed for imm8 < 8 */
      assign( plain, binop(op, getXMMReg(gregOfRexRM(pfx,rm)),
                               getXMMReg(eregOfRexRM(pfx,rm))) );
      delta += 2;
      DIP("%s $%u,%s,%s\n", opname,
                            imm8,
                            nameXMMReg(eregOfRexRM(pfx,rm)),
                            nameXMMReg(gregOfRexRM(pfx,rm)) );
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 1 );
      imm8 = getUChar(delta+alen);
      if (imm8 >= 8) return delta0; /* FAIL */
      Bool ok = findSSECmpOp(&preSwap, &op, &postNot, imm8, all_lanes, sz);
      if (!ok) return delta0; /* FAIL */
      vassert(!preSwap); /* never needed for imm8 < 8 */
      assign( plain,
              binop(
                 op,
                 getXMMReg(gregOfRexRM(pfx,rm)),
                   all_lanes
                      ? loadLE(Ity_V128, mkexpr(addr))
                   : sz == 8
                      ? unop( Iop_64UtoV128, loadLE(Ity_I64, mkexpr(addr)))
                   : /*sz==4*/
                      unop( Iop_32UtoV128, loadLE(Ity_I32, mkexpr(addr)))
              )
      );
      delta += alen+1;
      DIP("%s $%u,%s,%s\n", opname,
                            imm8,
                            dis_buf,
                            nameXMMReg(gregOfRexRM(pfx,rm)) );
   }

   if (postNot && all_lanes) {
      putXMMReg( gregOfRexRM(pfx,rm),
                 unop(Iop_NotV128, mkexpr(plain)) );
   }
   else
   if (postNot && !all_lanes) {
      mask = toUShort(sz==4 ? 0x000F : 0x00FF);
      putXMMReg( gregOfRexRM(pfx,rm),
                 binop(Iop_XorV128, mkexpr(plain), mkV128(mask)) );
   }
   else {
      putXMMReg( gregOfRexRM(pfx,rm), mkexpr(plain) );
   }

   return delta;
}


/* Vector by scalar shift of G by the amount specified at the bottom
   of E. */

static ULong dis_SSE_shiftG_byE ( const VexAbiInfo* vbi,
                                  Prefix pfx, Long delta,
                                  const HChar* opname, IROp op )
{
   HChar   dis_buf[50];
   Int     alen, size;
   IRTemp  addr;
   Bool    shl, shr, sar;
   UChar   rm   = getUChar(delta);
   IRTemp  g0   = newTemp(Ity_V128);
   IRTemp  g1   = newTemp(Ity_V128);
   IRTemp  amt  = newTemp(Ity_I64);
   IRTemp  amt8 = newTemp(Ity_I8);
   if (epartIsReg(rm)) {
      assign( amt, getXMMRegLane64(eregOfRexRM(pfx,rm), 0) );
      DIP("%s %s,%s\n", opname,
                        nameXMMReg(eregOfRexRM(pfx,rm)),
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      delta++;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( amt, loadLE(Ity_I64, mkexpr(addr)) );
      DIP("%s %s,%s\n", opname,
                        dis_buf,
                        nameXMMReg(gregOfRexRM(pfx,rm)) );
      delta += alen;
   }
   assign( g0,   getXMMReg(gregOfRexRM(pfx,rm)) );
   assign( amt8, unop(Iop_64to8, mkexpr(amt)) );

   shl = shr = sar = False;
   size = 0;
   switch (op) {
      case Iop_ShlN16x8: shl = True; size = 32; break;
      case Iop_ShlN32x4: shl = True; size = 32; break;
      case Iop_ShlN64x2: shl = True; size = 64; break;
      case Iop_SarN16x8: sar = True; size = 16; break;
      case Iop_SarN32x4: sar = True; size = 32; break;
      case Iop_ShrN16x8: shr = True; size = 16; break;
      case Iop_ShrN32x4: shr = True; size = 32; break;
      case Iop_ShrN64x2: shr = True; size = 64; break;
      default: vassert(0);
   }

   if (shl || shr) {
     assign(
        g1,
        IRExpr_ITE(
           binop(Iop_CmpLT64U, mkexpr(amt), mkU64(size)),
           binop(op, mkexpr(g0), mkexpr(amt8)),
           mkV128(0x0000)
        )
     );
   } else
   if (sar) {
     assign(
        g1,
        IRExpr_ITE(
           binop(Iop_CmpLT64U, mkexpr(amt), mkU64(size)),
           binop(op, mkexpr(g0), mkexpr(amt8)),
           binop(op, mkexpr(g0), mkU8(size-1))
        )
     );
   } else {
      vassert(0);
   }

   putXMMReg( gregOfRexRM(pfx,rm), mkexpr(g1) );
   return delta;
}


/* Vector by scalar shift of E by an immediate byte. */

static
ULong dis_SSE_shiftE_imm ( Prefix pfx,
                           Long delta, const HChar* opname, IROp op )
{
   Bool    shl, shr, sar;
   UChar   rm   = getUChar(delta);
   IRTemp  e0   = newTemp(Ity_V128);
   IRTemp  e1   = newTemp(Ity_V128);
   UChar   amt, size;
   vassert(epartIsReg(rm));
   vassert(gregLO3ofRM(rm) == 2
           || gregLO3ofRM(rm) == 4 || gregLO3ofRM(rm) == 6);
   amt = getUChar(delta+1);
   delta += 2;
   DIP("%s $%d,%s\n", opname,
                      (Int)amt,
                      nameXMMReg(eregOfRexRM(pfx,rm)) );
   assign( e0, getXMMReg(eregOfRexRM(pfx,rm)) );

   shl = shr = sar = False;
   size = 0;
   switch (op) {
      case Iop_ShlN16x8: shl = True; size = 16; break;
      case Iop_ShlN32x4: shl = True; size = 32; break;
      case Iop_ShlN64x2: shl = True; size = 64; break;
      case Iop_SarN16x8: sar = True; size = 16; break;
      case Iop_SarN32x4: sar = True; size = 32; break;
      case Iop_ShrN16x8: shr = True; size = 16; break;
      case Iop_ShrN32x4: shr = True; size = 32; break;
      case Iop_ShrN64x2: shr = True; size = 64; break;
      default: vassert(0);
   }

   if (shl || shr) {
     assign( e1, amt >= size
                    ? mkV128(0x0000)
                    : binop(op, mkexpr(e0), mkU8(amt))
     );
   } else
   if (sar) {
     assign( e1, amt >= size
                    ? binop(op, mkexpr(e0), mkU8(size-1))
                    : binop(op, mkexpr(e0), mkU8(amt))
     );
   } else {
      vassert(0);
   }

   putXMMReg( eregOfRexRM(pfx,rm), mkexpr(e1) );
   return delta;
}


/* Get the current SSE rounding mode. */

static IRExpr* /* :: Ity_I32 */ get_sse_roundingmode ( void )
{
   return
      unop( Iop_64to32,
            binop( Iop_And64,
                   IRExpr_Get( OFFB_SSEROUND, Ity_I64 ),
                   mkU64(3) ));
}

static void put_sse_roundingmode ( IRExpr* sseround )
{
   vassert(typeOfIRExpr(irsb->tyenv, sseround) == Ity_I32);
   stmt( IRStmt_Put( OFFB_SSEROUND,
                     unop(Iop_32Uto64,sseround) ) );
}

/* Break a V128-bit value up into four 32-bit ints. */

static void breakupV128to32s ( IRTemp t128,
                               /*OUTs*/
                               IRTemp* t3, IRTemp* t2,
                               IRTemp* t1, IRTemp* t0 )
{
   IRTemp hi64 = newTemp(Ity_I64);
   IRTemp lo64 = newTemp(Ity_I64);
   assign( hi64, unop(Iop_V128HIto64, mkexpr(t128)) );
   assign( lo64, unop(Iop_V128to64,   mkexpr(t128)) );

   vassert(t0 && *t0 == IRTemp_INVALID);
   vassert(t1 && *t1 == IRTemp_INVALID);
   vassert(t2 && *t2 == IRTemp_INVALID);
   vassert(t3 && *t3 == IRTemp_INVALID);

   *t0 = newTemp(Ity_I32);
   *t1 = newTemp(Ity_I32);
   *t2 = newTemp(Ity_I32);
   *t3 = newTemp(Ity_I32);
   assign( *t0, unop(Iop_64to32,   mkexpr(lo64)) );
   assign( *t1, unop(Iop_64HIto32, mkexpr(lo64)) );
   assign( *t2, unop(Iop_64to32,   mkexpr(hi64)) );
   assign( *t3, unop(Iop_64HIto32, mkexpr(hi64)) );
}

/* Construct a V128-bit value from four 32-bit ints. */

static IRExpr* mkV128from32s ( IRTemp t3, IRTemp t2,
                               IRTemp t1, IRTemp t0 )
{
   return
      binop( Iop_64HLtoV128,
             binop(Iop_32HLto64, mkexpr(t3), mkexpr(t2)),
             binop(Iop_32HLto64, mkexpr(t1), mkexpr(t0))
   );
}

/* Break a 64-bit value up into four 16-bit ints. */

static void breakup64to16s ( IRTemp t64,
                             /*OUTs*/
                             IRTemp* t3, IRTemp* t2,
                             IRTemp* t1, IRTemp* t0 )
{
   IRTemp hi32 = newTemp(Ity_I32);
   IRTemp lo32 = newTemp(Ity_I32);
   assign( hi32, unop(Iop_64HIto32, mkexpr(t64)) );
   assign( lo32, unop(Iop_64to32,   mkexpr(t64)) );

   vassert(t0 && *t0 == IRTemp_INVALID);
   vassert(t1 && *t1 == IRTemp_INVALID);
   vassert(t2 && *t2 == IRTemp_INVALID);
   vassert(t3 && *t3 == IRTemp_INVALID);

   *t0 = newTemp(Ity_I16);
   *t1 = newTemp(Ity_I16);
   *t2 = newTemp(Ity_I16);
   *t3 = newTemp(Ity_I16);
   assign( *t0, unop(Iop_32to16,   mkexpr(lo32)) );
   assign( *t1, unop(Iop_32HIto16, mkexpr(lo32)) );
   assign( *t2, unop(Iop_32to16,   mkexpr(hi32)) );
   assign( *t3, unop(Iop_32HIto16, mkexpr(hi32)) );
}

/* Construct a 64-bit value from four 16-bit ints. */

static IRExpr* mk64from16s ( IRTemp t3, IRTemp t2,
                             IRTemp t1, IRTemp t0 )
{
   return
      binop( Iop_32HLto64,
             binop(Iop_16HLto32, mkexpr(t3), mkexpr(t2)),
             binop(Iop_16HLto32, mkexpr(t1), mkexpr(t0))
   );
}

/* Break a V256-bit value up into four 64-bit ints. */

static void breakupV256to64s ( IRTemp t256,
                               /*OUTs*/
                               IRTemp* t3, IRTemp* t2,
                               IRTemp* t1, IRTemp* t0 )
{
   vassert(t0 && *t0 == IRTemp_INVALID);
   vassert(t1 && *t1 == IRTemp_INVALID);
   vassert(t2 && *t2 == IRTemp_INVALID);
   vassert(t3 && *t3 == IRTemp_INVALID);
   *t0 = newTemp(Ity_I64);
   *t1 = newTemp(Ity_I64);
   *t2 = newTemp(Ity_I64);
   *t3 = newTemp(Ity_I64);
   assign( *t0, unop(Iop_V256to64_0, mkexpr(t256)) );
   assign( *t1, unop(Iop_V256to64_1, mkexpr(t256)) );
   assign( *t2, unop(Iop_V256to64_2, mkexpr(t256)) );
   assign( *t3, unop(Iop_V256to64_3, mkexpr(t256)) );
}

/* Break a V256-bit value up into two V128s. */

static void breakupV256toV128s ( IRTemp t256,
                                 /*OUTs*/
                                 IRTemp* t1, IRTemp* t0 )
{
   vassert(t0 && *t0 == IRTemp_INVALID);
   vassert(t1 && *t1 == IRTemp_INVALID);
   *t0 = newTemp(Ity_V128);
   *t1 = newTemp(Ity_V128);
   assign(*t1, unop(Iop_V256toV128_1, mkexpr(t256)));
   assign(*t0, unop(Iop_V256toV128_0, mkexpr(t256)));
}

/* Break a V256-bit value up into eight 32-bit ints.  */

static void breakupV256to32s ( IRTemp t256,
                               /*OUTs*/
                               IRTemp* t7, IRTemp* t6,
                               IRTemp* t5, IRTemp* t4,
                               IRTemp* t3, IRTemp* t2,
                               IRTemp* t1, IRTemp* t0 )
{
   IRTemp t128_1 = IRTemp_INVALID;
   IRTemp t128_0 = IRTemp_INVALID;
   breakupV256toV128s( t256, &t128_1, &t128_0 );
   breakupV128to32s( t128_1, t7, t6, t5, t4 );
   breakupV128to32s( t128_0, t3, t2, t1, t0 );
}

/* Break a V128-bit value up into two 64-bit ints. */

static void breakupV128to64s ( IRTemp t128,
                               /*OUTs*/
                               IRTemp* t1, IRTemp* t0 )
{
   vassert(t0 && *t0 == IRTemp_INVALID);
   vassert(t1 && *t1 == IRTemp_INVALID);
   *t0 = newTemp(Ity_I64);
   *t1 = newTemp(Ity_I64);
   assign( *t0, unop(Iop_V128to64,   mkexpr(t128)) );
   assign( *t1, unop(Iop_V128HIto64, mkexpr(t128)) );
}

/* Construct a V256-bit value from eight 32-bit ints. */

static IRExpr* mkV256from32s ( IRTemp t7, IRTemp t6,
                               IRTemp t5, IRTemp t4,
                               IRTemp t3, IRTemp t2,
                               IRTemp t1, IRTemp t0 )
{
   return
      binop( Iop_V128HLtoV256,
             binop( Iop_64HLtoV128,
                    binop(Iop_32HLto64, mkexpr(t7), mkexpr(t6)),
                    binop(Iop_32HLto64, mkexpr(t5), mkexpr(t4)) ),
             binop( Iop_64HLtoV128,
                    binop(Iop_32HLto64, mkexpr(t3), mkexpr(t2)),
                    binop(Iop_32HLto64, mkexpr(t1), mkexpr(t0)) )
   );
}

/* Construct a V256-bit value from four 64-bit ints. */

static IRExpr* mkV256from64s ( IRTemp t3, IRTemp t2,
                               IRTemp t1, IRTemp t0 )
{
   return
      binop( Iop_V128HLtoV256,
             binop(Iop_64HLtoV128, mkexpr(t3), mkexpr(t2)),
             binop(Iop_64HLtoV128, mkexpr(t1), mkexpr(t0))
   );
}

/* Helper for the SSSE3 (not SSE3) PMULHRSW insns.  Given two 64-bit
   values (aa,bb), computes, for each of the 4 16-bit lanes:

   (((aa_lane *s32 bb_lane) >>u 14) + 1) >>u 1
*/
static IRExpr* dis_PMULHRSW_helper ( IRExpr* aax, IRExpr* bbx )
{
   IRTemp aa      = newTemp(Ity_I64);
   IRTemp bb      = newTemp(Ity_I64);
   IRTemp aahi32s = newTemp(Ity_I64);
   IRTemp aalo32s = newTemp(Ity_I64);
   IRTemp bbhi32s = newTemp(Ity_I64);
   IRTemp bblo32s = newTemp(Ity_I64);
   IRTemp rHi     = newTemp(Ity_I64);
   IRTemp rLo     = newTemp(Ity_I64);
   IRTemp one32x2 = newTemp(Ity_I64);
   assign(aa, aax);
   assign(bb, bbx);
   assign( aahi32s,
           binop(Iop_SarN32x2,
                 binop(Iop_InterleaveHI16x4, mkexpr(aa), mkexpr(aa)),
                 mkU8(16) ));
   assign( aalo32s,
           binop(Iop_SarN32x2,
                 binop(Iop_InterleaveLO16x4, mkexpr(aa), mkexpr(aa)),
                 mkU8(16) ));
   assign( bbhi32s,
           binop(Iop_SarN32x2,
                 binop(Iop_InterleaveHI16x4, mkexpr(bb), mkexpr(bb)),
                 mkU8(16) ));
   assign( bblo32s,
           binop(Iop_SarN32x2,
                 binop(Iop_InterleaveLO16x4, mkexpr(bb), mkexpr(bb)),
                 mkU8(16) ));
   assign(one32x2, mkU64( (1ULL << 32) + 1 ));
   assign(
      rHi,
      binop(
         Iop_ShrN32x2,
         binop(
            Iop_Add32x2,
            binop(
               Iop_ShrN32x2,
               binop(Iop_Mul32x2, mkexpr(aahi32s), mkexpr(bbhi32s)),
               mkU8(14)
            ),
            mkexpr(one32x2)
         ),
         mkU8(1)
      )
   );
   assign(
      rLo,
      binop(
         Iop_ShrN32x2,
         binop(
            Iop_Add32x2,
            binop(
               Iop_ShrN32x2,
               binop(Iop_Mul32x2, mkexpr(aalo32s), mkexpr(bblo32s)),
               mkU8(14)
            ),
            mkexpr(one32x2)
         ),
         mkU8(1)
      )
   );
   return
      binop(Iop_CatEvenLanes16x4, mkexpr(rHi), mkexpr(rLo));
}

/* Helper for the SSSE3 (not SSE3) PSIGN{B,W,D} insns.  Given two 64-bit
   values (aa,bb), computes, for each lane:

          if aa_lane < 0 then - bb_lane
     else if aa_lane > 0 then bb_lane
     else 0
*/
static IRExpr* dis_PSIGN_helper ( IRExpr* aax, IRExpr* bbx, Int laneszB )
{
   IRTemp aa       = newTemp(Ity_I64);
   IRTemp bb       = newTemp(Ity_I64);
   IRTemp zero     = newTemp(Ity_I64);
   IRTemp bbNeg    = newTemp(Ity_I64);
   IRTemp negMask  = newTemp(Ity_I64);
   IRTemp posMask  = newTemp(Ity_I64);
   IROp   opSub    = Iop_INVALID;
   IROp   opCmpGTS = Iop_INVALID;

   switch (laneszB) {
      case 1: opSub = Iop_Sub8x8;  opCmpGTS = Iop_CmpGT8Sx8;  break;
      case 2: opSub = Iop_Sub16x4; opCmpGTS = Iop_CmpGT16Sx4; break;
      case 4: opSub = Iop_Sub32x2; opCmpGTS = Iop_CmpGT32Sx2; break;
      default: vassert(0);
   }

   assign( aa,      aax );
   assign( bb,      bbx );
   assign( zero,    mkU64(0) );
   assign( bbNeg,   binop(opSub,    mkexpr(zero), mkexpr(bb)) );
   assign( negMask, binop(opCmpGTS, mkexpr(zero), mkexpr(aa)) );
   assign( posMask, binop(opCmpGTS, mkexpr(aa),   mkexpr(zero)) );

   return
      binop(Iop_Or64,
            binop(Iop_And64, mkexpr(bb),    mkexpr(posMask)),
            binop(Iop_And64, mkexpr(bbNeg), mkexpr(negMask)) );

}


/* Helper for the SSSE3 (not SSE3) PABS{B,W,D} insns.  Given a 64-bit
   value aa, computes, for each lane

   if aa < 0 then -aa else aa

   Note that the result is interpreted as unsigned, so that the
   absolute value of the most negative signed input can be
   represented.
*/
static IRTemp math_PABS_MMX ( IRTemp aa, Int laneszB )
{
   IRTemp res     = newTemp(Ity_I64);
   IRTemp zero    = newTemp(Ity_I64);
   IRTemp aaNeg   = newTemp(Ity_I64);
   IRTemp negMask = newTemp(Ity_I64);
   IRTemp posMask = newTemp(Ity_I64);
   IROp   opSub   = Iop_INVALID;
   IROp   opSarN  = Iop_INVALID;

   switch (laneszB) {
      case 1: opSub = Iop_Sub8x8;  opSarN = Iop_SarN8x8;  break;
      case 2: opSub = Iop_Sub16x4; opSarN = Iop_SarN16x4; break;
      case 4: opSub = Iop_Sub32x2; opSarN = Iop_SarN32x2; break;
      default: vassert(0);
   }

   assign( negMask, binop(opSarN, mkexpr(aa), mkU8(8*laneszB-1)) );
   assign( posMask, unop(Iop_Not64, mkexpr(negMask)) );
   assign( zero,    mkU64(0) );
   assign( aaNeg,   binop(opSub, mkexpr(zero), mkexpr(aa)) );
   assign( res,
           binop(Iop_Or64,
                 binop(Iop_And64, mkexpr(aa),    mkexpr(posMask)),
                 binop(Iop_And64, mkexpr(aaNeg), mkexpr(negMask)) ));
   return res;
}

/* XMM version of math_PABS_MMX. */
static IRTemp math_PABS_XMM ( IRTemp aa, Int laneszB )
{
   IRTemp res  = newTemp(Ity_V128);
   IRTemp aaHi = newTemp(Ity_I64);
   IRTemp aaLo = newTemp(Ity_I64);
   assign(aaHi, unop(Iop_V128HIto64, mkexpr(aa)));
   assign(aaLo, unop(Iop_V128to64, mkexpr(aa)));
   assign(res, binop(Iop_64HLtoV128,
                     mkexpr(math_PABS_MMX(aaHi, laneszB)),
                     mkexpr(math_PABS_MMX(aaLo, laneszB))));
   return res;
}

/* Specialisations of math_PABS_XMM, since there's no easy way to do
   partial applications in C :-( */
static IRTemp math_PABS_XMM_pap4 ( IRTemp aa ) {
   return math_PABS_XMM(aa, 4);
}

static IRTemp math_PABS_XMM_pap2 ( IRTemp aa ) {
   return math_PABS_XMM(aa, 2);
}

static IRTemp math_PABS_XMM_pap1 ( IRTemp aa ) {
   return math_PABS_XMM(aa, 1);
}

/* YMM version of math_PABS_XMM. */
static IRTemp math_PABS_YMM ( IRTemp aa, Int laneszB )
{
   IRTemp res  = newTemp(Ity_V256);
   IRTemp aaHi = IRTemp_INVALID;
   IRTemp aaLo = IRTemp_INVALID;
   breakupV256toV128s(aa, &aaHi, &aaLo);
   assign(res, binop(Iop_V128HLtoV256,
                     mkexpr(math_PABS_XMM(aaHi, laneszB)),
                     mkexpr(math_PABS_XMM(aaLo, laneszB))));
   return res;
}

static IRTemp math_PABS_YMM_pap4 ( IRTemp aa ) {
   return math_PABS_YMM(aa, 4);
}

static IRTemp math_PABS_YMM_pap2 ( IRTemp aa ) {
   return math_PABS_YMM(aa, 2);
}

static IRTemp math_PABS_YMM_pap1 ( IRTemp aa ) {
   return math_PABS_YMM(aa, 1);
}

static IRExpr* dis_PALIGNR_XMM_helper ( IRTemp hi64,
                                        IRTemp lo64, Long byteShift )
{
   vassert(byteShift >= 1 && byteShift <= 7);
   return
      binop(Iop_Or64,
            binop(Iop_Shl64, mkexpr(hi64), mkU8(8*(8-byteShift))),
            binop(Iop_Shr64, mkexpr(lo64), mkU8(8*byteShift))
      );
}

static IRTemp math_PALIGNR_XMM ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   IRTemp res = newTemp(Ity_V128);
   IRTemp sHi = newTemp(Ity_I64);
   IRTemp sLo = newTemp(Ity_I64);
   IRTemp dHi = newTemp(Ity_I64);
   IRTemp dLo = newTemp(Ity_I64);
   IRTemp rHi = newTemp(Ity_I64);
   IRTemp rLo = newTemp(Ity_I64);

   assign( dHi, unop(Iop_V128HIto64, mkexpr(dV)) );
   assign( dLo, unop(Iop_V128to64,   mkexpr(dV)) );
   assign( sHi, unop(Iop_V128HIto64, mkexpr(sV)) );
   assign( sLo, unop(Iop_V128to64,   mkexpr(sV)) );

   if (imm8 == 0) {
      assign( rHi, mkexpr(sHi) );
      assign( rLo, mkexpr(sLo) );
   }
   else if (imm8 >= 1 && imm8 <= 7) {
      assign( rHi, dis_PALIGNR_XMM_helper(dLo, sHi, imm8) );
      assign( rLo, dis_PALIGNR_XMM_helper(sHi, sLo, imm8) );
   }
   else if (imm8 == 8) {
      assign( rHi, mkexpr(dLo) );
      assign( rLo, mkexpr(sHi) );
   }
   else if (imm8 >= 9 && imm8 <= 15) {
      assign( rHi, dis_PALIGNR_XMM_helper(dHi, dLo, imm8-8) );
      assign( rLo, dis_PALIGNR_XMM_helper(dLo, sHi, imm8-8) );
   }
   else if (imm8 == 16) {
      assign( rHi, mkexpr(dHi) );
      assign( rLo, mkexpr(dLo) );
   }
   else if (imm8 >= 17 && imm8 <= 23) {
      assign( rHi, binop(Iop_Shr64, mkexpr(dHi), mkU8(8*(imm8-16))) );
      assign( rLo, dis_PALIGNR_XMM_helper(dHi, dLo, imm8-16) );
   }
   else if (imm8 == 24) {
      assign( rHi, mkU64(0) );
      assign( rLo, mkexpr(dHi) );
   }
   else if (imm8 >= 25 && imm8 <= 31) {
      assign( rHi, mkU64(0) );
      assign( rLo, binop(Iop_Shr64, mkexpr(dHi), mkU8(8*(imm8-24))) );
   }
   else if (imm8 >= 32 && imm8 <= 255) {
      assign( rHi, mkU64(0) );
      assign( rLo, mkU64(0) );
   }
   else
      vassert(0);

   assign( res, binop(Iop_64HLtoV128, mkexpr(rHi), mkexpr(rLo)));
   return res;
}


/* Generate a SIGSEGV followed by a restart of the current instruction
   if effective_addr is not 16-aligned.  This is required behaviour
   for some SSE3 instructions and all 128-bit SSSE3 instructions.
   This assumes that guest_RIP_curr_instr is set correctly! */
static
void gen_SEGV_if_not_XX_aligned ( IRTemp effective_addr, ULong mask )
{
   stmt(
      IRStmt_Exit(
         binop(Iop_CmpNE64,
               binop(Iop_And64,mkexpr(effective_addr),mkU64(mask)),
               mkU64(0)),
         Ijk_SigSEGV,
         IRConst_U64(guest_RIP_curr_instr),
         OFFB_RIP
      )
   );
}

static void gen_SEGV_if_not_16_aligned ( IRTemp effective_addr ) {
   gen_SEGV_if_not_XX_aligned(effective_addr, 16-1);
}

static void gen_SEGV_if_not_32_aligned ( IRTemp effective_addr ) {
   gen_SEGV_if_not_XX_aligned(effective_addr, 32-1);
}

static void gen_SEGV_if_not_64_aligned ( IRTemp effective_addr ) {
   gen_SEGV_if_not_XX_aligned(effective_addr, 64-1);
}

/* Helper for deciding whether a given insn (starting at the opcode
   byte) may validly be used with a LOCK prefix.  The following insns
   may be used with LOCK when their destination operand is in memory.
   AFAICS this is exactly the same for both 32-bit and 64-bit mode.

   ADD        80 /0,  81 /0,  82 /0,  83 /0,  00,  01
   OR         80 /1,  81 /1,  82 /x,  83 /1,  08,  09
   ADC        80 /2,  81 /2,  82 /2,  83 /2,  10,  11
   SBB        81 /3,  81 /3,  82 /x,  83 /3,  18,  19
   AND        80 /4,  81 /4,  82 /x,  83 /4,  20,  21
   SUB        80 /5,  81 /5,  82 /x,  83 /5,  28,  29
   XOR        80 /6,  81 /6,  82 /x,  83 /6,  30,  31

   DEC        FE /1,  FF /1
   INC        FE /0,  FF /0

   NEG        F6 /3,  F7 /3
   NOT        F6 /2,  F7 /2

   XCHG       86, 87

   BTC        0F BB,  0F BA /7
   BTR        0F B3,  0F BA /6
   BTS        0F AB,  0F BA /5

   CMPXCHG    0F B0,  0F B1
   CMPXCHG8B  0F C7 /1

   XADD       0F C0,  0F C1

   ------------------------------

   80 /0  =  addb $imm8,  rm8
   81 /0  =  addl $imm32, rm32  and  addw $imm16, rm16
   82 /0  =  addb $imm8,  rm8
   83 /0  =  addl $simm8, rm32  and  addw $simm8, rm16

   00     =  addb r8,  rm8
   01     =  addl r32, rm32  and  addw r16, rm16

   Same for ADD OR ADC SBB AND SUB XOR

   FE /1  = dec rm8
   FF /1  = dec rm32  and  dec rm16

   FE /0  = inc rm8
   FF /0  = inc rm32  and  inc rm16

   F6 /3  = neg rm8
   F7 /3  = neg rm32  and  neg rm16

   F6 /2  = not rm8
   F7 /2  = not rm32  and  not rm16

   0F BB     = btcw r16, rm16    and  btcl r32, rm32
   OF BA /7  = btcw $imm8, rm16  and  btcw $imm8, rm32

   Same for BTS, BTR
*/
static Bool can_be_used_with_LOCK_prefix ( const UChar* opc )
{
   switch (opc[0]) {
      case 0x00: case 0x01: case 0x08: case 0x09:
      case 0x10: case 0x11: case 0x18: case 0x19:
      case 0x20: case 0x21: case 0x28: case 0x29:
      case 0x30: case 0x31:
         if (!epartIsReg(opc[1]))
            return True;
         break;

      case 0x80: case 0x81: case 0x82: case 0x83:
         if (gregLO3ofRM(opc[1]) >= 0 && gregLO3ofRM(opc[1]) <= 6
             && !epartIsReg(opc[1]))
            return True;
         break;

      case 0xFE: case 0xFF:
         if (gregLO3ofRM(opc[1]) >= 0 && gregLO3ofRM(opc[1]) <= 1
             && !epartIsReg(opc[1]))
            return True;
         break;

      case 0xF6: case 0xF7:
         if (gregLO3ofRM(opc[1]) >= 2 && gregLO3ofRM(opc[1]) <= 3
             && !epartIsReg(opc[1]))
            return True;
         break;

      case 0x86: case 0x87:
         if (!epartIsReg(opc[1]))
            return True;
         break;

      case 0x0F: {
         switch (opc[1]) {
            case 0xBB: case 0xB3: case 0xAB:
               if (!epartIsReg(opc[2]))
                  return True;
               break;
            case 0xBA:
               if (gregLO3ofRM(opc[2]) >= 5 && gregLO3ofRM(opc[2]) <= 7
                   && !epartIsReg(opc[2]))
                  return True;
               break;
            case 0xB0: case 0xB1:
               if (!epartIsReg(opc[2]))
                  return True;
               break;
            case 0xC7:
               if (gregLO3ofRM(opc[2]) == 1 && !epartIsReg(opc[2]) )
                  return True;
               break;
            case 0xC0: case 0xC1:
               if (!epartIsReg(opc[2]))
                  return True;
               break;
            default:
               break;
         } /* switch (opc[1]) */
         break;
      }

      default:
         break;
   } /* switch (opc[0]) */

   return False;
}


/*------------------------------------------------------------*/
/*---                                                      ---*/
/*--- Top-level SSE/SSE2: dis_ESC_0F__SSE2                 ---*/
/*---                                                      ---*/
/*------------------------------------------------------------*/

static Long dis_COMISD ( const VexAbiInfo* vbi, Prefix pfx,
                         Long delta, Bool isAvx, UChar opc )
{
   vassert(opc == 0x2F/*COMISD*/ || opc == 0x2E/*UCOMISD*/);
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp argL  = newTemp(Ity_F64);
   IRTemp argR  = newTemp(Ity_F64);
   UChar  modrm = getUChar(delta);
   IRTemp addr  = IRTemp_INVALID;
   if (epartIsReg(modrm)) {
      assign( argR, getXMMRegLane64F( eregOfRexRM(pfx,modrm),
                                      0/*lowest lane*/ ) );
      delta += 1;
      DIP("%s%scomisd %s,%s\n", isAvx ? "v" : "",
                                opc==0x2E ? "u" : "",
                                nameXMMReg(eregOfRexRM(pfx,modrm)),
                                nameXMMReg(gregOfRexRM(pfx,modrm)) );
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argR, loadLE(Ity_F64, mkexpr(addr)) );
      delta += alen;
      DIP("%s%scomisd %s,%s\n", isAvx ? "v" : "",
                                opc==0x2E ? "u" : "",
                                dis_buf,
                                nameXMMReg(gregOfRexRM(pfx,modrm)) );
   }
   assign( argL, getXMMRegLane64F( gregOfRexRM(pfx,modrm),
                                   0/*lowest lane*/ ) );

   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
   stmt( IRStmt_Put(
            OFFB_CC_DEP1,
            binop( Iop_And64,
                   unop( Iop_32Uto64,
                         binop(Iop_CmpF64, mkexpr(argL), mkexpr(argR)) ),
                   mkU64(0x45)
       )));
   return delta;
}


static Long dis_COMISS ( const VexAbiInfo* vbi, Prefix pfx,
                         Long delta, Bool isAvx, UChar opc )
{
   vassert(opc == 0x2F/*COMISS*/ || opc == 0x2E/*UCOMISS*/);
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp argL  = newTemp(Ity_F32);
   IRTemp argR  = newTemp(Ity_F32);
   UChar  modrm = getUChar(delta);
   IRTemp addr  = IRTemp_INVALID;
   if (epartIsReg(modrm)) {
      assign( argR, getXMMRegLane32F( eregOfRexRM(pfx,modrm),
                                      0/*lowest lane*/ ) );
      delta += 1;
      DIP("%s%scomiss %s,%s\n", isAvx ? "v" : "",
                                opc==0x2E ? "u" : "",
                                nameXMMReg(eregOfRexRM(pfx,modrm)),
                                nameXMMReg(gregOfRexRM(pfx,modrm)) );
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argR, loadLE(Ity_F32, mkexpr(addr)) );
      delta += alen;
      DIP("%s%scomiss %s,%s\n", isAvx ? "v" : "",
                                opc==0x2E ? "u" : "",
                                dis_buf,
                                nameXMMReg(gregOfRexRM(pfx,modrm)) );
   }
   assign( argL, getXMMRegLane32F( gregOfRexRM(pfx,modrm),
                                   0/*lowest lane*/ ) );

   stmt( IRStmt_Put( OFFB_CC_OP,   mkU64(AMD64G_CC_OP_COPY) ));
   stmt( IRStmt_Put( OFFB_CC_DEP2, mkU64(0) ));
   stmt( IRStmt_Put(
            OFFB_CC_DEP1,
            binop( Iop_And64,
                   unop( Iop_32Uto64,
                         binop(Iop_CmpF64,
                               unop(Iop_F32toF64,mkexpr(argL)),
                               unop(Iop_F32toF64,mkexpr(argR)))),
                   mkU64(0x45)
       )));
   return delta;
}


static Long dis_PSHUFD_32x4 ( const VexAbiInfo* vbi, Prefix pfx,
                              Long delta, Bool writesYmm )
{
   Int    order;
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp sV    = newTemp(Ity_V128);
   UChar  modrm = getUChar(delta);
   const HChar* strV  = writesYmm ? "v" : "";
   IRTemp addr  = IRTemp_INVALID;
   if (epartIsReg(modrm)) {
      assign( sV, getXMMReg(eregOfRexRM(pfx,modrm)) );
      order = (Int)getUChar(delta+1);
      delta += 1+1;
      DIP("%spshufd $%d,%s,%s\n", strV, order,
                                  nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf,
                        1/*byte after the amode*/ );
      assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
      order = (Int)getUChar(delta+alen);
      delta += alen+1;
      DIP("%spshufd $%d,%s,%s\n", strV, order,
                                 dis_buf,
                                 nameXMMReg(gregOfRexRM(pfx,modrm)));
   }

   IRTemp s3, s2, s1, s0;
   s3 = s2 = s1 = s0 = IRTemp_INVALID;
   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );

#  define SEL(n)  ((n)==0 ? s0 : ((n)==1 ? s1 : ((n)==2 ? s2 : s3)))
   IRTemp dV = newTemp(Ity_V128);
   assign(dV,
          mkV128from32s( SEL((order>>6)&3), SEL((order>>4)&3),
                         SEL((order>>2)&3), SEL((order>>0)&3) )
   );
#  undef SEL

   (writesYmm ? putYMMRegLoAndZU : putXMMReg)
      (gregOfRexRM(pfx,modrm), mkexpr(dV));
   return delta;
}


static Long dis_PSHUFD_32x8 ( const VexAbiInfo* vbi, Prefix pfx, Long delta )
{
   Int    order;
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp sV    = newTemp(Ity_V256);
   UChar  modrm = getUChar(delta);
   IRTemp addr  = IRTemp_INVALID;
   UInt   rG    = gregOfRexRM(pfx,modrm);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( sV, getYMMReg(rE) );
      order = (Int)getUChar(delta+1);
      delta += 1+1;
      DIP("vpshufd $%d,%s,%s\n", order, nameYMMReg(rE), nameYMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf,
                        1/*byte after the amode*/ );
      assign( sV, loadLE(Ity_V256, mkexpr(addr)) );
      order = (Int)getUChar(delta+alen);
      delta += alen+1;
      DIP("vpshufd $%d,%s,%s\n", order,  dis_buf, nameYMMReg(rG));
   }

   IRTemp s[8];
   s[7] = s[6] = s[5] = s[4] = s[3] = s[2] = s[1] = s[0] = IRTemp_INVALID;
   breakupV256to32s( sV, &s[7], &s[6], &s[5], &s[4],
                         &s[3], &s[2], &s[1], &s[0] );

   putYMMReg( rG, mkV256from32s( s[4 + ((order>>6)&3)],
                                 s[4 + ((order>>4)&3)],
                                 s[4 + ((order>>2)&3)],
                                 s[4 + ((order>>0)&3)],
                                 s[0 + ((order>>6)&3)],
                                 s[0 + ((order>>4)&3)],
                                 s[0 + ((order>>2)&3)],
                                 s[0 + ((order>>0)&3)] ) );
   return delta;
}


static IRTemp math_PSRLDQ ( IRTemp sV, Int imm )
{
   IRTemp dV    = newTemp(Ity_V128);
   IRTemp hi64  = newTemp(Ity_I64);
   IRTemp lo64  = newTemp(Ity_I64);
   IRTemp hi64r = newTemp(Ity_I64);
   IRTemp lo64r = newTemp(Ity_I64);

   vassert(imm >= 0 && imm <= 255);
   if (imm >= 16) {
      assign(dV, mkV128(0x0000));
      return dV;
   }

   assign( hi64, unop(Iop_V128HIto64, mkexpr(sV)) );
   assign( lo64, unop(Iop_V128to64, mkexpr(sV)) );

   if (imm == 0) {
      assign( lo64r, mkexpr(lo64) );
      assign( hi64r, mkexpr(hi64) );
   }
   else
   if (imm == 8) {
      assign( hi64r, mkU64(0) );
      assign( lo64r, mkexpr(hi64) );
   }
   else
   if (imm > 8) {
      assign( hi64r, mkU64(0) );
      assign( lo64r, binop( Iop_Shr64, mkexpr(hi64), mkU8( 8*(imm-8) ) ));
   } else {
      assign( hi64r, binop( Iop_Shr64, mkexpr(hi64), mkU8(8 * imm) ));
      assign( lo64r,
              binop( Iop_Or64,
                     binop(Iop_Shr64, mkexpr(lo64),
                           mkU8(8 * imm)),
                     binop(Iop_Shl64, mkexpr(hi64),
                           mkU8(8 * (8 - imm)) )
                     )
              );
   }

   assign( dV, binop(Iop_64HLtoV128, mkexpr(hi64r), mkexpr(lo64r)) );
   return dV;
}


static IRTemp math_PSLLDQ ( IRTemp sV, Int imm )
{
   IRTemp       dV    = newTemp(Ity_V128);
   IRTemp       hi64  = newTemp(Ity_I64);
   IRTemp       lo64  = newTemp(Ity_I64);
   IRTemp       hi64r = newTemp(Ity_I64);
   IRTemp       lo64r = newTemp(Ity_I64);

   vassert(imm >= 0 && imm <= 255);
   if (imm >= 16) {
      assign(dV, mkV128(0x0000));
      return dV;
   }

   assign( hi64, unop(Iop_V128HIto64, mkexpr(sV)) );
   assign( lo64, unop(Iop_V128to64, mkexpr(sV)) );

   if (imm == 0) {
      assign( lo64r, mkexpr(lo64) );
      assign( hi64r, mkexpr(hi64) );
   }
   else
   if (imm == 8) {
      assign( lo64r, mkU64(0) );
      assign( hi64r, mkexpr(lo64) );
   }
   else
   if (imm > 8) {
      assign( lo64r, mkU64(0) );
      assign( hi64r, binop( Iop_Shl64, mkexpr(lo64), mkU8( 8*(imm-8) ) ));
   } else {
      assign( lo64r, binop( Iop_Shl64, mkexpr(lo64), mkU8(8 * imm) ));
      assign( hi64r,
              binop( Iop_Or64,
                     binop(Iop_Shl64, mkexpr(hi64),
                           mkU8(8 * imm)),
                     binop(Iop_Shr64, mkexpr(lo64),
                           mkU8(8 * (8 - imm)) )
                     )
              );
   }

   assign( dV, binop(Iop_64HLtoV128, mkexpr(hi64r), mkexpr(lo64r)) );
   return dV;
}


static Long dis_CVTxSD2SI ( const VexAbiInfo* vbi, Prefix pfx,
                            Long delta, Bool isAvx, UChar opc, Int sz )
{
   vassert(opc == 0x2D/*CVTSD2SI*/ || opc == 0x2C/*CVTTSD2SI*/);
   HChar  dis_buf[50];
   Int    alen   = 0;
   UChar  modrm  = getUChar(delta);
   IRTemp addr   = IRTemp_INVALID;
   IRTemp rmode  = newTemp(Ity_I32);
   IRTemp f64lo  = newTemp(Ity_F64);
   Bool   r2zero = toBool(opc == 0x2C);

   if (epartIsReg(modrm)) {
      delta += 1;
      assign(f64lo, getXMMRegLane64F(eregOfRexRM(pfx,modrm), 0));
      DIP("%scvt%ssd2si %s,%s\n", isAvx ? "v" : "", r2zero ? "t" : "",
                                  nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameIReg(sz, gregOfRexRM(pfx,modrm),
                                           False));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign(f64lo, loadLE(Ity_F64, mkexpr(addr)));
      delta += alen;
      DIP("%scvt%ssd2si %s,%s\n", isAvx ? "v" : "", r2zero ? "t" : "",
                                  dis_buf,
                                  nameIReg(sz, gregOfRexRM(pfx,modrm),
                                           False));
   }

   if (r2zero) {
      assign( rmode, mkU32((UInt)Irrm_ZERO) );
   } else {
      assign( rmode, get_sse_roundingmode() );
   }

   if (sz == 4) {
      putIReg32( gregOfRexRM(pfx,modrm),
                 binop( Iop_F64toI32S, mkexpr(rmode), mkexpr(f64lo)) );
   } else {
      vassert(sz == 8);
      putIReg64( gregOfRexRM(pfx,modrm),
                 binop( Iop_F64toI64S, mkexpr(rmode), mkexpr(f64lo)) );
   }

   return delta;
}


static Long dis_CVTxSS2SI ( const VexAbiInfo* vbi, Prefix pfx,
                            Long delta, Bool isAvx, UChar opc, Int sz )
{
   vassert(opc == 0x2D/*CVTSS2SI*/ || opc == 0x2C/*CVTTSS2SI*/);
   HChar  dis_buf[50];
   Int    alen   = 0;
   UChar  modrm  = getUChar(delta);
   IRTemp addr   = IRTemp_INVALID;
   IRTemp rmode  = newTemp(Ity_I32);
   IRTemp f32lo  = newTemp(Ity_F32);
   Bool   r2zero = toBool(opc == 0x2C);

   if (epartIsReg(modrm)) {
      delta += 1;
      assign(f32lo, getXMMRegLane32F(eregOfRexRM(pfx,modrm), 0));
      DIP("%scvt%sss2si %s,%s\n", isAvx ? "v" : "", r2zero ? "t" : "",
                                  nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameIReg(sz, gregOfRexRM(pfx,modrm),
                                           False));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign(f32lo, loadLE(Ity_F32, mkexpr(addr)));
      delta += alen;
      DIP("%scvt%sss2si %s,%s\n", isAvx ? "v" : "", r2zero ? "t" : "",
                                  dis_buf,
                                  nameIReg(sz, gregOfRexRM(pfx,modrm),
                                           False));
   }

   if (r2zero) {
      assign( rmode, mkU32((UInt)Irrm_ZERO) );
   } else {
      assign( rmode, get_sse_roundingmode() );
   }

   if (sz == 4) {
      putIReg32( gregOfRexRM(pfx,modrm),
                 binop( Iop_F64toI32S,
                        mkexpr(rmode),
                        unop(Iop_F32toF64, mkexpr(f32lo))) );
   } else {
      vassert(sz == 8);
      putIReg64( gregOfRexRM(pfx,modrm),
                 binop( Iop_F64toI64S,
                        mkexpr(rmode),
                        unop(Iop_F32toF64, mkexpr(f32lo))) );
   }

   return delta;
}


static Long dis_CVTPS2PD_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp f32lo = newTemp(Ity_F32);
   IRTemp f32hi = newTemp(Ity_F32);
   UChar  modrm = getUChar(delta);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( f32lo, getXMMRegLane32F(rE, 0) );
      assign( f32hi, getXMMRegLane32F(rE, 1) );
      delta += 1;
      DIP("%scvtps2pd %s,%s\n",
          isAvx ? "v" : "", nameXMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( f32lo, loadLE(Ity_F32, mkexpr(addr)) );
      assign( f32hi, loadLE(Ity_F32,
                            binop(Iop_Add64,mkexpr(addr),mkU64(4))) );
      delta += alen;
      DIP("%scvtps2pd %s,%s\n",
          isAvx ? "v" : "", dis_buf, nameXMMReg(rG));
   }

   putXMMRegLane64F( rG, 1, unop(Iop_F32toF64, mkexpr(f32hi)) );
   putXMMRegLane64F( rG, 0, unop(Iop_F32toF64, mkexpr(f32lo)) );
   if (isAvx)
      putYMMRegLane128( rG, 1, mkV128(0));
   return delta;
}


static Long dis_CVTPS2PD_256 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp f32_0 = newTemp(Ity_F32);
   IRTemp f32_1 = newTemp(Ity_F32);
   IRTemp f32_2 = newTemp(Ity_F32);
   IRTemp f32_3 = newTemp(Ity_F32);
   UChar  modrm = getUChar(delta);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( f32_0, getXMMRegLane32F(rE, 0) );
      assign( f32_1, getXMMRegLane32F(rE, 1) );
      assign( f32_2, getXMMRegLane32F(rE, 2) );
      assign( f32_3, getXMMRegLane32F(rE, 3) );
      delta += 1;
      DIP("vcvtps2pd %s,%s\n", nameXMMReg(rE), nameYMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( f32_0, loadLE(Ity_F32, mkexpr(addr)) );
      assign( f32_1, loadLE(Ity_F32,
                            binop(Iop_Add64,mkexpr(addr),mkU64(4))) );
      assign( f32_2, loadLE(Ity_F32,
                            binop(Iop_Add64,mkexpr(addr),mkU64(8))) );
      assign( f32_3, loadLE(Ity_F32,
                            binop(Iop_Add64,mkexpr(addr),mkU64(12))) );
      delta += alen;
      DIP("vcvtps2pd %s,%s\n", dis_buf, nameYMMReg(rG));
   }

   putYMMRegLane64F( rG, 3, unop(Iop_F32toF64, mkexpr(f32_3)) );
   putYMMRegLane64F( rG, 2, unop(Iop_F32toF64, mkexpr(f32_2)) );
   putYMMRegLane64F( rG, 1, unop(Iop_F32toF64, mkexpr(f32_1)) );
   putYMMRegLane64F( rG, 0, unop(Iop_F32toF64, mkexpr(f32_0)) );
   return delta;
}


static Long dis_CVTPD2PS_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp argV  = newTemp(Ity_V128);
   IRTemp rmode = newTemp(Ity_I32);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( argV, getXMMReg(rE) );
      delta += 1;
      DIP("%scvtpd2ps %s,%s\n", isAvx ? "v" : "",
          nameXMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argV, loadLE(Ity_V128, mkexpr(addr)) );
      delta += alen;
      DIP("%scvtpd2ps %s,%s\n", isAvx ? "v" : "",
          dis_buf, nameXMMReg(rG) );
   }

   assign( rmode, get_sse_roundingmode() );
   IRTemp t0 = newTemp(Ity_F64);
   IRTemp t1 = newTemp(Ity_F64);
   assign( t0, unop(Iop_ReinterpI64asF64,
                    unop(Iop_V128to64, mkexpr(argV))) );
   assign( t1, unop(Iop_ReinterpI64asF64,
                    unop(Iop_V128HIto64, mkexpr(argV))) );

#  define CVT(_t)  binop( Iop_F64toF32, mkexpr(rmode), mkexpr(_t) )
   putXMMRegLane32(  rG, 3, mkU32(0) );
   putXMMRegLane32(  rG, 2, mkU32(0) );
   putXMMRegLane32F( rG, 1, CVT(t1) );
   putXMMRegLane32F( rG, 0, CVT(t0) );
#  undef CVT
   if (isAvx)
      putYMMRegLane128( rG, 1, mkV128(0) );

   return delta;
}


static Long dis_CVTxPS2DQ_128 ( const VexAbiInfo* vbi, Prefix pfx,
                                Long delta, Bool isAvx, Bool r2zero )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   IRTemp argV  = newTemp(Ity_V128);
   IRTemp rmode = newTemp(Ity_I32);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp t0, t1, t2, t3;

   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( argV, getXMMReg(rE) );
      delta += 1;
      DIP("%scvt%sps2dq %s,%s\n",
          isAvx ? "v" : "", r2zero ? "t" : "", nameXMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argV, loadLE(Ity_V128, mkexpr(addr)) );
      delta += alen;
      DIP("%scvt%sps2dq %s,%s\n",
          isAvx ? "v" : "", r2zero ? "t" : "", dis_buf, nameXMMReg(rG) );
   }

   assign( rmode, r2zero ? mkU32((UInt)Irrm_ZERO)
                         : get_sse_roundingmode() );
   t0 = t1 = t2 = t3 = IRTemp_INVALID;
   breakupV128to32s( argV, &t3, &t2, &t1, &t0 );
   /* This is less than ideal.  If it turns out to be a performance
      bottleneck it can be improved. */
#  define CVT(_t)                             \
      binop( Iop_F64toI32S,                   \
             mkexpr(rmode),                   \
             unop( Iop_F32toF64,              \
                   unop( Iop_ReinterpI32asF32, mkexpr(_t))) )

   putXMMRegLane32( rG, 3, CVT(t3) );
   putXMMRegLane32( rG, 2, CVT(t2) );
   putXMMRegLane32( rG, 1, CVT(t1) );
   putXMMRegLane32( rG, 0, CVT(t0) );
#  undef CVT
   if (isAvx)
      putYMMRegLane128( rG, 1, mkV128(0) );

   return delta;
}


static Long dis_CVTxPS2DQ_256 ( const VexAbiInfo* vbi, Prefix pfx,
                                Long delta, Bool r2zero )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   IRTemp argV  = newTemp(Ity_V256);
   IRTemp rmode = newTemp(Ity_I32);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp t0, t1, t2, t3, t4, t5, t6, t7;

   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( argV, getYMMReg(rE) );
      delta += 1;
      DIP("vcvt%sps2dq %s,%s\n",
          r2zero ? "t" : "", nameYMMReg(rE), nameYMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argV, loadLE(Ity_V256, mkexpr(addr)) );
      delta += alen;
      DIP("vcvt%sps2dq %s,%s\n",
          r2zero ? "t" : "", dis_buf, nameYMMReg(rG) );
   }

   assign( rmode, r2zero ? mkU32((UInt)Irrm_ZERO)
                         : get_sse_roundingmode() );
   t0 = t1 = t2 = t3 = t4 = t5 = t6 = t7 = IRTemp_INVALID;
   breakupV256to32s( argV, &t7, &t6, &t5, &t4, &t3, &t2, &t1, &t0 );
   /* This is less than ideal.  If it turns out to be a performance
      bottleneck it can be improved. */
#  define CVT(_t)                             \
      binop( Iop_F64toI32S,                   \
             mkexpr(rmode),                   \
             unop( Iop_F32toF64,              \
                   unop( Iop_ReinterpI32asF32, mkexpr(_t))) )

   putYMMRegLane32( rG, 7, CVT(t7) );
   putYMMRegLane32( rG, 6, CVT(t6) );
   putYMMRegLane32( rG, 5, CVT(t5) );
   putYMMRegLane32( rG, 4, CVT(t4) );
   putYMMRegLane32( rG, 3, CVT(t3) );
   putYMMRegLane32( rG, 2, CVT(t2) );
   putYMMRegLane32( rG, 1, CVT(t1) );
   putYMMRegLane32( rG, 0, CVT(t0) );
#  undef CVT

   return delta;
}


static Long dis_CVTxPD2DQ_128 ( const VexAbiInfo* vbi, Prefix pfx,
                                Long delta, Bool isAvx, Bool r2zero )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   IRTemp argV  = newTemp(Ity_V128);
   IRTemp rmode = newTemp(Ity_I32);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp t0, t1;

   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( argV, getXMMReg(rE) );
      delta += 1;
      DIP("%scvt%spd2dq %s,%s\n",
          isAvx ? "v" : "", r2zero ? "t" : "", nameXMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argV, loadLE(Ity_V128, mkexpr(addr)) );
      delta += alen;
      DIP("%scvt%spd2dqx %s,%s\n",
          isAvx ? "v" : "", r2zero ? "t" : "", dis_buf, nameXMMReg(rG) );
   }

   if (r2zero) {
      assign(rmode, mkU32((UInt)Irrm_ZERO) );
   } else {
      assign( rmode, get_sse_roundingmode() );
   }

   t0 = newTemp(Ity_F64);
   t1 = newTemp(Ity_F64);
   assign( t0, unop(Iop_ReinterpI64asF64,
                    unop(Iop_V128to64, mkexpr(argV))) );
   assign( t1, unop(Iop_ReinterpI64asF64,
                    unop(Iop_V128HIto64, mkexpr(argV))) );

#  define CVT(_t)  binop( Iop_F64toI32S,                   \
                          mkexpr(rmode),                   \
                          mkexpr(_t) )

   putXMMRegLane32( rG, 3, mkU32(0) );
   putXMMRegLane32( rG, 2, mkU32(0) );
   putXMMRegLane32( rG, 1, CVT(t1) );
   putXMMRegLane32( rG, 0, CVT(t0) );
#  undef CVT
   if (isAvx)
      putYMMRegLane128( rG, 1, mkV128(0) );

   return delta;
}


static Long dis_CVTxPD2DQ_256 ( const VexAbiInfo* vbi, Prefix pfx,
                                Long delta, Bool r2zero )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   IRTemp argV  = newTemp(Ity_V256);
   IRTemp rmode = newTemp(Ity_I32);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp t0, t1, t2, t3;

   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( argV, getYMMReg(rE) );
      delta += 1;
      DIP("vcvt%spd2dq %s,%s\n",
          r2zero ? "t" : "", nameYMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argV, loadLE(Ity_V256, mkexpr(addr)) );
      delta += alen;
      DIP("vcvt%spd2dqy %s,%s\n",
          r2zero ? "t" : "", dis_buf, nameXMMReg(rG) );
   }

   if (r2zero) {
      assign(rmode, mkU32((UInt)Irrm_ZERO) );
   } else {
      assign( rmode, get_sse_roundingmode() );
   }

   t0 = IRTemp_INVALID;
   t1 = IRTemp_INVALID;
   t2 = IRTemp_INVALID;
   t3 = IRTemp_INVALID;
   breakupV256to64s( argV, &t3, &t2, &t1, &t0 );

#  define CVT(_t)  binop( Iop_F64toI32S,                   \
                          mkexpr(rmode),                   \
                          unop( Iop_ReinterpI64asF64,      \
                                mkexpr(_t) ) )

   putXMMRegLane32( rG, 3, CVT(t3) );
   putXMMRegLane32( rG, 2, CVT(t2) );
   putXMMRegLane32( rG, 1, CVT(t1) );
   putXMMRegLane32( rG, 0, CVT(t0) );
#  undef CVT
   putYMMRegLane128( rG, 1, mkV128(0) );

   return delta;
}


static Long dis_CVTDQ2PS_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   IRTemp argV  = newTemp(Ity_V128);
   IRTemp rmode = newTemp(Ity_I32);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp t0, t1, t2, t3;

   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( argV, getXMMReg(rE) );
      delta += 1;
      DIP("%scvtdq2ps %s,%s\n",
          isAvx ? "v" : "", nameXMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argV, loadLE(Ity_V128, mkexpr(addr)) );
      delta += alen;
      DIP("%scvtdq2ps %s,%s\n",
          isAvx ? "v" : "", dis_buf, nameXMMReg(rG) );
   }

   assign( rmode, get_sse_roundingmode() );
   t0 = IRTemp_INVALID;
   t1 = IRTemp_INVALID;
   t2 = IRTemp_INVALID;
   t3 = IRTemp_INVALID;
   breakupV128to32s( argV, &t3, &t2, &t1, &t0 );

#  define CVT(_t)  binop( Iop_F64toF32,                    \
                          mkexpr(rmode),                   \
                          unop(Iop_I32StoF64,mkexpr(_t)))

   putXMMRegLane32F( rG, 3, CVT(t3) );
   putXMMRegLane32F( rG, 2, CVT(t2) );
   putXMMRegLane32F( rG, 1, CVT(t1) );
   putXMMRegLane32F( rG, 0, CVT(t0) );
#  undef CVT
   if (isAvx)
      putYMMRegLane128( rG, 1, mkV128(0) );

   return delta;
}

static Long dis_CVTDQ2PS_256 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta )
{
   IRTemp addr   = IRTemp_INVALID;
   Int    alen   = 0;
   HChar  dis_buf[50];
   UChar  modrm  = getUChar(delta);
   IRTemp argV   = newTemp(Ity_V256);
   IRTemp rmode  = newTemp(Ity_I32);
   UInt   rG     = gregOfRexRM(pfx,modrm);
   IRTemp t0, t1, t2, t3, t4, t5, t6, t7;

   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( argV, getYMMReg(rE) );
      delta += 1;
      DIP("vcvtdq2ps %s,%s\n", nameYMMReg(rE), nameYMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( argV, loadLE(Ity_V256, mkexpr(addr)) );
      delta += alen;
      DIP("vcvtdq2ps %s,%s\n", dis_buf, nameYMMReg(rG) );
   }

   assign( rmode, get_sse_roundingmode() );
   t0 = IRTemp_INVALID;
   t1 = IRTemp_INVALID;
   t2 = IRTemp_INVALID;
   t3 = IRTemp_INVALID;
   t4 = IRTemp_INVALID;
   t5 = IRTemp_INVALID;
   t6 = IRTemp_INVALID;
   t7 = IRTemp_INVALID;
   breakupV256to32s( argV, &t7, &t6, &t5, &t4, &t3, &t2, &t1, &t0 );

#  define CVT(_t)  binop( Iop_F64toF32,                    \
                          mkexpr(rmode),                   \
                          unop(Iop_I32StoF64,mkexpr(_t)))

   putYMMRegLane32F( rG, 7, CVT(t7) );
   putYMMRegLane32F( rG, 6, CVT(t6) );
   putYMMRegLane32F( rG, 5, CVT(t5) );
   putYMMRegLane32F( rG, 4, CVT(t4) );
   putYMMRegLane32F( rG, 3, CVT(t3) );
   putYMMRegLane32F( rG, 2, CVT(t2) );
   putYMMRegLane32F( rG, 1, CVT(t1) );
   putYMMRegLane32F( rG, 0, CVT(t0) );
#  undef CVT

   return delta;
}


static Long dis_PMOVMSKB_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx )
{
   UChar modrm = getUChar(delta);
   vassert(epartIsReg(modrm)); /* ensured by caller */
   UInt   rE = eregOfRexRM(pfx,modrm);
   UInt   rG = gregOfRexRM(pfx,modrm);
   IRTemp t0 = newTemp(Ity_V128);
   IRTemp t1 = newTemp(Ity_I32);
   assign(t0, getXMMReg(rE));
   assign(t1, unop(Iop_16Uto32, unop(Iop_GetMSBs8x16, mkexpr(t0))));
   putIReg32(rG, mkexpr(t1));
   DIP("%spmovmskb %s,%s\n", isAvx ? "v" : "", nameXMMReg(rE),
       nameIReg32(rG));
   delta += 1;
   return delta;
}


static Long dis_PMOVMSKB_256 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta  )
{
   UChar modrm = getUChar(delta);
   vassert(epartIsReg(modrm)); /* ensured by caller */
   UInt   rE = eregOfRexRM(pfx,modrm);
   UInt   rG = gregOfRexRM(pfx,modrm);
   IRTemp t0 = newTemp(Ity_V128);
   IRTemp t1 = newTemp(Ity_V128);
   IRTemp t2 = newTemp(Ity_I16);
   IRTemp t3 = newTemp(Ity_I16);
   assign(t0, getYMMRegLane128(rE, 0));
   assign(t1, getYMMRegLane128(rE, 1));
   assign(t2, unop(Iop_GetMSBs8x16, mkexpr(t0)));
   assign(t3, unop(Iop_GetMSBs8x16, mkexpr(t1)));
   putIReg32(rG, binop(Iop_16HLto32, mkexpr(t3), mkexpr(t2)));
   DIP("vpmovmskb %s,%s\n", nameYMMReg(rE), nameIReg32(rG));
   delta += 1;
   return delta;
}


/* FIXME: why not just use InterleaveLO / InterleaveHI?  I think the
   relevant ops are "xIsH ? InterleaveHI32x4 : InterleaveLO32x4". */
/* Does the maths for 128 bit versions of UNPCKLPS and UNPCKHPS */
static IRTemp math_UNPCKxPS_128 ( IRTemp sV, IRTemp dV, Bool xIsH )
{
   IRTemp s3, s2, s1, s0, d3, d2, d1, d0;
   s3 = s2 = s1 = s0 = d3 = d2 = d1 = d0 = IRTemp_INVALID;
   breakupV128to32s( dV, &d3, &d2, &d1, &d0 );
   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );
   IRTemp res = newTemp(Ity_V128);
   assign(res,  xIsH ? mkV128from32s( s3, d3, s2, d2 )
                     : mkV128from32s( s1, d1, s0, d0 ));
   return res;
}


/* FIXME: why not just use InterleaveLO / InterleaveHI ?? */
/* Does the maths for 128 bit versions of UNPCKLPD and UNPCKHPD */
static IRTemp math_UNPCKxPD_128 ( IRTemp sV, IRTemp dV, Bool xIsH )
{
   IRTemp s1 = newTemp(Ity_I64);
   IRTemp s0 = newTemp(Ity_I64);
   IRTemp d1 = newTemp(Ity_I64);
   IRTemp d0 = newTemp(Ity_I64);
   assign( d1, unop(Iop_V128HIto64, mkexpr(dV)) );
   assign( d0, unop(Iop_V128to64,   mkexpr(dV)) );
   assign( s1, unop(Iop_V128HIto64, mkexpr(sV)) );
   assign( s0, unop(Iop_V128to64,   mkexpr(sV)) );
   IRTemp res = newTemp(Ity_V128);
   assign(res, xIsH ? binop(Iop_64HLtoV128, mkexpr(s1), mkexpr(d1))
                    : binop(Iop_64HLtoV128, mkexpr(s0), mkexpr(d0)));
   return res;
}


/* Does the maths for 256 bit versions of UNPCKLPD and UNPCKHPD.
   Doesn't seem like this fits in either of the Iop_Interleave{LO,HI}
   or the Iop_Cat{Odd,Even}Lanes idioms, hence just do it the stupid
   way. */
static IRTemp math_UNPCKxPD_256 ( IRTemp sV, IRTemp dV, Bool xIsH )
{
   IRTemp s3, s2, s1, s0, d3, d2, d1, d0;
   s3 = s2 = s1 = s0 = d3 = d2 = d1 = d0 = IRTemp_INVALID;
   breakupV256to64s( dV, &d3, &d2, &d1, &d0 );
   breakupV256to64s( sV, &s3, &s2, &s1, &s0 );
   IRTemp res = newTemp(Ity_V256);
   assign(res, xIsH
               ? IRExpr_Qop(Iop_64x4toV256, mkexpr(s3), mkexpr(d3),
                                            mkexpr(s1), mkexpr(d1))
               : IRExpr_Qop(Iop_64x4toV256, mkexpr(s2), mkexpr(d2),
                                            mkexpr(s0), mkexpr(d0)));
   return res;
}


/* FIXME: this is really bad.  Surely can do something better here?
   One observation is that the steering in the upper and lower 128 bit
   halves is the same as with math_UNPCKxPS_128, so we simply split
   into two halves, and use that.  Consequently any improvement in
   math_UNPCKxPS_128 (probably, to use interleave-style primops)
   benefits this too. */
static IRTemp math_UNPCKxPS_256 ( IRTemp sV, IRTemp dV, Bool xIsH )
{
   IRTemp sVhi = IRTemp_INVALID, sVlo = IRTemp_INVALID;
   IRTemp dVhi = IRTemp_INVALID, dVlo = IRTemp_INVALID;
   breakupV256toV128s( sV, &sVhi, &sVlo );
   breakupV256toV128s( dV, &dVhi, &dVlo );
   IRTemp rVhi = math_UNPCKxPS_128(sVhi, dVhi, xIsH);
   IRTemp rVlo = math_UNPCKxPS_128(sVlo, dVlo, xIsH);
   IRTemp rV   = newTemp(Ity_V256);
   assign(rV, binop(Iop_V128HLtoV256, mkexpr(rVhi), mkexpr(rVlo)));
   return rV;
}


static IRTemp math_SHUFPS_128 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   IRTemp s3, s2, s1, s0, d3, d2, d1, d0;
   s3 = s2 = s1 = s0 = d3 = d2 = d1 = d0 = IRTemp_INVALID;
   vassert(imm8 < 256);

   breakupV128to32s( dV, &d3, &d2, &d1, &d0 );
   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );

#  define SELD(n) ((n)==0 ? d0 : ((n)==1 ? d1 : ((n)==2 ? d2 : d3)))
#  define SELS(n) ((n)==0 ? s0 : ((n)==1 ? s1 : ((n)==2 ? s2 : s3)))
   IRTemp res = newTemp(Ity_V128);
   assign(res,
          mkV128from32s( SELS((imm8>>6)&3), SELS((imm8>>4)&3),
                         SELD((imm8>>2)&3), SELD((imm8>>0)&3) ) );
#  undef SELD
#  undef SELS
   return res;
}


/* 256-bit SHUFPS appears to steer each of the 128-bit halves
   identically.  Hence do the clueless thing and use math_SHUFPS_128
   twice. */
static IRTemp math_SHUFPS_256 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   IRTemp sVhi = IRTemp_INVALID, sVlo = IRTemp_INVALID;
   IRTemp dVhi = IRTemp_INVALID, dVlo = IRTemp_INVALID;
   breakupV256toV128s( sV, &sVhi, &sVlo );
   breakupV256toV128s( dV, &dVhi, &dVlo );
   IRTemp rVhi = math_SHUFPS_128(sVhi, dVhi, imm8);
   IRTemp rVlo = math_SHUFPS_128(sVlo, dVlo, imm8);
   IRTemp rV   = newTemp(Ity_V256);
   assign(rV, binop(Iop_V128HLtoV256, mkexpr(rVhi), mkexpr(rVlo)));
   return rV;
}


static IRTemp math_SHUFPD_128 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   IRTemp s1 = newTemp(Ity_I64);
   IRTemp s0 = newTemp(Ity_I64);
   IRTemp d1 = newTemp(Ity_I64);
   IRTemp d0 = newTemp(Ity_I64);

   assign( d1, unop(Iop_V128HIto64, mkexpr(dV)) );
   assign( d0, unop(Iop_V128to64,   mkexpr(dV)) );
   assign( s1, unop(Iop_V128HIto64, mkexpr(sV)) );
   assign( s0, unop(Iop_V128to64,   mkexpr(sV)) );

#  define SELD(n) mkexpr((n)==0 ? d0 : d1)
#  define SELS(n) mkexpr((n)==0 ? s0 : s1)

   IRTemp res = newTemp(Ity_V128);
   assign(res, binop( Iop_64HLtoV128,
                      SELS((imm8>>1)&1), SELD((imm8>>0)&1) ) );

#  undef SELD
#  undef SELS
   return res;
}


static IRTemp math_SHUFPD_256 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   IRTemp sVhi = IRTemp_INVALID, sVlo = IRTemp_INVALID;
   IRTemp dVhi = IRTemp_INVALID, dVlo = IRTemp_INVALID;
   breakupV256toV128s( sV, &sVhi, &sVlo );
   breakupV256toV128s( dV, &dVhi, &dVlo );
   IRTemp rVhi = math_SHUFPD_128(sVhi, dVhi, (imm8 >> 2) & 3);
   IRTemp rVlo = math_SHUFPD_128(sVlo, dVlo, imm8 & 3);
   IRTemp rV   = newTemp(Ity_V256);
   assign(rV, binop(Iop_V128HLtoV256, mkexpr(rVhi), mkexpr(rVlo)));
   return rV;
}


static IRTemp math_BLENDPD_128 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   UShort imm8_mask_16;
   IRTemp imm8_mask = newTemp(Ity_V128);

   switch( imm8 & 3 ) {
      case 0:  imm8_mask_16 = 0x0000; break;
      case 1:  imm8_mask_16 = 0x00FF; break;
      case 2:  imm8_mask_16 = 0xFF00; break;
      case 3:  imm8_mask_16 = 0xFFFF; break;
      default: vassert(0);            break;
   }
   assign( imm8_mask, mkV128( imm8_mask_16 ) );

   IRTemp res = newTemp(Ity_V128);
   assign ( res, binop( Iop_OrV128,
                        binop( Iop_AndV128, mkexpr(sV),
                                            mkexpr(imm8_mask) ),
                        binop( Iop_AndV128, mkexpr(dV),
                               unop( Iop_NotV128, mkexpr(imm8_mask) ) ) ) );
   return res;
}


static IRTemp math_BLENDPD_256 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   IRTemp sVhi = IRTemp_INVALID, sVlo = IRTemp_INVALID;
   IRTemp dVhi = IRTemp_INVALID, dVlo = IRTemp_INVALID;
   breakupV256toV128s( sV, &sVhi, &sVlo );
   breakupV256toV128s( dV, &dVhi, &dVlo );
   IRTemp rVhi = math_BLENDPD_128(sVhi, dVhi, (imm8 >> 2) & 3);
   IRTemp rVlo = math_BLENDPD_128(sVlo, dVlo, imm8 & 3);
   IRTemp rV   = newTemp(Ity_V256);
   assign(rV, binop(Iop_V128HLtoV256, mkexpr(rVhi), mkexpr(rVlo)));
   return rV;
}


static IRTemp math_BLENDPS_128 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   UShort imm8_perms[16] = { 0x0000, 0x000F, 0x00F0, 0x00FF, 0x0F00,
                             0x0F0F, 0x0FF0, 0x0FFF, 0xF000, 0xF00F,
                             0xF0F0, 0xF0FF, 0xFF00, 0xFF0F, 0xFFF0,
                             0xFFFF };
   IRTemp imm8_mask = newTemp(Ity_V128);
   assign( imm8_mask, mkV128( imm8_perms[ (imm8 & 15) ] ) );

   IRTemp res = newTemp(Ity_V128);
   assign ( res, binop( Iop_OrV128,
                        binop( Iop_AndV128, mkexpr(sV),
                                            mkexpr(imm8_mask) ),
                        binop( Iop_AndV128, mkexpr(dV),
                               unop( Iop_NotV128, mkexpr(imm8_mask) ) ) ) );
   return res;
}


static IRTemp math_BLENDPS_256 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   IRTemp sVhi = IRTemp_INVALID, sVlo = IRTemp_INVALID;
   IRTemp dVhi = IRTemp_INVALID, dVlo = IRTemp_INVALID;
   breakupV256toV128s( sV, &sVhi, &sVlo );
   breakupV256toV128s( dV, &dVhi, &dVlo );
   IRTemp rVhi = math_BLENDPS_128(sVhi, dVhi, (imm8 >> 4) & 15);
   IRTemp rVlo = math_BLENDPS_128(sVlo, dVlo, imm8 & 15);
   IRTemp rV   = newTemp(Ity_V256);
   assign(rV, binop(Iop_V128HLtoV256, mkexpr(rVhi), mkexpr(rVlo)));
   return rV;
}


static IRTemp math_PBLENDW_128 ( IRTemp sV, IRTemp dV, UInt imm8 )
{
   /* Make w be a 16-bit version of imm8, formed by duplicating each
      bit in imm8. */
   Int i;
   UShort imm16 = 0;
   for (i = 0; i < 8; i++) {
      if (imm8 & (1 << i))
         imm16 |= (3 << (2*i));
   }
   IRTemp imm16_mask = newTemp(Ity_V128);
   assign( imm16_mask, mkV128( imm16 ));

   IRTemp res = newTemp(Ity_V128);
   assign ( res, binop( Iop_OrV128,
                        binop( Iop_AndV128, mkexpr(sV),
                                            mkexpr(imm16_mask) ),
                        binop( Iop_AndV128, mkexpr(dV),
                               unop( Iop_NotV128, mkexpr(imm16_mask) ) ) ) );
   return res;
}


static IRTemp math_PMULUDQ_128 ( IRTemp sV, IRTemp dV )
{
   /* This is a really poor translation -- could be improved if
      performance critical */
   IRTemp s3, s2, s1, s0, d3, d2, d1, d0;
   s3 = s2 = s1 = s0 = d3 = d2 = d1 = d0 = IRTemp_INVALID;
   breakupV128to32s( dV, &d3, &d2, &d1, &d0 );
   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );
   IRTemp res = newTemp(Ity_V128);
   assign(res, binop(Iop_64HLtoV128,
                     binop( Iop_MullU32, mkexpr(d2), mkexpr(s2)),
                     binop( Iop_MullU32, mkexpr(d0), mkexpr(s0)) ));
   return res;
}


static IRTemp math_PMULUDQ_256 ( IRTemp sV, IRTemp dV )
{
   /* This is a really poor translation -- could be improved if
      performance critical */
   IRTemp sHi, sLo, dHi, dLo;
   sHi = sLo = dHi = dLo = IRTemp_INVALID;
   breakupV256toV128s( dV, &dHi, &dLo);
   breakupV256toV128s( sV, &sHi, &sLo);
   IRTemp res = newTemp(Ity_V256);
   assign(res, binop(Iop_V128HLtoV256,
                     mkexpr(math_PMULUDQ_128(sHi, dHi)),
                     mkexpr(math_PMULUDQ_128(sLo, dLo))));
   return res;
}


static IRTemp math_PMULDQ_128 ( IRTemp dV, IRTemp sV )
{
   /* This is a really poor translation -- could be improved if
      performance critical */
   IRTemp s3, s2, s1, s0, d3, d2, d1, d0;
   s3 = s2 = s1 = s0 = d3 = d2 = d1 = d0 = IRTemp_INVALID;
   breakupV128to32s( dV, &d3, &d2, &d1, &d0 );
   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );
   IRTemp res = newTemp(Ity_V128);
   assign(res, binop(Iop_64HLtoV128,
                     binop( Iop_MullS32, mkexpr(d2), mkexpr(s2)),
                     binop( Iop_MullS32, mkexpr(d0), mkexpr(s0)) ));
   return res;
}


static IRTemp math_PMULDQ_256 ( IRTemp sV, IRTemp dV )
{
   /* This is a really poor translation -- could be improved if
      performance critical */
   IRTemp sHi, sLo, dHi, dLo;
   sHi = sLo = dHi = dLo = IRTemp_INVALID;
   breakupV256toV128s( dV, &dHi, &dLo);
   breakupV256toV128s( sV, &sHi, &sLo);
   IRTemp res = newTemp(Ity_V256);
   assign(res, binop(Iop_V128HLtoV256,
                     mkexpr(math_PMULDQ_128(sHi, dHi)),
                     mkexpr(math_PMULDQ_128(sLo, dLo))));
   return res;
}


static IRTemp math_PMADDWD_128 ( IRTemp dV, IRTemp sV )
{
   IRTemp sVhi, sVlo, dVhi, dVlo;
   IRTemp resHi = newTemp(Ity_I64);
   IRTemp resLo = newTemp(Ity_I64);
   sVhi = sVlo = dVhi = dVlo = IRTemp_INVALID;
   breakupV128to64s( sV, &sVhi, &sVlo );
   breakupV128to64s( dV, &dVhi, &dVlo );
   assign( resHi, mkIRExprCCall(Ity_I64, 0/*regparms*/,
                                "amd64g_calculate_mmx_pmaddwd",
                                &amd64g_calculate_mmx_pmaddwd,
                                mkIRExprVec_2( mkexpr(sVhi), mkexpr(dVhi))));
   assign( resLo, mkIRExprCCall(Ity_I64, 0/*regparms*/,
                                "amd64g_calculate_mmx_pmaddwd",
                                &amd64g_calculate_mmx_pmaddwd,
                                mkIRExprVec_2( mkexpr(sVlo), mkexpr(dVlo))));
   IRTemp res = newTemp(Ity_V128);
   assign( res, binop(Iop_64HLtoV128, mkexpr(resHi), mkexpr(resLo))) ;
   return res;
}


static IRTemp math_PMADDWD_256 ( IRTemp dV, IRTemp sV )
{
   IRTemp sHi, sLo, dHi, dLo;
   sHi = sLo = dHi = dLo = IRTemp_INVALID;
   breakupV256toV128s( dV, &dHi, &dLo);
   breakupV256toV128s( sV, &sHi, &sLo);
   IRTemp res = newTemp(Ity_V256);
   assign(res, binop(Iop_V128HLtoV256,
                     mkexpr(math_PMADDWD_128(dHi, sHi)),
                     mkexpr(math_PMADDWD_128(dLo, sLo))));
   return res;
}


static IRTemp math_ADDSUBPD_128 ( IRTemp dV, IRTemp sV )
{
   IRTemp addV = newTemp(Ity_V128);
   IRTemp subV = newTemp(Ity_V128);
   IRTemp a1   = newTemp(Ity_I64);
   IRTemp s0   = newTemp(Ity_I64);
   IRTemp rm   = newTemp(Ity_I32);

   assign( rm, get_FAKE_roundingmode() ); /* XXXROUNDINGFIXME */
   assign( addV, triop(Iop_Add64Fx2, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );
   assign( subV, triop(Iop_Sub64Fx2, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );

   assign( a1, unop(Iop_V128HIto64, mkexpr(addV) ));
   assign( s0, unop(Iop_V128to64,   mkexpr(subV) ));

   IRTemp res = newTemp(Ity_V128);
   assign( res, binop(Iop_64HLtoV128, mkexpr(a1), mkexpr(s0)) );
   return res;
}


static IRTemp math_ADDSUBPD_256 ( IRTemp dV, IRTemp sV )
{
   IRTemp a3, a2, a1, a0, s3, s2, s1, s0;
   IRTemp addV = newTemp(Ity_V256);
   IRTemp subV = newTemp(Ity_V256);
   IRTemp rm   = newTemp(Ity_I32);
   a3 = a2 = a1 = a0 = s3 = s2 = s1 = s0 = IRTemp_INVALID;

   assign( rm, get_FAKE_roundingmode() ); /* XXXROUNDINGFIXME */
   assign( addV, triop(Iop_Add64Fx4, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );
   assign( subV, triop(Iop_Sub64Fx4, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );

   breakupV256to64s( addV, &a3, &a2, &a1, &a0 );
   breakupV256to64s( subV, &s3, &s2, &s1, &s0 );

   IRTemp res = newTemp(Ity_V256);
   assign( res, mkV256from64s( a3, s2, a1, s0 ) );
   return res;
}


static IRTemp math_ADDSUBPS_128 ( IRTemp dV, IRTemp sV )
{
   IRTemp a3, a2, a1, a0, s3, s2, s1, s0;
   IRTemp addV = newTemp(Ity_V128);
   IRTemp subV = newTemp(Ity_V128);
   IRTemp rm   = newTemp(Ity_I32);
   a3 = a2 = a1 = a0 = s3 = s2 = s1 = s0 = IRTemp_INVALID;

   assign( rm, get_FAKE_roundingmode() ); /* XXXROUNDINGFIXME */
   assign( addV, triop(Iop_Add32Fx4, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );
   assign( subV, triop(Iop_Sub32Fx4, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );

   breakupV128to32s( addV, &a3, &a2, &a1, &a0 );
   breakupV128to32s( subV, &s3, &s2, &s1, &s0 );

   IRTemp res = newTemp(Ity_V128);
   assign( res, mkV128from32s( a3, s2, a1, s0 ) );
   return res;
}


static IRTemp math_ADDSUBPS_256 ( IRTemp dV, IRTemp sV )
{
   IRTemp a7, a6, a5, a4, a3, a2, a1, a0;
   IRTemp s7, s6, s5, s4, s3, s2, s1, s0;
   IRTemp addV = newTemp(Ity_V256);
   IRTemp subV = newTemp(Ity_V256);
   IRTemp rm   = newTemp(Ity_I32);
   a7 = a6 = a5 = a4 = a3 = a2 = a1 = a0 = IRTemp_INVALID;
   s7 = s6 = s5 = s4 = s3 = s2 = s1 = s0 = IRTemp_INVALID;

   assign( rm, get_FAKE_roundingmode() ); /* XXXROUNDINGFIXME */
   assign( addV, triop(Iop_Add32Fx8, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );
   assign( subV, triop(Iop_Sub32Fx8, mkexpr(rm), mkexpr(dV), mkexpr(sV)) );

   breakupV256to32s( addV, &a7, &a6, &a5, &a4, &a3, &a2, &a1, &a0 );
   breakupV256to32s( subV, &s7, &s6, &s5, &s4, &s3, &s2, &s1, &s0 );

   IRTemp res = newTemp(Ity_V256);
   assign( res, mkV256from32s( a7, s6, a5, s4, a3, s2, a1, s0 ) );
   return res;
}


/* Handle 128 bit PSHUFLW and PSHUFHW. */
static Long dis_PSHUFxW_128 ( const VexAbiInfo* vbi, Prefix pfx,
                              Long delta, Bool isAvx, Bool xIsH )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   UInt   rG = gregOfRexRM(pfx,modrm);
   UInt   imm8;
   IRTemp sVmut, dVmut, sVcon, sV, dV, s3, s2, s1, s0;
   s3 = s2 = s1 = s0 = IRTemp_INVALID;
   sV    = newTemp(Ity_V128);
   dV    = newTemp(Ity_V128);
   sVmut = newTemp(Ity_I64);
   dVmut = newTemp(Ity_I64);
   sVcon = newTemp(Ity_I64);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( sV, getXMMReg(rE) );
      imm8 = (UInt)getUChar(delta+1);
      delta += 1+1;
      DIP("%spshuf%cw $%u,%s,%s\n",
          isAvx ? "v" : "", xIsH ? 'h' : 'l',
          imm8, nameXMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 1 );
      assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
      imm8 = (UInt)getUChar(delta+alen);
      delta += alen+1;
      DIP("%spshuf%cw $%u,%s,%s\n",
          isAvx ? "v" : "", xIsH ? 'h' : 'l',
          imm8, dis_buf, nameXMMReg(rG));
   }

   /* Get the to-be-changed (mut) and unchanging (con) bits of the
      source. */
   assign( sVmut, unop(xIsH ? Iop_V128HIto64 : Iop_V128to64,   mkexpr(sV)) );
   assign( sVcon, unop(xIsH ? Iop_V128to64   : Iop_V128HIto64, mkexpr(sV)) );

   breakup64to16s( sVmut, &s3, &s2, &s1, &s0 );
#  define SEL(n) \
             ((n)==0 ? s0 : ((n)==1 ? s1 : ((n)==2 ? s2 : s3)))
   assign(dVmut, mk64from16s( SEL((imm8>>6)&3), SEL((imm8>>4)&3),
                              SEL((imm8>>2)&3), SEL((imm8>>0)&3) ));
#  undef SEL

   assign(dV, xIsH ? binop(Iop_64HLtoV128, mkexpr(dVmut), mkexpr(sVcon))
                   : binop(Iop_64HLtoV128, mkexpr(sVcon), mkexpr(dVmut)) );

   (isAvx ? putYMMRegLoAndZU : putXMMReg)(rG, mkexpr(dV));
   return delta;
}


/* Handle 256 bit PSHUFLW and PSHUFHW. */
static Long dis_PSHUFxW_256 ( const VexAbiInfo* vbi, Prefix pfx,
                              Long delta, Bool xIsH )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   UInt   rG = gregOfRexRM(pfx,modrm);
   UInt   imm8;
   IRTemp sV, s[8], sV64[4], dVhi, dVlo;
   sV64[3] = sV64[2] = sV64[1] = sV64[0] = IRTemp_INVALID;
   s[7] = s[6] = s[5] = s[4] = s[3] = s[2] = s[1] = s[0] = IRTemp_INVALID;
   sV    = newTemp(Ity_V256);
   dVhi  = newTemp(Ity_I64);
   dVlo  = newTemp(Ity_I64);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( sV, getYMMReg(rE) );
      imm8 = (UInt)getUChar(delta+1);
      delta += 1+1;
      DIP("vpshuf%cw $%u,%s,%s\n", xIsH ? 'h' : 'l',
          imm8, nameYMMReg(rE), nameYMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 1 );
      assign( sV, loadLE(Ity_V256, mkexpr(addr)) );
      imm8 = (UInt)getUChar(delta+alen);
      delta += alen+1;
      DIP("vpshuf%cw $%u,%s,%s\n", xIsH ? 'h' : 'l',
          imm8, dis_buf, nameYMMReg(rG));
   }

   breakupV256to64s( sV, &sV64[3], &sV64[2], &sV64[1], &sV64[0] );
   breakup64to16s( sV64[xIsH ? 3 : 2], &s[7], &s[6], &s[5], &s[4] );
   breakup64to16s( sV64[xIsH ? 1 : 0], &s[3], &s[2], &s[1], &s[0] );

   assign( dVhi, mk64from16s( s[4 + ((imm8>>6)&3)], s[4 + ((imm8>>4)&3)],
                              s[4 + ((imm8>>2)&3)], s[4 + ((imm8>>0)&3)] ) );
   assign( dVlo, mk64from16s( s[0 + ((imm8>>6)&3)], s[0 + ((imm8>>4)&3)],
                              s[0 + ((imm8>>2)&3)], s[0 + ((imm8>>0)&3)] ) );
   putYMMReg( rG, mkV256from64s( xIsH ? dVhi : sV64[3],
                                 xIsH ? sV64[2] : dVhi,
                                 xIsH ? dVlo : sV64[1],
                                 xIsH ? sV64[0] : dVlo ) );
   return delta;
}


static Long dis_PEXTRW_128_EregOnly_toG ( const VexAbiInfo* vbi, Prefix pfx,
                                          Long delta, Bool isAvx )
{
   Long   deltaIN = delta;
   UChar  modrm   = getUChar(delta);
   UInt   rG      = gregOfRexRM(pfx,modrm);
   IRTemp sV      = newTemp(Ity_V128);
   IRTemp d16     = newTemp(Ity_I16);
   UInt   imm8;
   IRTemp s0, s1, s2, s3;
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign(sV, getXMMReg(rE));
      imm8 = getUChar(delta+1) & 7;
      delta += 1+1;
      DIP("%spextrw $%u,%s,%s\n", isAvx ? "v" : "",
          imm8, nameXMMReg(rE), nameIReg32(rG));
   } else {
      /* The memory case is disallowed, apparently. */
      return deltaIN; /* FAIL */
   }
   s3 = s2 = s1 = s0 = IRTemp_INVALID;
   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );
   switch (imm8) {
      case 0:  assign(d16, unop(Iop_32to16,   mkexpr(s0))); break;
      case 1:  assign(d16, unop(Iop_32HIto16, mkexpr(s0))); break;
      case 2:  assign(d16, unop(Iop_32to16,   mkexpr(s1))); break;
      case 3:  assign(d16, unop(Iop_32HIto16, mkexpr(s1))); break;
      case 4:  assign(d16, unop(Iop_32to16,   mkexpr(s2))); break;
      case 5:  assign(d16, unop(Iop_32HIto16, mkexpr(s2))); break;
      case 6:  assign(d16, unop(Iop_32to16,   mkexpr(s3))); break;
      case 7:  assign(d16, unop(Iop_32HIto16, mkexpr(s3))); break;
      default: vassert(0);
   }
   putIReg32(rG, unop(Iop_16Uto32, mkexpr(d16)));
   return delta;
}


static Long dis_CVTDQ2PD_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   IRTemp arg64 = newTemp(Ity_I64);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   const HChar* mbV   = isAvx ? "v" : "";
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( arg64, getXMMRegLane64(rE, 0) );
      delta += 1;
      DIP("%scvtdq2pd %s,%s\n", mbV, nameXMMReg(rE), nameXMMReg(rG));
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( arg64, loadLE(Ity_I64, mkexpr(addr)) );
      delta += alen;
      DIP("%scvtdq2pd %s,%s\n", mbV, dis_buf, nameXMMReg(rG) );
   }
   putXMMRegLane64F(
      rG, 0,
      unop(Iop_I32StoF64, unop(Iop_64to32, mkexpr(arg64)))
   );
   putXMMRegLane64F(
      rG, 1,
      unop(Iop_I32StoF64, unop(Iop_64HIto32, mkexpr(arg64)))
   );
   if (isAvx)
      putYMMRegLane128(rG, 1, mkV128(0));
   return delta;
}


static Long dis_STMXCSR ( const VexAbiInfo* vbi, Prefix pfx,
                          Long delta, Bool isAvx )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   vassert(!epartIsReg(modrm)); /* ensured by caller */
   vassert(gregOfRexRM(pfx,modrm) == 3); /* ditto */

   addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
   delta += alen;

   /* Fake up a native SSE mxcsr word.  The only thing it depends on
      is SSEROUND[1:0], so call a clean helper to cook it up.
   */
   /* ULong amd64h_create_mxcsr ( ULong sseround ) */
   DIP("%sstmxcsr %s\n",  isAvx ? "v" : "", dis_buf);
   storeLE(
      mkexpr(addr),
      unop(Iop_64to32,
           mkIRExprCCall(
              Ity_I64, 0/*regp*/,
              "amd64g_create_mxcsr", &amd64g_create_mxcsr,
              mkIRExprVec_1( unop(Iop_32Uto64,get_sse_roundingmode()) )
           )
      )
   );
   return delta;
}


static Long dis_LDMXCSR ( const VexAbiInfo* vbi, Prefix pfx,
                          Long delta, Bool isAvx )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   vassert(!epartIsReg(modrm)); /* ensured by caller */
   vassert(gregOfRexRM(pfx,modrm) == 2); /* ditto */

   IRTemp t64 = newTemp(Ity_I64);
   IRTemp ew  = newTemp(Ity_I32);

   addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
   delta += alen;
   DIP("%sldmxcsr %s\n",  isAvx ? "v" : "", dis_buf);

   /* The only thing we observe in %mxcsr is the rounding mode.
      Therefore, pass the 32-bit value (SSE native-format control
      word) to a clean helper, getting back a 64-bit value, the
      lower half of which is the SSEROUND value to store, and the
      upper half of which is the emulation-warning token which may
      be generated.
   */
   /* ULong amd64h_check_ldmxcsr ( ULong ); */
   assign( t64, mkIRExprCCall(
                   Ity_I64, 0/*regparms*/,
                   "amd64g_check_ldmxcsr",
                   &amd64g_check_ldmxcsr,
                   mkIRExprVec_1(
                      unop(Iop_32Uto64,
                           loadLE(Ity_I32, mkexpr(addr))
                      )
                   )
                )
         );

   put_sse_roundingmode( unop(Iop_64to32, mkexpr(t64)) );
   assign( ew, unop(Iop_64HIto32, mkexpr(t64) ) );
   put_emwarn( mkexpr(ew) );
   /* Finally, if an emulation warning was reported, side-exit to
      the next insn, reporting the warning, so that Valgrind's
      dispatcher sees the warning. */
   stmt(
      IRStmt_Exit(
         binop(Iop_CmpNE64, unop(Iop_32Uto64,mkexpr(ew)), mkU64(0)),
         Ijk_EmWarn,
         IRConst_U64(guest_RIP_bbstart+delta),
         OFFB_RIP
      )
   );
   return delta;
}


static void gen_XSAVE_SEQUENCE ( IRTemp addr, IRTemp rfbm )
{
   /* ------ rfbm[0] gates the x87 state ------ */

   /* Uses dirty helper:
         void amd64g_do_XSAVE_COMPONENT_0 ( VexGuestAMD64State*, ULong )
   */
   IRDirty* d0 = unsafeIRDirty_0_N (
                    0/*regparms*/,
                    "amd64g_dirtyhelper_XSAVE_COMPONENT_0",
                    &amd64g_dirtyhelper_XSAVE_COMPONENT_0,
                    mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                 );
   d0->guard = binop(Iop_CmpEQ64, binop(Iop_And64, mkexpr(rfbm), mkU64(1)),
                     mkU64(1));

   /* Declare we're writing memory.  Really, bytes 24 through 31
      (MXCSR and MXCSR_MASK) aren't written, but we can't express more
      than 1 memory area here, so just mark the whole thing as
      written. */
   d0->mFx   = Ifx_Write;
   d0->mAddr = mkexpr(addr);
   d0->mSize = 160;

   /* declare we're reading guest state */
   d0->nFxState = 5;
   vex_bzero(&d0->fxState, sizeof(d0->fxState));

   d0->fxState[0].fx     = Ifx_Read;
   d0->fxState[0].offset = OFFB_FTOP;
   d0->fxState[0].size   = sizeof(UInt);

   d0->fxState[1].fx     = Ifx_Read;
   d0->fxState[1].offset = OFFB_FPREGS;
   d0->fxState[1].size   = 8 * sizeof(ULong);

   d0->fxState[2].fx     = Ifx_Read;
   d0->fxState[2].offset = OFFB_FPTAGS;
   d0->fxState[2].size   = 8 * sizeof(UChar);

   d0->fxState[3].fx     = Ifx_Read;
   d0->fxState[3].offset = OFFB_FPROUND;
   d0->fxState[3].size   = sizeof(ULong);

   d0->fxState[4].fx     = Ifx_Read;
   d0->fxState[4].offset = OFFB_FC3210;
   d0->fxState[4].size   = sizeof(ULong);

   stmt( IRStmt_Dirty(d0) );

   /* ------ rfbm[1] gates the SSE state ------ */

   IRTemp rfbm_1    = newTemp(Ity_I64);
   IRTemp rfbm_1or2 = newTemp(Ity_I64);
   assign(rfbm_1,    binop(Iop_And64, mkexpr(rfbm), mkU64(2)));
   assign(rfbm_1or2, binop(Iop_And64, mkexpr(rfbm), mkU64(6)));

   IRExpr* guard_1    = binop(Iop_CmpEQ64, mkexpr(rfbm_1),    mkU64(2));
   IRExpr* guard_1or2 = binop(Iop_CmpNE64, mkexpr(rfbm_1or2), mkU64(0));

   /* Uses dirty helper:
         void amd64g_do_XSAVE_COMPONENT_1_EXCLUDING_XMMREGS
                 ( VexGuestAMD64State*, ULong )
      This creates only MXCSR and MXCSR_MASK.  We need to do this if
      either components 1 (SSE) or 2 (AVX) are requested.  Hence the
      guard condition is a bit more complex.
   */
   IRDirty* d1 = unsafeIRDirty_0_N (
                    0/*regparms*/,
                    "amd64g_dirtyhelper_XSAVE_COMPONENT_1_EXCLUDING_XMMREGS",
                    &amd64g_dirtyhelper_XSAVE_COMPONENT_1_EXCLUDING_XMMREGS,
                    mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                 );
   d1->guard = guard_1or2;

   /* Declare we're writing memory: MXCSR and MXCSR_MASK.  Note that
      the code for rbfm[0] just above claims a write of 0 .. 159, so
      this duplicates it.  But at least correctly connects 24 .. 31 to
      the MXCSR guest state representation (SSEROUND field). */
   d1->mFx   = Ifx_Write;
   d1->mAddr = binop(Iop_Add64, mkexpr(addr), mkU64(24));
   d1->mSize = 8;

   /* declare we're reading guest state */
   d1->nFxState = 1;
   vex_bzero(&d1->fxState, sizeof(d1->fxState));

   d1->fxState[0].fx     = Ifx_Read;
   d1->fxState[0].offset = OFFB_SSEROUND;
   d1->fxState[0].size   = sizeof(ULong);

   /* Call the helper.  This creates MXCSR and MXCSR_MASK but nothing
      else.  We do the actual register array, XMM[0..15], separately,
      in order that any undefinedness in the XMM registers is tracked
      separately by Memcheck and does not "infect" the in-memory
      shadow for the other parts of the image. */
   stmt( IRStmt_Dirty(d1) );

   /* And now the XMMs themselves. */
   UInt reg;
   for (reg = 0; reg < 16; reg++) {
      stmt( IRStmt_StoreG(
               Iend_LE,
               binop(Iop_Add64, mkexpr(addr), mkU64(160 + reg * 16)),
               getXMMReg(reg),
               guard_1
      ));
   }

   /* ------ rfbm[2] gates the AVX state ------ */
   /* Component 2 is just a bunch of register saves, so we'll do it
      inline, just to be simple and to be Memcheck friendly. */

   IRTemp rfbm_2 = newTemp(Ity_I64);
   assign(rfbm_2, binop(Iop_And64, mkexpr(rfbm), mkU64(4)));

   IRExpr* guard_2 = binop(Iop_CmpEQ64, mkexpr(rfbm_2), mkU64(4));

   for (reg = 0; reg < 16; reg++) {
      stmt( IRStmt_StoreG(
               Iend_LE,
               binop(Iop_Add64, mkexpr(addr), mkU64(576 + reg * 16)),
               getYMMRegLane128(reg,1),
               guard_2
      ));
   }
}


static Long dis_XSAVE ( const VexAbiInfo* vbi,
                        Prefix pfx, Long delta, Int sz )
{
   /* Note that the presence or absence of REX.W (indicated here by
      |sz|) slightly affects the written format: whether the saved FPU
      IP and DP pointers are 64 or 32 bits.  But the helper function
      we call simply writes zero bits in the relevant fields, which
      are 64 bits regardless of what REX.W is, and so it's good enough
      (iow, equally broken) in both cases. */
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   vassert(!epartIsReg(modrm)); /* ensured by caller */
   vassert(sz == 4 || sz == 8); /* ditto */

   addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
   delta += alen;
   gen_SEGV_if_not_64_aligned(addr);

   DIP("%sxsave %s\n", sz==8 ? "rex64/" : "", dis_buf);

   /* VEX's caller is assumed to have checked this. */
   const ULong aSSUMED_XCR0_VALUE = 7;

   IRTemp rfbm = newTemp(Ity_I64);
   assign(rfbm,
          binop(Iop_And64,
                binop(Iop_Or64,
                      binop(Iop_Shl64,
                            unop(Iop_32Uto64, getIRegRDX(4)), mkU8(32)),
                      unop(Iop_32Uto64, getIRegRAX(4))),
                mkU64(aSSUMED_XCR0_VALUE)));

   gen_XSAVE_SEQUENCE(addr, rfbm);

   /* Finally, we need to update XSTATE_BV in the XSAVE header area, by
      OR-ing the RFBM value into it. */
   IRTemp addr_plus_512 = newTemp(Ity_I64);
   assign(addr_plus_512, binop(Iop_Add64, mkexpr(addr), mkU64(512)));
   storeLE( mkexpr(addr_plus_512),
            binop(Iop_Or8,
                  unop(Iop_64to8, mkexpr(rfbm)),
                  loadLE(Ity_I8, mkexpr(addr_plus_512))) );

   return delta;
}


static Long dis_FXSAVE ( const VexAbiInfo* vbi,
                         Prefix pfx, Long delta, Int sz )
{
   /* See comment in dis_XSAVE about the significance of REX.W. */
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   vassert(!epartIsReg(modrm)); /* ensured by caller */
   vassert(sz == 4 || sz == 8); /* ditto */

   addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
   delta += alen;
   gen_SEGV_if_not_16_aligned(addr);

   DIP("%sfxsave %s\n", sz==8 ? "rex64/" : "", dis_buf);

   /* FXSAVE is just XSAVE with components 0 and 1 selected.  Set rfbm
      to 0b011, generate the XSAVE sequence accordingly, and let iropt
      fold out the unused (AVX) parts accordingly. */
   IRTemp rfbm = newTemp(Ity_I64);
   assign(rfbm, mkU64(3));
   gen_XSAVE_SEQUENCE(addr, rfbm);

   return delta;
}


static void gen_XRSTOR_SEQUENCE ( IRTemp addr, IRTemp xstate_bv, IRTemp rfbm )
{
   /* ------ rfbm[0] gates the x87 state ------ */

   /* If rfbm[0] == 1, we have to write the x87 state.  If
      xstate_bv[0] == 1, we will read it from the memory image, else
      we'll set it to initial values.  Doing this with a helper
      function and getting the definedness flow annotations correct is
      too difficult, so generate stupid but simple code: first set the
      registers to initial values, regardless of xstate_bv[0].  Then,
      conditionally restore from the memory image. */

   IRTemp rfbm_0       = newTemp(Ity_I64);
   IRTemp xstate_bv_0  = newTemp(Ity_I64);
   IRTemp restore_0    = newTemp(Ity_I64);
   assign(rfbm_0,      binop(Iop_And64, mkexpr(rfbm), mkU64(1)));
   assign(xstate_bv_0, binop(Iop_And64, mkexpr(xstate_bv), mkU64(1)));
   assign(restore_0,   binop(Iop_And64, mkexpr(rfbm_0), mkexpr(xstate_bv_0)));

   gen_FINIT_SEQUENCE( binop(Iop_CmpNE64, mkexpr(rfbm_0), mkU64(0)) );

   /* Uses dirty helper:
         void amd64g_do_XRSTOR_COMPONENT_0 ( VexGuestAMD64State*, ULong )
   */
   IRDirty* d0 = unsafeIRDirty_0_N (
                    0/*regparms*/,
                    "amd64g_dirtyhelper_XRSTOR_COMPONENT_0",
                    &amd64g_dirtyhelper_XRSTOR_COMPONENT_0,
                    mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                 );
   d0->guard = binop(Iop_CmpNE64, mkexpr(restore_0), mkU64(0));

   /* Declare we're reading memory.  Really, bytes 24 through 31
      (MXCSR and MXCSR_MASK) aren't read, but we can't express more
      than 1 memory area here, so just mark the whole thing as
      read. */
   d0->mFx   = Ifx_Read;
   d0->mAddr = mkexpr(addr);
   d0->mSize = 160;

   /* declare we're writing guest state */
   d0->nFxState = 5;
   vex_bzero(&d0->fxState, sizeof(d0->fxState));

   d0->fxState[0].fx     = Ifx_Write;
   d0->fxState[0].offset = OFFB_FTOP;
   d0->fxState[0].size   = sizeof(UInt);

   d0->fxState[1].fx     = Ifx_Write;
   d0->fxState[1].offset = OFFB_FPREGS;
   d0->fxState[1].size   = 8 * sizeof(ULong);

   d0->fxState[2].fx     = Ifx_Write;
   d0->fxState[2].offset = OFFB_FPTAGS;
   d0->fxState[2].size   = 8 * sizeof(UChar);

   d0->fxState[3].fx     = Ifx_Write;
   d0->fxState[3].offset = OFFB_FPROUND;
   d0->fxState[3].size   = sizeof(ULong);

   d0->fxState[4].fx     = Ifx_Write;
   d0->fxState[4].offset = OFFB_FC3210;
   d0->fxState[4].size   = sizeof(ULong);

   stmt( IRStmt_Dirty(d0) );

   /* ------ rfbm[1] gates the SSE state ------ */

   /* Same scheme as component 0: first zero it out, and then possibly
      restore from the memory area. */
   IRTemp rfbm_1       = newTemp(Ity_I64);
   IRTemp xstate_bv_1  = newTemp(Ity_I64);
   IRTemp restore_1    = newTemp(Ity_I64);
   assign(rfbm_1,      binop(Iop_And64, mkexpr(rfbm), mkU64(2)));
   assign(xstate_bv_1, binop(Iop_And64, mkexpr(xstate_bv), mkU64(2)));
   assign(restore_1,   binop(Iop_And64, mkexpr(rfbm_1), mkexpr(xstate_bv_1)));
   IRExpr* rfbm_1e     = binop(Iop_CmpNE64, mkexpr(rfbm_1),    mkU64(0));
   IRExpr* restore_1e  = binop(Iop_CmpNE64, mkexpr(restore_1), mkU64(0));

   IRTemp rfbm_1or2       = newTemp(Ity_I64);
   IRTemp xstate_bv_1or2  = newTemp(Ity_I64);
   IRTemp restore_1or2    = newTemp(Ity_I64);
   assign(rfbm_1or2,      binop(Iop_And64, mkexpr(rfbm), mkU64(6)));
   assign(xstate_bv_1or2, binop(Iop_And64, mkexpr(xstate_bv), mkU64(6)));
   assign(restore_1or2,   binop(Iop_And64, mkexpr(rfbm_1or2),
                                           mkexpr(xstate_bv_1or2)));
   IRExpr* rfbm_1or2e     = binop(Iop_CmpNE64, mkexpr(rfbm_1or2),    mkU64(0));
   IRExpr* restore_1or2e  = binop(Iop_CmpNE64, mkexpr(restore_1or2), mkU64(0));

   /* The areas in question are: SSEROUND, and the XMM register array. */
   putGuarded(OFFB_SSEROUND, rfbm_1or2e, mkU64(Irrm_NEAREST));

   UInt reg;
   for (reg = 0; reg < 16; reg++) {
      putGuarded(xmmGuestRegOffset(reg), rfbm_1e, mkV128(0));
   }

   /* And now possibly restore from MXCSR/MXCSR_MASK */
   /* Uses dirty helper:
         void amd64g_do_XRSTOR_COMPONENT_1_EXCLUDING_XMMREGS
                 ( VexGuestAMD64State*, ULong )
      This restores from only MXCSR and MXCSR_MASK.  We need to do
      this if either components 1 (SSE) or 2 (AVX) are requested.
      Hence the guard condition is a bit more complex.
   */
   IRDirty* d1 = unsafeIRDirty_0_N (
                    0/*regparms*/,
                    "amd64g_dirtyhelper_XRSTOR_COMPONENT_1_EXCLUDING_XMMREGS",
                    &amd64g_dirtyhelper_XRSTOR_COMPONENT_1_EXCLUDING_XMMREGS,
                    mkIRExprVec_2( IRExpr_BBPTR(), mkexpr(addr) )
                ) ;
   d1->guard = restore_1or2e;

   /* Declare we're reading memory: MXCSR and MXCSR_MASK.  Note that
      the code for rbfm[0] just above claims a read of 0 .. 159, so
      this duplicates it.  But at least correctly connects 24 .. 31 to
      the MXCSR guest state representation (SSEROUND field). */
   d1->mFx   = Ifx_Read;
   d1->mAddr = binop(Iop_Add64, mkexpr(addr), mkU64(24));
   d1->mSize = 8;

   /* declare we're writing guest state */
   d1->nFxState = 1;
   vex_bzero(&d1->fxState, sizeof(d1->fxState));

   d1->fxState[0].fx     = Ifx_Write;
   d1->fxState[0].offset = OFFB_SSEROUND;
   d1->fxState[0].size   = sizeof(ULong);

   /* Call the helper.  This creates SSEROUND but nothing
      else.  We do the actual register array, XMM[0..15], separately,
      in order that any undefinedness in the XMM registers is tracked
      separately by Memcheck and is not "infected" by the in-memory
      shadow for the other parts of the image. */
   stmt( IRStmt_Dirty(d1) );

   /* And now the XMMs themselves.  For each register, we PUT either
      its old value, or the value loaded from memory.  One convenient
      way to do that is with a conditional load that has its the
      default value, the old value of the register. */
   for (reg = 0; reg < 16; reg++) {
      IRExpr* ea  = binop(Iop_Add64, mkexpr(addr), mkU64(160 + reg * 16));
      IRExpr* alt = getXMMReg(reg);
      IRTemp  loadedValue = newTemp(Ity_V128);
      stmt( IRStmt_LoadG(Iend_LE,
                         ILGop_IdentV128,
                         loadedValue, ea, alt, restore_1e) );
      putXMMReg(reg, mkexpr(loadedValue));
   }

   /* ------ rfbm[2] gates the AVX state ------ */
   /* Component 2 is just a bunch of register loads, so we'll do it
      inline, just to be simple and to be Memcheck friendly. */

   /* Same scheme as component 0: first zero it out, and then possibly
      restore from the memory area. */
   IRTemp rfbm_2      = newTemp(Ity_I64);
   IRTemp xstate_bv_2 = newTemp(Ity_I64);
   IRTemp restore_2   = newTemp(Ity_I64);
   assign(rfbm_2,      binop(Iop_And64, mkexpr(rfbm), mkU64(4)));
   assign(xstate_bv_2, binop(Iop_And64, mkexpr(xstate_bv), mkU64(4)));
   assign(restore_2,   binop(Iop_And64, mkexpr(rfbm_2), mkexpr(xstate_bv_2)));

   IRExpr* rfbm_2e    = binop(Iop_CmpNE64, mkexpr(rfbm_2),    mkU64(0));
   IRExpr* restore_2e = binop(Iop_CmpNE64, mkexpr(restore_2), mkU64(0));

   for (reg = 0; reg < 16; reg++) {
      putGuarded(ymmGuestRegLane128offset(reg, 1), rfbm_2e, mkV128(0));
   }

   for (reg = 0; reg < 16; reg++) {
      IRExpr* ea  = binop(Iop_Add64, mkexpr(addr), mkU64(576 + reg * 16));
      IRExpr* alt = getYMMRegLane128(reg, 1);
      IRTemp  loadedValue = newTemp(Ity_V128);
      stmt( IRStmt_LoadG(Iend_LE,
                         ILGop_IdentV128,
                         loadedValue, ea, alt, restore_2e) );
      putYMMRegLane128(reg, 1, mkexpr(loadedValue));
   }
}


static Long dis_XRSTOR ( const VexAbiInfo* vbi,
                         Prefix pfx, Long delta, Int sz )
{
   /* As with XRSTOR above we ignore the value of REX.W since we're
      not bothering with the FPU DP and IP fields. */
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   vassert(!epartIsReg(modrm)); /* ensured by caller */
   vassert(sz == 4 || sz == 8); /* ditto */

   addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
   delta += alen;
   gen_SEGV_if_not_64_aligned(addr);

   DIP("%sxrstor %s\n", sz==8 ? "rex64/" : "", dis_buf);

   /* VEX's caller is assumed to have checked this. */
   const ULong aSSUMED_XCR0_VALUE = 7;

   IRTemp rfbm = newTemp(Ity_I64);
   assign(rfbm,
          binop(Iop_And64,
                binop(Iop_Or64,
                      binop(Iop_Shl64,
                            unop(Iop_32Uto64, getIRegRDX(4)), mkU8(32)),
                      unop(Iop_32Uto64, getIRegRAX(4))),
                mkU64(aSSUMED_XCR0_VALUE)));

   IRTemp xstate_bv = newTemp(Ity_I64);
   assign(xstate_bv, loadLE(Ity_I64,
                            binop(Iop_Add64, mkexpr(addr), mkU64(512+0))));

   IRTemp xcomp_bv = newTemp(Ity_I64);
   assign(xcomp_bv, loadLE(Ity_I64,
                           binop(Iop_Add64, mkexpr(addr), mkU64(512+8))));

   IRTemp xsavehdr_23_16 = newTemp(Ity_I64);
   assign( xsavehdr_23_16,
           loadLE(Ity_I64,
                  binop(Iop_Add64, mkexpr(addr), mkU64(512+16))));

   /* We must fault if
      * xcomp_bv[63] == 1, since this simulated CPU does not support
        the compaction extension.
      * xstate_bv sets a bit outside of XCR0 (which we assume to be 7).
      * any of the xsave header bytes 23 .. 8 are nonzero.  This seems to
        imply that xcomp_bv must be zero.
      xcomp_bv is header bytes 15 .. 8 and xstate_bv is header bytes 7 .. 0
   */
   IRTemp fault_if_nonzero = newTemp(Ity_I64);
   assign(fault_if_nonzero,
          binop(Iop_Or64,
                binop(Iop_And64, mkexpr(xstate_bv), mkU64(~aSSUMED_XCR0_VALUE)),
                binop(Iop_Or64, mkexpr(xcomp_bv), mkexpr(xsavehdr_23_16))));
   stmt( IRStmt_Exit(binop(Iop_CmpNE64, mkexpr(fault_if_nonzero), mkU64(0)),
                     Ijk_SigSEGV,
                     IRConst_U64(guest_RIP_curr_instr),
                     OFFB_RIP
   ));

   /* We are guaranteed now that both xstate_bv and rfbm are in the
      range 0 .. 7.  Generate the restore sequence proper. */
   gen_XRSTOR_SEQUENCE(addr, xstate_bv, rfbm);

   return delta;
}


static Long dis_FXRSTOR ( const VexAbiInfo* vbi,
                          Prefix pfx, Long delta, Int sz )
{
   /* As with FXSAVE above we ignore the value of REX.W since we're
      not bothering with the FPU DP and IP fields. */
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   UChar  modrm = getUChar(delta);
   vassert(!epartIsReg(modrm)); /* ensured by caller */
   vassert(sz == 4 || sz == 8); /* ditto */

   addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
   delta += alen;
   gen_SEGV_if_not_16_aligned(addr);

   DIP("%sfxrstor %s\n", sz==8 ? "rex64/" : "", dis_buf);

   /* FXRSTOR is just XRSTOR with components 0 and 1 selected and also
      as if components 0 and 1 are set as present in XSTATE_BV in the
      XSAVE header.  Set both rfbm and xstate_bv to 0b011 therefore,
      generate the XRSTOR sequence accordingly, and let iropt fold out
      the unused (AVX) parts accordingly. */
   IRTemp three = newTemp(Ity_I64);
   assign(three, mkU64(3));
   gen_XRSTOR_SEQUENCE(addr, three/*xstate_bv*/, three/*rfbm*/);

   return delta;
}


static IRTemp math_PINSRW_128 ( IRTemp v128, IRTemp u16, UInt imm8 )
{
   vassert(imm8 >= 0 && imm8 <= 7);

   // Create a V128 value which has the selected word in the
   // specified lane, and zeroes everywhere else.
   IRTemp tmp128    = newTemp(Ity_V128);
   IRTemp halfshift = newTemp(Ity_I64);
   assign(halfshift, binop(Iop_Shl64,
                           unop(Iop_16Uto64, mkexpr(u16)),
                           mkU8(16 * (imm8 & 3))));
   if (imm8 < 4) {
      assign(tmp128, binop(Iop_64HLtoV128, mkU64(0), mkexpr(halfshift)));
   } else {
      assign(tmp128, binop(Iop_64HLtoV128, mkexpr(halfshift), mkU64(0)));
   }

   UShort mask = ~(3 << (imm8 * 2));
   IRTemp res  = newTemp(Ity_V128);
   assign( res, binop(Iop_OrV128,
                      mkexpr(tmp128),
                      binop(Iop_AndV128, mkexpr(v128), mkV128(mask))) );
   return res;
}


static IRTemp math_PSADBW_128 ( IRTemp dV, IRTemp sV )
{
   IRTemp s1, s0, d1, d0;
   s1 = s0 = d1 = d0 = IRTemp_INVALID;

   breakupV128to64s( sV, &s1, &s0 );
   breakupV128to64s( dV, &d1, &d0 );

   IRTemp res = newTemp(Ity_V128);
   assign( res,
           binop(Iop_64HLtoV128,
                 mkIRExprCCall(Ity_I64, 0/*regparms*/,
                               "amd64g_calculate_mmx_psadbw",
                               &amd64g_calculate_mmx_psadbw,
                               mkIRExprVec_2( mkexpr(s1), mkexpr(d1))),
                 mkIRExprCCall(Ity_I64, 0/*regparms*/,
                               "amd64g_calculate_mmx_psadbw",
                               &amd64g_calculate_mmx_psadbw,
                               mkIRExprVec_2( mkexpr(s0), mkexpr(d0)))) );
   return res;
}


static IRTemp math_PSADBW_256 ( IRTemp dV, IRTemp sV )
{
   IRTemp sHi, sLo, dHi, dLo;
   sHi = sLo = dHi = dLo = IRTemp_INVALID;
   breakupV256toV128s( dV, &dHi, &dLo);
   breakupV256toV128s( sV, &sHi, &sLo);
   IRTemp res = newTemp(Ity_V256);
   assign(res, binop(Iop_V128HLtoV256,
                     mkexpr(math_PSADBW_128(dHi, sHi)),
                     mkexpr(math_PSADBW_128(dLo, sLo))));
   return res;
}


static Long dis_MASKMOVDQU ( const VexAbiInfo* vbi, Prefix pfx,
                             Long delta, Bool isAvx )
{
   IRTemp regD    = newTemp(Ity_V128);
   IRTemp mask    = newTemp(Ity_V128);
   IRTemp olddata = newTemp(Ity_V128);
   IRTemp newdata = newTemp(Ity_V128);
   IRTemp addr    = newTemp(Ity_I64);
   UChar  modrm   = getUChar(delta);
   UInt   rG      = gregOfRexRM(pfx,modrm);
   UInt   rE      = eregOfRexRM(pfx,modrm);

   assign( addr, handleAddrOverrides( vbi, pfx, getIReg64(R_RDI) ));
   assign( regD, getXMMReg( rG ));

   /* Unfortunately can't do the obvious thing with SarN8x16
      here since that can't be re-emitted as SSE2 code - no such
      insn. */
   assign( mask,
           binop(Iop_64HLtoV128,
                 binop(Iop_SarN8x8,
                       getXMMRegLane64( eregOfRexRM(pfx,modrm), 1 ),
                       mkU8(7) ),
                 binop(Iop_SarN8x8,
                       getXMMRegLane64( eregOfRexRM(pfx,modrm), 0 ),
                       mkU8(7) ) ));
   assign( olddata, loadLE( Ity_V128, mkexpr(addr) ));
   assign( newdata, binop(Iop_OrV128,
                          binop(Iop_AndV128,
                                mkexpr(regD),
                                mkexpr(mask) ),
                          binop(Iop_AndV128,
                                mkexpr(olddata),
                                unop(Iop_NotV128, mkexpr(mask)))) );
   storeLE( mkexpr(addr), mkexpr(newdata) );

   delta += 1;
   DIP("%smaskmovdqu %s,%s\n", isAvx ? "v" : "",
       nameXMMReg(rE), nameXMMReg(rG) );
   return delta;
}


static Long dis_MOVMSKPS_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx )
{
   UChar modrm = getUChar(delta);
   UInt   rG   = gregOfRexRM(pfx,modrm);
   UInt   rE   = eregOfRexRM(pfx,modrm);
   IRTemp t0   = newTemp(Ity_I32);
   IRTemp t1   = newTemp(Ity_I32);
   IRTemp t2   = newTemp(Ity_I32);
   IRTemp t3   = newTemp(Ity_I32);
   delta += 1;
   assign( t0, binop( Iop_And32,
                      binop(Iop_Shr32, getXMMRegLane32(rE,0), mkU8(31)),
                      mkU32(1) ));
   assign( t1, binop( Iop_And32,
                      binop(Iop_Shr32, getXMMRegLane32(rE,1), mkU8(30)),
                      mkU32(2) ));
   assign( t2, binop( Iop_And32,
                      binop(Iop_Shr32, getXMMRegLane32(rE,2), mkU8(29)),
                      mkU32(4) ));
   assign( t3, binop( Iop_And32,
                      binop(Iop_Shr32, getXMMRegLane32(rE,3), mkU8(28)),
                      mkU32(8) ));
   putIReg32( rG, binop(Iop_Or32,
                        binop(Iop_Or32, mkexpr(t0), mkexpr(t1)),
                        binop(Iop_Or32, mkexpr(t2), mkexpr(t3)) ) );
   DIP("%smovmskps %s,%s\n", isAvx ? "v" : "",
       nameXMMReg(rE), nameIReg32(rG));
   return delta;
}


static Long dis_MOVMSKPS_256 ( const VexAbiInfo* vbi, Prefix pfx, Long delta )
{
   UChar modrm = getUChar(delta);
   UInt   rG   = gregOfRexRM(pfx,modrm);
   UInt   rE   = eregOfRexRM(pfx,modrm);
   IRTemp t0   = newTemp(Ity_I32);
   IRTemp t1   = newTemp(Ity_I32);
   IRTemp t2   = newTemp(Ity_I32);
   IRTemp t3   = newTemp(Ity_I32);
   IRTemp t4   = newTemp(Ity_I32);
   IRTemp t5   = newTemp(Ity_I32);
   IRTemp t6   = newTemp(Ity_I32);
   IRTemp t7   = newTemp(Ity_I32);
   delta += 1;
   assign( t0, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,0), mkU8(31)),
                      mkU32(1) ));
   assign( t1, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,1), mkU8(30)),
                      mkU32(2) ));
   assign( t2, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,2), mkU8(29)),
                      mkU32(4) ));
   assign( t3, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,3), mkU8(28)),
                      mkU32(8) ));
   assign( t4, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,4), mkU8(27)),
                      mkU32(16) ));
   assign( t5, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,5), mkU8(26)),
                      mkU32(32) ));
   assign( t6, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,6), mkU8(25)),
                      mkU32(64) ));
   assign( t7, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,7), mkU8(24)),
                      mkU32(128) ));
   putIReg32( rG, binop(Iop_Or32,
                        binop(Iop_Or32,
                              binop(Iop_Or32, mkexpr(t0), mkexpr(t1)),
                              binop(Iop_Or32, mkexpr(t2), mkexpr(t3)) ),
                        binop(Iop_Or32,
                              binop(Iop_Or32, mkexpr(t4), mkexpr(t5)),
                              binop(Iop_Or32, mkexpr(t6), mkexpr(t7)) ) ) );
   DIP("vmovmskps %s,%s\n", nameYMMReg(rE), nameIReg32(rG));
   return delta;
}


static Long dis_MOVMSKPD_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx )
{
   UChar modrm = getUChar(delta);
   UInt   rG   = gregOfRexRM(pfx,modrm);
   UInt   rE   = eregOfRexRM(pfx,modrm);
   IRTemp t0   = newTemp(Ity_I32);
   IRTemp t1   = newTemp(Ity_I32);
   delta += 1;
   assign( t0, binop( Iop_And32,
                      binop(Iop_Shr32, getXMMRegLane32(rE,1), mkU8(31)),
                      mkU32(1) ));
   assign( t1, binop( Iop_And32,
                      binop(Iop_Shr32, getXMMRegLane32(rE,3), mkU8(30)),
                      mkU32(2) ));
   putIReg32( rG, binop(Iop_Or32, mkexpr(t0), mkexpr(t1) ) );
   DIP("%smovmskpd %s,%s\n", isAvx ? "v" : "",
       nameXMMReg(rE), nameIReg32(rG));
   return delta;
}


static Long dis_MOVMSKPD_256 ( const VexAbiInfo* vbi, Prefix pfx, Long delta )
{
   UChar modrm = getUChar(delta);
   UInt   rG   = gregOfRexRM(pfx,modrm);
   UInt   rE   = eregOfRexRM(pfx,modrm);
   IRTemp t0   = newTemp(Ity_I32);
   IRTemp t1   = newTemp(Ity_I32);
   IRTemp t2   = newTemp(Ity_I32);
   IRTemp t3   = newTemp(Ity_I32);
   delta += 1;
   assign( t0, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,1), mkU8(31)),
                      mkU32(1) ));
   assign( t1, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,3), mkU8(30)),
                      mkU32(2) ));
   assign( t2, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,5), mkU8(29)),
                      mkU32(4) ));
   assign( t3, binop( Iop_And32,
                      binop(Iop_Shr32, getYMMRegLane32(rE,7), mkU8(28)),
                      mkU32(8) ));
   putIReg32( rG, binop(Iop_Or32,
                        binop(Iop_Or32, mkexpr(t0), mkexpr(t1)),
                        binop(Iop_Or32, mkexpr(t2), mkexpr(t3)) ) );
   DIP("vmovmskps %s,%s\n", nameYMMReg(rE), nameIReg32(rG));
   return delta;
}


/* Note, this also handles SSE(1) insns. */
__attribute__((noinline))
static
Long dis_ESC_0F__SSE2 ( Bool* decode_OK,
                        const VexArchInfo* archinfo,
                        const VexAbiInfo* vbi,
                        Prefix pfx, Int sz, Long deltaIN,
                        DisResult* dres )
{
   IRTemp addr  = IRTemp_INVALID;
   IRTemp t0    = IRTemp_INVALID;
   IRTemp t1    = IRTemp_INVALID;
   IRTemp t2    = IRTemp_INVALID;
   IRTemp t3    = IRTemp_INVALID;
   IRTemp t4    = IRTemp_INVALID;
   IRTemp t5    = IRTemp_INVALID;
   IRTemp t6    = IRTemp_INVALID;
   UChar  modrm = 0;
   Int    alen  = 0;
   HChar  dis_buf[50];

   *decode_OK = False;

   Long   delta = deltaIN;
   UChar  opc   = getUChar(delta);
   delta++;
   switch (opc) {

   case 0x10:
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         /* 66 0F 10 = MOVUPD -- move from E (mem or xmm) to G (xmm). */
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( gregOfRexRM(pfx,modrm),
                       getXMMReg( eregOfRexRM(pfx,modrm) ));
            DIP("movupd %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            putXMMReg( gregOfRexRM(pfx,modrm),
                       loadLE(Ity_V128, mkexpr(addr)) );
            DIP("movupd %s,%s\n", dis_buf,
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      /* F2 0F 10 = MOVSD -- move 64 bits from E (mem or lo half xmm) to
         G (lo half xmm).  If E is mem, upper half of G is zeroed out.
         If E is reg, upper half of G is unchanged. */
      if (haveF2no66noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8) ) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMRegLane64( gregOfRexRM(pfx,modrm), 0,
                             getXMMRegLane64( eregOfRexRM(pfx,modrm), 0 ));
            DIP("movsd %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                 nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            putXMMReg( gregOfRexRM(pfx,modrm), mkV128(0) );
            putXMMRegLane64( gregOfRexRM(pfx,modrm), 0,
                             loadLE(Ity_I64, mkexpr(addr)) );
            DIP("movsd %s,%s\n", dis_buf,
                                 nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      /* F3 0F 10 = MOVSS -- move 32 bits from E (mem or lo 1/4 xmm) to G
         (lo 1/4 xmm).  If E is mem, upper 3/4 of G is zeroed out. */
      if (haveF3no66noF2(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMRegLane32( gregOfRexRM(pfx,modrm), 0,
                             getXMMRegLane32( eregOfRexRM(pfx,modrm), 0 ));
            DIP("movss %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                 nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            putXMMReg( gregOfRexRM(pfx,modrm), mkV128(0) );
            putXMMRegLane32( gregOfRexRM(pfx,modrm), 0,
                             loadLE(Ity_I32, mkexpr(addr)) );
            DIP("movss %s,%s\n", dis_buf,
                                 nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      /* 0F 10 = MOVUPS -- move from E (mem or xmm) to G (xmm). */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( gregOfRexRM(pfx,modrm),
                       getXMMReg( eregOfRexRM(pfx,modrm) ));
            DIP("movups %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            putXMMReg( gregOfRexRM(pfx,modrm),
                       loadLE(Ity_V128, mkexpr(addr)) );
            DIP("movups %s,%s\n", dis_buf,
                                     nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      break;

   case 0x11:
      /* F2 0F 11 = MOVSD -- move 64 bits from G (lo half xmm) to E (mem
         or lo half xmm). */
      if (haveF2no66noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMRegLane64( eregOfRexRM(pfx,modrm), 0,
                             getXMMRegLane64( gregOfRexRM(pfx,modrm), 0 ));
            DIP("movsd %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                 nameXMMReg(eregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            storeLE( mkexpr(addr),
                     getXMMRegLane64(gregOfRexRM(pfx,modrm), 0) );
            DIP("movsd %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                 dis_buf);
            delta += alen;
         }
         goto decode_success;
      }
      /* F3 0F 11 = MOVSS -- move 32 bits from G (lo 1/4 xmm) to E (mem
         or lo 1/4 xmm). */
      if (haveF3no66noF2(pfx) && sz == 4) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            /* fall through, we don't yet have a test case */
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            storeLE( mkexpr(addr),
                     getXMMRegLane32(gregOfRexRM(pfx,modrm), 0) );
            DIP("movss %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                 dis_buf);
            delta += alen;
            goto decode_success;
         }
      }
      /* 66 0F 11 = MOVUPD -- move from G (xmm) to E (mem or xmm). */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( eregOfRexRM(pfx,modrm),
                       getXMMReg( gregOfRexRM(pfx,modrm) ) );
            DIP("movupd %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                  nameXMMReg(eregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movupd %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                  dis_buf );
            delta += alen;
         }
         goto decode_success;
      }
      /* 0F 11 = MOVUPS -- move from G (xmm) to E (mem or xmm). */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            /* fall through; awaiting test case */
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movups %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                  dis_buf );
            delta += alen;
            goto decode_success;
         }
      }
      break;

   case 0x12:
      /* 66 0F 12 = MOVLPD -- move from mem to low half of XMM. */
      /* Identical to MOVLPS ? */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            /* fall through; apparently reg-reg is not possible */
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            putXMMRegLane64( gregOfRexRM(pfx,modrm),
                             0/*lower lane*/,
                             loadLE(Ity_I64, mkexpr(addr)) );
            DIP("movlpd %s, %s\n",
                dis_buf, nameXMMReg( gregOfRexRM(pfx,modrm) ));
            goto decode_success;
         }
      }
      /* 0F 12 = MOVLPS -- move from mem to low half of XMM. */
      /* OF 12 = MOVHLPS -- from from hi half to lo half of XMM. */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta += 1;
            putXMMRegLane64( gregOfRexRM(pfx,modrm),
                             0/*lower lane*/,
                             getXMMRegLane64( eregOfRexRM(pfx,modrm), 1 ));
            DIP("movhlps %s, %s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            putXMMRegLane64( gregOfRexRM(pfx,modrm),  0/*lower lane*/,
                             loadLE(Ity_I64, mkexpr(addr)) );
            DIP("movlps %s, %s\n",
                dis_buf, nameXMMReg( gregOfRexRM(pfx,modrm) ));
         }
         goto decode_success;
      }
      break;

   case 0x13:
      /* 0F 13 = MOVLPS -- move from low half of XMM to mem. */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            storeLE( mkexpr(addr),
                     getXMMRegLane64( gregOfRexRM(pfx,modrm),
                                      0/*lower lane*/ ) );
            DIP("movlps %s, %s\n", nameXMMReg( gregOfRexRM(pfx,modrm) ),
                                   dis_buf);
            goto decode_success;
         }
         /* else fall through */
      }
      /* 66 0F 13 = MOVLPD -- move from low half of XMM to mem. */
      /* Identical to MOVLPS ? */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            storeLE( mkexpr(addr),
                     getXMMRegLane64( gregOfRexRM(pfx,modrm),
                                      0/*lower lane*/ ) );
            DIP("movlpd %s, %s\n", nameXMMReg( gregOfRexRM(pfx,modrm) ),
                                   dis_buf);
            goto decode_success;
         }
         /* else fall through */
      }
      break;

   case 0x14:
   case 0x15:
      /* 0F 14 = UNPCKLPS -- unpack and interleave low part F32s */
      /* 0F 15 = UNPCKHPS -- unpack and interleave high part F32s */
      /* These just appear to be special cases of SHUFPS */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         Bool   hi = toBool(opc == 0x15);
         IRTemp sV = newTemp(Ity_V128);
         IRTemp dV = newTemp(Ity_V128);
         modrm = getUChar(delta);
         UInt   rG = gregOfRexRM(pfx,modrm);
         assign( dV, getXMMReg(rG) );
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( sV, getXMMReg(rE) );
            delta += 1;
            DIP("unpck%sps %s,%s\n", hi ? "h" : "l",
                nameXMMReg(rE), nameXMMReg(rG));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
            delta += alen;
            DIP("unpck%sps %s,%s\n", hi ? "h" : "l",
                dis_buf, nameXMMReg(rG));
         }
         IRTemp res = math_UNPCKxPS_128( sV, dV, hi );
         putXMMReg( rG, mkexpr(res) );
         goto decode_success;
      }
      /* 66 0F 15 = UNPCKHPD -- unpack and interleave high part F64s */
      /* 66 0F 14 = UNPCKLPD -- unpack and interleave low part F64s */
      /* These just appear to be special cases of SHUFPS */
      if (have66noF2noF3(pfx)
          && sz == 2 /* could be 8 if rex also present */) {
         Bool   hi = toBool(opc == 0x15);
         IRTemp sV = newTemp(Ity_V128);
         IRTemp dV = newTemp(Ity_V128);
         modrm = getUChar(delta);
         UInt   rG = gregOfRexRM(pfx,modrm);
         assign( dV, getXMMReg(rG) );
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( sV, getXMMReg(rE) );
            delta += 1;
            DIP("unpck%sps %s,%s\n", hi ? "h" : "l",
                nameXMMReg(rE), nameXMMReg(rG));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
            delta += alen;
            DIP("unpck%sps %s,%s\n", hi ? "h" : "l",
                dis_buf, nameXMMReg(rG));
         }
         IRTemp res = math_UNPCKxPD_128( sV, dV, hi );
         putXMMReg( rG, mkexpr(res) );
         goto decode_success;
      }
      break;

   case 0x16:
      /* 66 0F 16 = MOVHPD -- move from mem to high half of XMM. */
      /* These seems identical to MOVHPS.  This instruction encoding is
         completely crazy. */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            /* fall through; apparently reg-reg is not possible */
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            putXMMRegLane64( gregOfRexRM(pfx,modrm), 1/*upper lane*/,
                             loadLE(Ity_I64, mkexpr(addr)) );
            DIP("movhpd %s,%s\n", dis_buf,
                                  nameXMMReg( gregOfRexRM(pfx,modrm) ));
            goto decode_success;
         }
      }
      /* 0F 16 = MOVHPS -- move from mem to high half of XMM. */
      /* 0F 16 = MOVLHPS -- move from lo half to hi half of XMM. */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta += 1;
            putXMMRegLane64( gregOfRexRM(pfx,modrm), 1/*upper lane*/,
                             getXMMRegLane64( eregOfRexRM(pfx,modrm), 0 ) );
            DIP("movhps %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            putXMMRegLane64( gregOfRexRM(pfx,modrm), 1/*upper lane*/,
                             loadLE(Ity_I64, mkexpr(addr)) );
            DIP("movhps %s,%s\n", dis_buf,
                                  nameXMMReg( gregOfRexRM(pfx,modrm) ));
         }
         goto decode_success;
      }
      break;

   case 0x17:
      /* 0F 17 = MOVHPS -- move from high half of XMM to mem. */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            storeLE( mkexpr(addr),
                     getXMMRegLane64( gregOfRexRM(pfx,modrm),
                                      1/*upper lane*/ ) );
            DIP("movhps %s,%s\n", nameXMMReg( gregOfRexRM(pfx,modrm) ),
                                  dis_buf);
            goto decode_success;
         }
         /* else fall through */
      }
      /* 66 0F 17 = MOVHPD -- move from high half of XMM to mem. */
      /* Again, this seems identical to MOVHPS. */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            storeLE( mkexpr(addr),
                     getXMMRegLane64( gregOfRexRM(pfx,modrm),
                                      1/*upper lane*/ ) );
            DIP("movhpd %s,%s\n", nameXMMReg( gregOfRexRM(pfx,modrm) ),
                                  dis_buf);
            goto decode_success;
         }
         /* else fall through */
      }
      break;

   case 0x18:
      /* 0F 18 /0 = PREFETCHNTA -- prefetch into caches, */
      /* 0F 18 /1 = PREFETCH0   -- with various different hints */
      /* 0F 18 /2 = PREFETCH1 */
      /* 0F 18 /3 = PREFETCH2 */
      if (haveNo66noF2noF3(pfx)
          && !epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) >= 0
          && gregLO3ofRM(getUChar(delta)) <= 3) {
         const HChar* hintstr = "??";

         modrm = getUChar(delta);
         vassert(!epartIsReg(modrm));

         addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
         delta += alen;

         switch (gregLO3ofRM(modrm)) {
            case 0: hintstr = "nta"; break;
            case 1: hintstr = "t0"; break;
            case 2: hintstr = "t1"; break;
            case 3: hintstr = "t2"; break;
            default: vassert(0);
         }

         DIP("prefetch%s %s\n", hintstr, dis_buf);
         goto decode_success;
      }
      break;

   case 0x28:
      /* 66 0F 28 = MOVAPD -- move from E (mem or xmm) to G (xmm). */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( gregOfRexRM(pfx,modrm),
                       getXMMReg( eregOfRexRM(pfx,modrm) ));
            DIP("movapd %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            putXMMReg( gregOfRexRM(pfx,modrm),
                       loadLE(Ity_V128, mkexpr(addr)) );
            DIP("movapd %s,%s\n", dis_buf,
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      /* 0F 28 = MOVAPS -- move from E (mem or xmm) to G (xmm). */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( gregOfRexRM(pfx,modrm),
                       getXMMReg( eregOfRexRM(pfx,modrm) ));
            DIP("movaps %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            putXMMReg( gregOfRexRM(pfx,modrm),
                       loadLE(Ity_V128, mkexpr(addr)) );
            DIP("movaps %s,%s\n", dis_buf,
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      break;

   case 0x29:
      /* 0F 29 = MOVAPS -- move from G (xmm) to E (mem or xmm). */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( eregOfRexRM(pfx,modrm),
                       getXMMReg( gregOfRexRM(pfx,modrm) ));
            DIP("movaps %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                  nameXMMReg(eregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movaps %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                  dis_buf );
            delta += alen;
         }
         goto decode_success;
      }
      /* 66 0F 29 = MOVAPD -- move from G (xmm) to E (mem or xmm). */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( eregOfRexRM(pfx,modrm),
                       getXMMReg( gregOfRexRM(pfx,modrm) ) );
            DIP("movapd %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                  nameXMMReg(eregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movapd %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                  dis_buf );
            delta += alen;
         }
         goto decode_success;
      }
      break;

   case 0x2A:
      /* 0F 2A = CVTPI2PS -- convert 2 x I32 in mem/mmx to 2 x F32 in low
         half xmm */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         IRTemp arg64 = newTemp(Ity_I64);
         IRTemp rmode = newTemp(Ity_I32);

         modrm = getUChar(delta);
         do_MMX_preamble();
         if (epartIsReg(modrm)) {
            assign( arg64, getMMXReg(eregLO3ofRM(modrm)) );
            delta += 1;
            DIP("cvtpi2ps %s,%s\n", nameMMXReg(eregLO3ofRM(modrm)),
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( arg64, loadLE(Ity_I64, mkexpr(addr)) );
            delta += alen;
            DIP("cvtpi2ps %s,%s\n", dis_buf,
                                    nameXMMReg(gregOfRexRM(pfx,modrm)) );
         }

         assign( rmode, get_sse_roundingmode() );

         putXMMRegLane32F(
            gregOfRexRM(pfx,modrm), 0,
            binop(Iop_F64toF32,
                  mkexpr(rmode),
                  unop(Iop_I32StoF64,
                       unop(Iop_64to32, mkexpr(arg64)) )) );

         putXMMRegLane32F(
            gregOfRexRM(pfx,modrm), 1,
            binop(Iop_F64toF32,
                  mkexpr(rmode),
                  unop(Iop_I32StoF64,
                       unop(Iop_64HIto32, mkexpr(arg64)) )) );

         goto decode_success;
      }
      /* F3 0F 2A = CVTSI2SS
         -- sz==4: convert I32 in mem/ireg to F32 in low quarter xmm
         -- sz==8: convert I64 in mem/ireg to F32 in low quarter xmm */
      if (haveF3no66noF2(pfx) && (sz == 4 || sz == 8)) {
         IRTemp rmode = newTemp(Ity_I32);
         assign( rmode, get_sse_roundingmode() );
         modrm = getUChar(delta);
         if (sz == 4) {
            IRTemp arg32 = newTemp(Ity_I32);
            if (epartIsReg(modrm)) {
               assign( arg32, getIReg32(eregOfRexRM(pfx,modrm)) );
               delta += 1;
               DIP("cvtsi2ss %s,%s\n", nameIReg32(eregOfRexRM(pfx,modrm)),
                                       nameXMMReg(gregOfRexRM(pfx,modrm)));
            } else {
               addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
               assign( arg32, loadLE(Ity_I32, mkexpr(addr)) );
               delta += alen;
               DIP("cvtsi2ss %s,%s\n", dis_buf,
                                       nameXMMReg(gregOfRexRM(pfx,modrm)) );
            }
            putXMMRegLane32F(
               gregOfRexRM(pfx,modrm), 0,
               binop(Iop_F64toF32,
                     mkexpr(rmode),
                     unop(Iop_I32StoF64, mkexpr(arg32)) ) );
         } else {
            /* sz == 8 */
            IRTemp arg64 = newTemp(Ity_I64);
            if (epartIsReg(modrm)) {
               assign( arg64, getIReg64(eregOfRexRM(pfx,modrm)) );
               delta += 1;
               DIP("cvtsi2ssq %s,%s\n", nameIReg64(eregOfRexRM(pfx,modrm)),
                                        nameXMMReg(gregOfRexRM(pfx,modrm)));
            } else {
               addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
               assign( arg64, loadLE(Ity_I64, mkexpr(addr)) );
               delta += alen;
               DIP("cvtsi2ssq %s,%s\n", dis_buf,
                                        nameXMMReg(gregOfRexRM(pfx,modrm)) );
            }
            putXMMRegLane32F(
               gregOfRexRM(pfx,modrm), 0,
               binop(Iop_F64toF32,
                     mkexpr(rmode),
                     binop(Iop_I64StoF64, mkexpr(rmode), mkexpr(arg64)) ) );
         }
         goto decode_success;
      }
      /* F2 0F 2A = CVTSI2SD
         when sz==4 -- convert I32 in mem/ireg to F64 in low half xmm
         when sz==8 -- convert I64 in mem/ireg to F64 in low half xmm
      */
      if (haveF2no66noF3(pfx) && (sz == 4 || sz == 8)) {
         modrm = getUChar(delta);
         if (sz == 4) {
            IRTemp arg32 = newTemp(Ity_I32);
            if (epartIsReg(modrm)) {
               assign( arg32, getIReg32(eregOfRexRM(pfx,modrm)) );
               delta += 1;
               DIP("cvtsi2sdl %s,%s\n", nameIReg32(eregOfRexRM(pfx,modrm)),
                                        nameXMMReg(gregOfRexRM(pfx,modrm)));
            } else {
               addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
               assign( arg32, loadLE(Ity_I32, mkexpr(addr)) );
               delta += alen;
               DIP("cvtsi2sdl %s,%s\n", dis_buf,
                                        nameXMMReg(gregOfRexRM(pfx,modrm)) );
            }
            putXMMRegLane64F( gregOfRexRM(pfx,modrm), 0,
                              unop(Iop_I32StoF64, mkexpr(arg32))
            );
         } else {
            /* sz == 8 */
            IRTemp arg64 = newTemp(Ity_I64);
            if (epartIsReg(modrm)) {
               assign( arg64, getIReg64(eregOfRexRM(pfx,modrm)) );
               delta += 1;
               DIP("cvtsi2sdq %s,%s\n", nameIReg64(eregOfRexRM(pfx,modrm)),
                                        nameXMMReg(gregOfRexRM(pfx,modrm)));
            } else {
               addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
               assign( arg64, loadLE(Ity_I64, mkexpr(addr)) );
               delta += alen;
               DIP("cvtsi2sdq %s,%s\n", dis_buf,
                                        nameXMMReg(gregOfRexRM(pfx,modrm)) );
            }
            putXMMRegLane64F(
               gregOfRexRM(pfx,modrm),
               0,
               binop( Iop_I64StoF64,
                      get_sse_roundingmode(),
                      mkexpr(arg64)
               )
            );
         }
         goto decode_success;
      }
      /* 66 0F 2A = CVTPI2PD -- convert 2 x I32 in mem/mmx to 2 x F64 in
         xmm(G) */
      if (have66noF2noF3(pfx) && sz == 2) {
         IRTemp arg64 = newTemp(Ity_I64);

         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            /* Only switch to MMX mode if the source is a MMX register.
               This is inconsistent with all other instructions which
               convert between XMM and (M64 or MMX), which always switch
               to MMX mode even if 64-bit operand is M64 and not MMX.  At
               least, that's what the Intel docs seem to me to say.
               Fixes #210264. */
            do_MMX_preamble();
            assign( arg64, getMMXReg(eregLO3ofRM(modrm)) );
            delta += 1;
            DIP("cvtpi2pd %s,%s\n", nameMMXReg(eregLO3ofRM(modrm)),
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( arg64, loadLE(Ity_I64, mkexpr(addr)) );
            delta += alen;
            DIP("cvtpi2pd %s,%s\n", dis_buf,
                                    nameXMMReg(gregOfRexRM(pfx,modrm)) );
         }

         putXMMRegLane64F(
            gregOfRexRM(pfx,modrm), 0,
            unop(Iop_I32StoF64, unop(Iop_64to32, mkexpr(arg64)) )
         );

         putXMMRegLane64F(
            gregOfRexRM(pfx,modrm), 1,
            unop(Iop_I32StoF64, unop(Iop_64HIto32, mkexpr(arg64)) )
         );

         goto decode_success;
      }
      break;

   case 0x2B:
      /* 66 0F 2B = MOVNTPD -- for us, just a plain SSE store. */
      /* 0F 2B = MOVNTPS -- for us, just a plain SSE store. */
      if ( (haveNo66noF2noF3(pfx) && sz == 4)
           || (have66noF2noF3(pfx) && sz == 2) ) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movntp%s %s,%s\n", sz==2 ? "d" : "s",
                                    dis_buf,
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
            goto decode_success;
         }
         /* else fall through */
      }
      break;

   case 0x2C:
   case 0x2D:
      /* 0F 2D = CVTPS2PI -- convert 2 x F32 in mem/low half xmm to 2 x
         I32 in mmx, according to prevailing SSE rounding mode */
      /* 0F 2C = CVTTPS2PI -- convert 2 x F32 in mem/low half xmm to 2 x
         I32 in mmx, rounding towards zero */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         IRTemp dst64  = newTemp(Ity_I64);
         IRTemp rmode  = newTemp(Ity_I32);
         IRTemp f32lo  = newTemp(Ity_F32);
         IRTemp f32hi  = newTemp(Ity_F32);
         Bool   r2zero = toBool(opc == 0x2C);

         do_MMX_preamble();
         modrm = getUChar(delta);

         if (epartIsReg(modrm)) {
            delta += 1;
            assign(f32lo, getXMMRegLane32F(eregOfRexRM(pfx,modrm), 0));
            assign(f32hi, getXMMRegLane32F(eregOfRexRM(pfx,modrm), 1));
            DIP("cvt%sps2pi %s,%s\n", r2zero ? "t" : "",
                                      nameXMMReg(eregOfRexRM(pfx,modrm)),
                                      nameMMXReg(gregLO3ofRM(modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign(f32lo, loadLE(Ity_F32, mkexpr(addr)));
            assign(f32hi, loadLE(Ity_F32, binop( Iop_Add64,
                                                 mkexpr(addr),
                                                 mkU64(4) )));
            delta += alen;
            DIP("cvt%sps2pi %s,%s\n", r2zero ? "t" : "",
                                      dis_buf,
                                      nameMMXReg(gregLO3ofRM(modrm)));
         }

         if (r2zero) {
            assign(rmode, mkU32((UInt)Irrm_ZERO) );
         } else {
            assign( rmode, get_sse_roundingmode() );
         }

         assign(
            dst64,
            binop( Iop_32HLto64,
                   binop( Iop_F64toI32S,
                          mkexpr(rmode),
                          unop( Iop_F32toF64, mkexpr(f32hi) ) ),
                   binop( Iop_F64toI32S,
                          mkexpr(rmode),
                          unop( Iop_F32toF64, mkexpr(f32lo) ) )
                 )
         );

         putMMXReg(gregLO3ofRM(modrm), mkexpr(dst64));
         goto decode_success;
      }
      /* F3 0F 2D = CVTSS2SI
         when sz==4 -- convert F32 in mem/low quarter xmm to I32 in ireg,
                       according to prevailing SSE rounding mode
         when sz==8 -- convert F32 in mem/low quarter xmm to I64 in ireg,
                       according to prevailing SSE rounding mode
      */
      /* F3 0F 2C = CVTTSS2SI
         when sz==4 -- convert F32 in mem/low quarter xmm to I32 in ireg,
                       truncating towards zero
         when sz==8 -- convert F32 in mem/low quarter xmm to I64 in ireg,
                       truncating towards zero
      */
      if (haveF3no66noF2(pfx) && (sz == 4 || sz == 8)) {
         delta = dis_CVTxSS2SI( vbi, pfx, delta, False/*!isAvx*/, opc, sz);
         goto decode_success;
      }
      /* F2 0F 2D = CVTSD2SI
         when sz==4 -- convert F64 in mem/low half xmm to I32 in ireg,
                       according to prevailing SSE rounding mode
         when sz==8 -- convert F64 in mem/low half xmm to I64 in ireg,
                       according to prevailing SSE rounding mode
      */
      /* F2 0F 2C = CVTTSD2SI
         when sz==4 -- convert F64 in mem/low half xmm to I32 in ireg,
                       truncating towards zero
         when sz==8 -- convert F64 in mem/low half xmm to I64 in ireg,
                       truncating towards zero
      */
      if (haveF2no66noF3(pfx) && (sz == 4 || sz == 8)) {
         delta = dis_CVTxSD2SI( vbi, pfx, delta, False/*!isAvx*/, opc, sz);
         goto decode_success;
      }
      /* 66 0F 2D = CVTPD2PI -- convert 2 x F64 in mem/xmm to 2 x
         I32 in mmx, according to prevailing SSE rounding mode */
      /* 66 0F 2C = CVTTPD2PI -- convert 2 x F64 in mem/xmm to 2 x
         I32 in mmx, rounding towards zero */
      if (have66noF2noF3(pfx) && sz == 2) {
         IRTemp dst64  = newTemp(Ity_I64);
         IRTemp rmode  = newTemp(Ity_I32);
         IRTemp f64lo  = newTemp(Ity_F64);
         IRTemp f64hi  = newTemp(Ity_F64);
         Bool   r2zero = toBool(opc == 0x2C);

         do_MMX_preamble();
         modrm = getUChar(delta);

         if (epartIsReg(modrm)) {
            delta += 1;
            assign(f64lo, getXMMRegLane64F(eregOfRexRM(pfx,modrm), 0));
            assign(f64hi, getXMMRegLane64F(eregOfRexRM(pfx,modrm), 1));
            DIP("cvt%spd2pi %s,%s\n", r2zero ? "t" : "",
                                      nameXMMReg(eregOfRexRM(pfx,modrm)),
                                      nameMMXReg(gregLO3ofRM(modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign(f64lo, loadLE(Ity_F64, mkexpr(addr)));
            assign(f64hi, loadLE(Ity_F64, binop( Iop_Add64,
                                                 mkexpr(addr),
                                                 mkU64(8) )));
            delta += alen;
            DIP("cvt%spf2pi %s,%s\n", r2zero ? "t" : "",
                                      dis_buf,
                                      nameMMXReg(gregLO3ofRM(modrm)));
         }

         if (r2zero) {
            assign(rmode, mkU32((UInt)Irrm_ZERO) );
         } else {
            assign( rmode, get_sse_roundingmode() );
         }

         assign(
            dst64,
            binop( Iop_32HLto64,
                   binop( Iop_F64toI32S, mkexpr(rmode), mkexpr(f64hi) ),
                   binop( Iop_F64toI32S, mkexpr(rmode), mkexpr(f64lo) )
                 )
         );

         putMMXReg(gregLO3ofRM(modrm), mkexpr(dst64));
         goto decode_success;
      }
      break;

   case 0x2E:
   case 0x2F:
      /* 66 0F 2E = UCOMISD -- 64F0x2 comparison G,E, and set ZCP */
      /* 66 0F 2F = COMISD  -- 64F0x2 comparison G,E, and set ZCP */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_COMISD( vbi, pfx, delta, False/*!isAvx*/, opc );
         goto decode_success;
      }
      /* 0F 2E = UCOMISS -- 32F0x4 comparison G,E, and set ZCP */
      /* 0F 2F = COMISS  -- 32F0x4 comparison G,E, and set ZCP */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_COMISS( vbi, pfx, delta, False/*!isAvx*/, opc );
         goto decode_success;
      }
      break;

   case 0x50:
      /* 0F 50 = MOVMSKPS - move 4 sign bits from 4 x F32 in xmm(E)
         to 4 lowest bits of ireg(G) */
      if (haveNo66noF2noF3(pfx) && (sz == 4 || sz == 8)
          && epartIsReg(getUChar(delta))) {
         /* sz == 8 is a kludge to handle insns with REX.W redundantly
            set to 1, which has been known to happen:

            4c 0f 50 d9             rex64X movmskps %xmm1,%r11d

            20071106: Intel docs say that REX.W isn't redundant: when
            present, a 64-bit register is written; when not present, only
            the 32-bit half is written.  However, testing on a Core2
            machine suggests the entire 64 bit register is written
            irrespective of the status of REX.W.  That could be because
            of the default rule that says "if the lower half of a 32-bit
            register is written, the upper half is zeroed".  By using
            putIReg32 here we inadvertantly produce the same behaviour as
            the Core2, for the same reason -- putIReg32 implements said
            rule.

            AMD docs give no indication that REX.W is even valid for this
            insn. */
         delta = dis_MOVMSKPS_128( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      /* 66 0F 50 = MOVMSKPD - move 2 sign bits from 2 x F64 in xmm(E) to
         2 lowest bits of ireg(G) */
      if (have66noF2noF3(pfx) && (sz == 2 || sz == 8)) {
         /* sz == 8 is a kludge to handle insns with REX.W redundantly
            set to 1, which has been known to happen:
            66 4c 0f 50 d9          rex64X movmskpd %xmm1,%r11d
            20071106: see further comments on MOVMSKPS implementation above.
         */
         delta = dis_MOVMSKPD_128( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      break;

   case 0x51:
      /* F3 0F 51 = SQRTSS -- approx sqrt 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_unary_lo32( vbi, pfx, delta,
                                            "sqrtss", Iop_Sqrt32F0x4 );
         goto decode_success;
      }
      /* 0F 51 = SQRTPS -- approx sqrt 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_unary_all( vbi, pfx, delta,
                                           "sqrtps", Iop_Sqrt32Fx4 );
         goto decode_success;
      }
      /* F2 0F 51 = SQRTSD -- approx sqrt 64F0x2 from R/M to R */
      if (haveF2no66noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_unary_lo64( vbi, pfx, delta,
                                            "sqrtsd", Iop_Sqrt64F0x2 );
         goto decode_success;
      }
      /* 66 0F 51 = SQRTPD -- approx sqrt 64Fx2 from R/M to R */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_unary_all( vbi, pfx, delta,
                                           "sqrtpd", Iop_Sqrt64Fx2 );
         goto decode_success;
      }
      break;

   case 0x52:
      /* F3 0F 52 = RSQRTSS -- approx reciprocal sqrt 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_unary_lo32( vbi, pfx, delta,
                                            "rsqrtss", Iop_RSqrtEst32F0x4 );
         goto decode_success;
      }
      /* 0F 52 = RSQRTPS -- approx reciprocal sqrt 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_unary_all( vbi, pfx, delta,
                                           "rsqrtps", Iop_RSqrtEst32Fx4 );
         goto decode_success;
      }
      break;

   case 0x53:
      /* F3 0F 53 = RCPSS -- approx reciprocal 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_unary_lo32( vbi, pfx, delta,
                                            "rcpss", Iop_RecipEst32F0x4 );
         goto decode_success;
      }
      /* 0F 53 = RCPPS -- approx reciprocal 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_unary_all( vbi, pfx, delta,
                                           "rcpps", Iop_RecipEst32Fx4 );
         goto decode_success;
      }
      break;

   case 0x54:
      /* 0F 54 = ANDPS -- G = G and E */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "andps", Iop_AndV128 );
         goto decode_success;
      }
      /* 66 0F 54 = ANDPD -- G = G and E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "andpd", Iop_AndV128 );
         goto decode_success;
      }
      break;

   case 0x55:
      /* 0F 55 = ANDNPS -- G = (not G) and E */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all_invG( vbi, pfx, delta, "andnps",
                                                           Iop_AndV128 );
         goto decode_success;
      }
      /* 66 0F 55 = ANDNPD -- G = (not G) and E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all_invG( vbi, pfx, delta, "andnpd",
                                                           Iop_AndV128 );
         goto decode_success;
      }
      break;

   case 0x56:
      /* 0F 56 = ORPS -- G = G and E */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "orps", Iop_OrV128 );
         goto decode_success;
      }
      /* 66 0F 56 = ORPD -- G = G and E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "orpd", Iop_OrV128 );
         goto decode_success;
      }
      break;

   case 0x57:
      /* 66 0F 57 = XORPD -- G = G xor E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "xorpd", Iop_XorV128 );
         goto decode_success;
      }
      /* 0F 57 = XORPS -- G = G xor E */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "xorps", Iop_XorV128 );
         goto decode_success;
      }
      break;

   case 0x58:
      /* 0F 58 = ADDPS -- add 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "addps", Iop_Add32Fx4 );
         goto decode_success;
      }
      /* F3 0F 58 = ADDSS -- add 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo32( vbi, pfx, delta, "addss", Iop_Add32F0x4 );
         goto decode_success;
      }
      /* F2 0F 58 = ADDSD -- add 64F0x2 from R/M to R */
      if (haveF2no66noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         delta = dis_SSE_E_to_G_lo64( vbi, pfx, delta, "addsd", Iop_Add64F0x2 );
         goto decode_success;
      }
      /* 66 0F 58 = ADDPD -- add 32Fx4 from R/M to R */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "addpd", Iop_Add64Fx2 );
         goto decode_success;
      }
      break;

   case 0x59:
      /* F2 0F 59 = MULSD -- mul 64F0x2 from R/M to R */
      if (haveF2no66noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         delta = dis_SSE_E_to_G_lo64( vbi, pfx, delta, "mulsd", Iop_Mul64F0x2 );
         goto decode_success;
      }
      /* F3 0F 59 = MULSS -- mul 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo32( vbi, pfx, delta, "mulss", Iop_Mul32F0x4 );
         goto decode_success;
      }
      /* 0F 59 = MULPS -- mul 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "mulps", Iop_Mul32Fx4 );
         goto decode_success;
      }
      /* 66 0F 59 = MULPD -- mul 64Fx2 from R/M to R */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "mulpd", Iop_Mul64Fx2 );
         goto decode_success;
      }
      break;

   case 0x5A:
      /* 0F 5A = CVTPS2PD -- convert 2 x F32 in low half mem/xmm to 2 x
         F64 in xmm(G). */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         delta = dis_CVTPS2PD_128( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      /* F3 0F 5A = CVTSS2SD -- convert F32 in mem/low 1/4 xmm to F64 in
         low half xmm(G) */
      if (haveF3no66noF2(pfx) && sz == 4) {
         IRTemp f32lo = newTemp(Ity_F32);

         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta += 1;
            assign(f32lo, getXMMRegLane32F(eregOfRexRM(pfx,modrm), 0));
            DIP("cvtss2sd %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign(f32lo, loadLE(Ity_F32, mkexpr(addr)));
            delta += alen;
            DIP("cvtss2sd %s,%s\n", dis_buf,
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
         }

         putXMMRegLane64F( gregOfRexRM(pfx,modrm), 0,
                           unop( Iop_F32toF64, mkexpr(f32lo) ) );

         goto decode_success;
      }
      /* F2 0F 5A = CVTSD2SS -- convert F64 in mem/low half xmm to F32 in
         low 1/4 xmm(G), according to prevailing SSE rounding mode */
      if (haveF2no66noF3(pfx) && sz == 4) {
         IRTemp rmode = newTemp(Ity_I32);
         IRTemp f64lo = newTemp(Ity_F64);

         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta += 1;
            assign(f64lo, getXMMRegLane64F(eregOfRexRM(pfx,modrm), 0));
            DIP("cvtsd2ss %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign(f64lo, loadLE(Ity_F64, mkexpr(addr)));
            delta += alen;
            DIP("cvtsd2ss %s,%s\n", dis_buf,
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
         }

         assign( rmode, get_sse_roundingmode() );
         putXMMRegLane32F(
            gregOfRexRM(pfx,modrm), 0,
            binop( Iop_F64toF32, mkexpr(rmode), mkexpr(f64lo) )
         );

         goto decode_success;
      }
      /* 66 0F 5A = CVTPD2PS -- convert 2 x F64 in mem/xmm to 2 x F32 in
         lo half xmm(G), rounding according to prevailing SSE rounding
         mode, and zero upper half */
      /* Note, this is practically identical to CVTPD2DQ.  It would have
         be nice to merge them together. */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_CVTPD2PS_128( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      break;

   case 0x5B:
      /* F3 0F 5B = CVTTPS2DQ -- convert 4 x F32 in mem/xmm to 4 x I32 in
         xmm(G), rounding towards zero */
      /* 66 0F 5B = CVTPS2DQ -- convert 4 x F32 in mem/xmm to 4 x I32 in
         xmm(G), as per the prevailing rounding mode */
      if ( (have66noF2noF3(pfx) && sz == 2)
           || (haveF3no66noF2(pfx) && sz == 4) ) {
         Bool r2zero = toBool(sz == 4); // FIXME -- unreliable (???)
         delta = dis_CVTxPS2DQ_128( vbi, pfx, delta, False/*!isAvx*/, r2zero );
         goto decode_success;
      }
      /* 0F 5B = CVTDQ2PS -- convert 4 x I32 in mem/xmm to 4 x F32 in
         xmm(G) */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_CVTDQ2PS_128( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      break;

   case 0x5C:
      /* F3 0F 5C = SUBSS -- sub 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo32( vbi, pfx, delta, "subss", Iop_Sub32F0x4 );
         goto decode_success;
      }
      /* F2 0F 5C = SUBSD -- sub 64F0x2 from R/M to R */
      if (haveF2no66noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         delta = dis_SSE_E_to_G_lo64( vbi, pfx, delta, "subsd", Iop_Sub64F0x2 );
         goto decode_success;
      }
      /* 0F 5C = SUBPS -- sub 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "subps", Iop_Sub32Fx4 );
         goto decode_success;
      }
      /* 66 0F 5C = SUBPD -- sub 64Fx2 from R/M to R */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "subpd", Iop_Sub64Fx2 );
         goto decode_success;
      }
      break;

   case 0x5D:
      /* 0F 5D = MINPS -- min 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "minps", Iop_Min32Fx4 );
         goto decode_success;
      }
      /* F3 0F 5D = MINSS -- min 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo32( vbi, pfx, delta, "minss", Iop_Min32F0x4 );
         goto decode_success;
      }
      /* F2 0F 5D = MINSD -- min 64F0x2 from R/M to R */
      if (haveF2no66noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo64( vbi, pfx, delta, "minsd", Iop_Min64F0x2 );
         goto decode_success;
      }
      /* 66 0F 5D = MINPD -- min 64Fx2 from R/M to R */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "minpd", Iop_Min64Fx2 );
         goto decode_success;
      }
      break;

   case 0x5E:
      /* F2 0F 5E = DIVSD -- div 64F0x2 from R/M to R */
      if (haveF2no66noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo64( vbi, pfx, delta, "divsd", Iop_Div64F0x2 );
         goto decode_success;
      }
      /* 0F 5E = DIVPS -- div 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "divps", Iop_Div32Fx4 );
         goto decode_success;
      }
      /* F3 0F 5E = DIVSS -- div 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo32( vbi, pfx, delta, "divss", Iop_Div32F0x4 );
         goto decode_success;
      }
      /* 66 0F 5E = DIVPD -- div 64Fx2 from R/M to R */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "divpd", Iop_Div64Fx2 );
         goto decode_success;
      }
      break;

   case 0x5F:
      /* 0F 5F = MAXPS -- max 32Fx4 from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "maxps", Iop_Max32Fx4 );
         goto decode_success;
      }
      /* F3 0F 5F = MAXSS -- max 32F0x4 from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo32( vbi, pfx, delta, "maxss", Iop_Max32F0x4 );
         goto decode_success;
      }
      /* F2 0F 5F = MAXSD -- max 64F0x2 from R/M to R */
      if (haveF2no66noF3(pfx) && sz == 4) {
         delta = dis_SSE_E_to_G_lo64( vbi, pfx, delta, "maxsd", Iop_Max64F0x2 );
         goto decode_success;
      }
      /* 66 0F 5F = MAXPD -- max 64Fx2 from R/M to R */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "maxpd", Iop_Max64Fx2 );
         goto decode_success;
      }
      break;

   case 0x60:
      /* 66 0F 60 = PUNPCKLBW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpcklbw",
                                    Iop_InterleaveLO8x16, True );
         goto decode_success;
      }
      break;

   case 0x61:
      /* 66 0F 61 = PUNPCKLWD */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpcklwd",
                                    Iop_InterleaveLO16x8, True );
         goto decode_success;
      }
      break;

   case 0x62:
      /* 66 0F 62 = PUNPCKLDQ */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpckldq",
                                    Iop_InterleaveLO32x4, True );
         goto decode_success;
      }
      break;

   case 0x63:
      /* 66 0F 63 = PACKSSWB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "packsswb",
                                    Iop_QNarrowBin16Sto8Sx16, True );
         goto decode_success;
      }
      break;

   case 0x64:
      /* 66 0F 64 = PCMPGTB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pcmpgtb", Iop_CmpGT8Sx16, False );
         goto decode_success;
      }
      break;

   case 0x65:
      /* 66 0F 65 = PCMPGTW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pcmpgtw", Iop_CmpGT16Sx8, False );
         goto decode_success;
      }
      break;

   case 0x66:
      /* 66 0F 66 = PCMPGTD */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pcmpgtd", Iop_CmpGT32Sx4, False );
         goto decode_success;
      }
      break;

   case 0x67:
      /* 66 0F 67 = PACKUSWB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "packuswb",
                                    Iop_QNarrowBin16Sto8Ux16, True );
         goto decode_success;
      }
      break;

   case 0x68:
      /* 66 0F 68 = PUNPCKHBW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpckhbw",
                                    Iop_InterleaveHI8x16, True );
         goto decode_success;
      }
      break;

   case 0x69:
      /* 66 0F 69 = PUNPCKHWD */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpckhwd",
                                    Iop_InterleaveHI16x8, True );
         goto decode_success;
      }
      break;

   case 0x6A:
      /* 66 0F 6A = PUNPCKHDQ */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpckhdq",
                                    Iop_InterleaveHI32x4, True );
         goto decode_success;
      }
      break;

   case 0x6B:
      /* 66 0F 6B = PACKSSDW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "packssdw",
                                    Iop_QNarrowBin32Sto16Sx8, True );
         goto decode_success;
      }
      break;

   case 0x6C:
      /* 66 0F 6C = PUNPCKLQDQ */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpcklqdq",
                                    Iop_InterleaveLO64x2, True );
         goto decode_success;
      }
      break;

   case 0x6D:
      /* 66 0F 6D = PUNPCKHQDQ */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "punpckhqdq",
                                    Iop_InterleaveHI64x2, True );
         goto decode_success;
      }
      break;

   case 0x6E:
      /* 66 0F 6E = MOVD from ireg32/m32 to xmm lo 1/4,
                    zeroing high 3/4 of xmm. */
      /*              or from ireg64/m64 to xmm lo 1/2,
                    zeroing high 1/2 of xmm. */
      if (have66noF2noF3(pfx)) {
         vassert(sz == 2 || sz == 8);
         if (sz == 2) sz = 4;
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta += 1;
            if (sz == 4) {
               putXMMReg(
                  gregOfRexRM(pfx,modrm),
                  unop( Iop_32UtoV128, getIReg32(eregOfRexRM(pfx,modrm)) )
               );
               DIP("movd %s, %s\n", nameIReg32(eregOfRexRM(pfx,modrm)),
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
            } else {
               putXMMReg(
                  gregOfRexRM(pfx,modrm),
                  unop( Iop_64UtoV128, getIReg64(eregOfRexRM(pfx,modrm)) )
               );
               DIP("movq %s, %s\n", nameIReg64(eregOfRexRM(pfx,modrm)),
                                    nameXMMReg(gregOfRexRM(pfx,modrm)));
            }
         } else {
            addr = disAMode( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            putXMMReg(
               gregOfRexRM(pfx,modrm),
               sz == 4
                  ?  unop( Iop_32UtoV128,loadLE(Ity_I32, mkexpr(addr)) )
                  :  unop( Iop_64UtoV128,loadLE(Ity_I64, mkexpr(addr)) )
            );
            DIP("mov%c %s, %s\n", sz == 4 ? 'd' : 'q', dis_buf,
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
         }
         goto decode_success;
      }
      break;

   case 0x6F:
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         /* 66 0F 6F = MOVDQA -- move from E (mem or xmm) to G (xmm). */
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( gregOfRexRM(pfx,modrm),
                       getXMMReg( eregOfRexRM(pfx,modrm) ));
            DIP("movdqa %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            putXMMReg( gregOfRexRM(pfx,modrm),
                       loadLE(Ity_V128, mkexpr(addr)) );
            DIP("movdqa %s,%s\n", dis_buf,
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      if (haveF3no66noF2(pfx) && sz == 4) {
         /* F3 0F 6F = MOVDQU -- move from E (mem or xmm) to G (xmm). */
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMReg( gregOfRexRM(pfx,modrm),
                       getXMMReg( eregOfRexRM(pfx,modrm) ));
            DIP("movdqu %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            putXMMReg( gregOfRexRM(pfx,modrm),
                       loadLE(Ity_V128, mkexpr(addr)) );
            DIP("movdqu %s,%s\n", dis_buf,
                                  nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      break;

   case 0x70:
      /* 66 0F 70 = PSHUFD -- rearrange 4x32 from E(xmm or mem) to G(xmm) */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_PSHUFD_32x4( vbi, pfx, delta, False/*!writesYmm*/);
         goto decode_success;
      }
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F 70 = PSHUFW -- rearrange 4x16 from E(mmx or mem) to G(mmx) */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         Int order;
         IRTemp sV, dV, s3, s2, s1, s0;
         s3 = s2 = s1 = s0 = IRTemp_INVALID;
         sV = newTemp(Ity_I64);
         dV = newTemp(Ity_I64);
         do_MMX_preamble();
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            assign( sV, getMMXReg(eregLO3ofRM(modrm)) );
            order = (Int)getUChar(delta+1);
            delta += 1+1;
            DIP("pshufw $%d,%s,%s\n", order,
                                      nameMMXReg(eregLO3ofRM(modrm)),
                                      nameMMXReg(gregLO3ofRM(modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf,
                              1/*extra byte after amode*/ );
            assign( sV, loadLE(Ity_I64, mkexpr(addr)) );
            order = (Int)getUChar(delta+alen);
            delta += 1+alen;
            DIP("pshufw $%d,%s,%s\n", order,
                                      dis_buf,
                                      nameMMXReg(gregLO3ofRM(modrm)));
         }
         breakup64to16s( sV, &s3, &s2, &s1, &s0 );
#        define SEL(n) \
                   ((n)==0 ? s0 : ((n)==1 ? s1 : ((n)==2 ? s2 : s3)))
         assign(dV,
                mk64from16s( SEL((order>>6)&3), SEL((order>>4)&3),
                             SEL((order>>2)&3), SEL((order>>0)&3) )
         );
         putMMXReg(gregLO3ofRM(modrm), mkexpr(dV));
#        undef SEL
         goto decode_success;
      }
      /* F2 0F 70 = PSHUFLW -- rearrange lower half 4x16 from E(xmm or
         mem) to G(xmm), and copy upper half */
      if (haveF2no66noF3(pfx) && sz == 4) {
         delta = dis_PSHUFxW_128( vbi, pfx, delta,
                                  False/*!isAvx*/, False/*!xIsH*/ );
         goto decode_success;
      }
      /* F3 0F 70 = PSHUFHW -- rearrange upper half 4x16 from E(xmm or
         mem) to G(xmm), and copy lower half */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_PSHUFxW_128( vbi, pfx, delta,
                                  False/*!isAvx*/, True/*xIsH*/ );
         goto decode_success;
      }
      break;

   case 0x71:
      /* 66 0F 71 /2 ib = PSRLW by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 2) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "psrlw", Iop_ShrN16x8 );
         goto decode_success;
      }
      /* 66 0F 71 /4 ib = PSRAW by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 4) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "psraw", Iop_SarN16x8 );
         goto decode_success;
      }
      /* 66 0F 71 /6 ib = PSLLW by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 6) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "psllw", Iop_ShlN16x8 );
         goto decode_success;
      }
      break;

   case 0x72:
      /* 66 0F 72 /2 ib = PSRLD by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 2) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "psrld", Iop_ShrN32x4 );
         goto decode_success;
      }
      /* 66 0F 72 /4 ib = PSRAD by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 4) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "psrad", Iop_SarN32x4 );
         goto decode_success;
      }
      /* 66 0F 72 /6 ib = PSLLD by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 6) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "pslld", Iop_ShlN32x4 );
         goto decode_success;
      }
      break;

   case 0x73:
      /* 66 0F 73 /3 ib = PSRLDQ by immediate */
      /* note, if mem case ever filled in, 1 byte after amode */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 3) {
         Int imm = (Int)getUChar(delta+1);
         Int reg = eregOfRexRM(pfx,getUChar(delta));
         DIP("psrldq $%d,%s\n", imm, nameXMMReg(reg));
         delta += 2;
         IRTemp sV = newTemp(Ity_V128);
         assign( sV, getXMMReg(reg) );
         putXMMReg(reg, mkexpr(math_PSRLDQ( sV, imm )));
         goto decode_success;
      }
      /* 66 0F 73 /7 ib = PSLLDQ by immediate */
      /* note, if mem case ever filled in, 1 byte after amode */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 7) {
         Int imm = (Int)getUChar(delta+1);
         Int reg = eregOfRexRM(pfx,getUChar(delta));
         DIP("pslldq $%d,%s\n", imm, nameXMMReg(reg));
         vassert(imm >= 0 && imm <= 255);
         delta += 2;
         IRTemp sV = newTemp(Ity_V128);
         assign( sV, getXMMReg(reg) );
         putXMMReg(reg, mkexpr(math_PSLLDQ( sV, imm )));
         goto decode_success;
      }
      /* 66 0F 73 /2 ib = PSRLQ by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 2) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "psrlq", Iop_ShrN64x2 );
         goto decode_success;
      }
      /* 66 0F 73 /6 ib = PSLLQ by immediate */
      if (have66noF2noF3(pfx) && sz == 2
          && epartIsReg(getUChar(delta))
          && gregLO3ofRM(getUChar(delta)) == 6) {
         delta = dis_SSE_shiftE_imm( pfx, delta, "psllq", Iop_ShlN64x2 );
         goto decode_success;
      }
      break;

   case 0x74:
      /* 66 0F 74 = PCMPEQB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pcmpeqb", Iop_CmpEQ8x16, False );
         goto decode_success;
      }
      break;

   case 0x75:
      /* 66 0F 75 = PCMPEQW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pcmpeqw", Iop_CmpEQ16x8, False );
         goto decode_success;
      }
      break;

   case 0x76:
      /* 66 0F 76 = PCMPEQD */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pcmpeqd", Iop_CmpEQ32x4, False );
         goto decode_success;
      }
      break;

   case 0x7E:
      /* F3 0F 7E = MOVQ -- move 64 bits from E (mem or lo half xmm) to
         G (lo half xmm).  Upper half of G is zeroed out. */
      if (haveF3no66noF2(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            putXMMRegLane64( gregOfRexRM(pfx,modrm), 0,
                             getXMMRegLane64( eregOfRexRM(pfx,modrm), 0 ));
               /* zero bits 127:64 */
               putXMMRegLane64( gregOfRexRM(pfx,modrm), 1, mkU64(0) );
            DIP("movsd %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                 nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            putXMMReg( gregOfRexRM(pfx,modrm), mkV128(0) );
            putXMMRegLane64( gregOfRexRM(pfx,modrm), 0,
                             loadLE(Ity_I64, mkexpr(addr)) );
            DIP("movsd %s,%s\n", dis_buf,
                                 nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
         }
         goto decode_success;
      }
      /* 66 0F 7E = MOVD from xmm low 1/4 to ireg32 or m32. */
      /*              or from xmm low 1/2 to ireg64 or m64. */
         if (have66noF2noF3(pfx) && (sz == 2 || sz == 8)) {
         if (sz == 2) sz = 4;
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta += 1;
            if (sz == 4) {
               putIReg32( eregOfRexRM(pfx,modrm),
                          getXMMRegLane32(gregOfRexRM(pfx,modrm), 0) );
               DIP("movd %s, %s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                    nameIReg32(eregOfRexRM(pfx,modrm)));
            } else {
               putIReg64( eregOfRexRM(pfx,modrm),
                          getXMMRegLane64(gregOfRexRM(pfx,modrm), 0) );
               DIP("movq %s, %s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                    nameIReg64(eregOfRexRM(pfx,modrm)));
            }
         } else {
            addr = disAMode( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            storeLE( mkexpr(addr),
                     sz == 4
                        ? getXMMRegLane32(gregOfRexRM(pfx,modrm),0)
                        : getXMMRegLane64(gregOfRexRM(pfx,modrm),0) );
            DIP("mov%c %s, %s\n", sz == 4 ? 'd' : 'q',
                                  nameXMMReg(gregOfRexRM(pfx,modrm)), dis_buf);
         }
         goto decode_success;
      }
      break;

   case 0x7F:
      /* F3 0F 7F = MOVDQU -- move from G (xmm) to E (mem or xmm). */
      if (haveF3no66noF2(pfx) && sz == 4) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            goto decode_failure; /* awaiting test case */
            delta += 1;
            putXMMReg( eregOfRexRM(pfx,modrm),
                       getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movdqu %s, %s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                   nameXMMReg(eregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode( &alen, vbi, pfx, delta, dis_buf, 0 );
            delta += alen;
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movdqu %s, %s\n", nameXMMReg(gregOfRexRM(pfx,modrm)), dis_buf);
         }
         goto decode_success;
      }
      /* 66 0F 7F = MOVDQA -- move from G (xmm) to E (mem or xmm). */
      if (have66noF2noF3(pfx) && sz == 2) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            delta += 1;
            putXMMReg( eregOfRexRM(pfx,modrm),
                       getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movdqa %s, %s\n", nameXMMReg(gregOfRexRM(pfx,modrm)),
                                   nameXMMReg(eregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            delta += alen;
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movdqa %s, %s\n", nameXMMReg(gregOfRexRM(pfx,modrm)), dis_buf);
         }
         goto decode_success;
      }
      break;

   case 0xAE:
      /* 0F AE /7 = SFENCE -- flush pending operations to memory */
      if (haveNo66noF2noF3(pfx)
          && epartIsReg(getUChar(delta)) && gregLO3ofRM(getUChar(delta)) == 7
          && sz == 4) {
         delta += 1;
         /* Insert a memory fence.  It's sometimes important that these
            are carried through to the generated code. */
         stmt( IRStmt_MBE(Imbe_Fence) );
         DIP("sfence\n");
         goto decode_success;
      }
      /* mindless duplication follows .. */
      /* 0F AE /5 = LFENCE -- flush pending operations to memory */
      /* 0F AE /6 = MFENCE -- flush pending operations to memory */
      if (haveNo66noF2noF3(pfx)
          && epartIsReg(getUChar(delta))
          && (gregLO3ofRM(getUChar(delta)) == 5
              || gregLO3ofRM(getUChar(delta)) == 6)
          && sz == 4) {
         delta += 1;
         /* Insert a memory fence.  It's sometimes important that these
            are carried through to the generated code. */
         stmt( IRStmt_MBE(Imbe_Fence) );
         DIP("%sfence\n", gregLO3ofRM(getUChar(delta-1))==5 ? "l" : "m");
         goto decode_success;
      }

      /* 0F AE /7 = CLFLUSH -- flush cache line */
      if (haveNo66noF2noF3(pfx)
          && !epartIsReg(getUChar(delta)) && gregLO3ofRM(getUChar(delta)) == 7
          && sz == 4) {

         /* This is something of a hack.  We need to know the size of
            the cache line containing addr.  Since we don't (easily),
            assume 256 on the basis that no real cache would have a
            line that big.  It's safe to invalidate more stuff than we
            need, just inefficient. */
         ULong lineszB = 256ULL;

         addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
         delta += alen;

         /* Round addr down to the start of the containing block. */
         stmt( IRStmt_Put(
                  OFFB_CMSTART,
                  binop( Iop_And64,
                         mkexpr(addr),
                         mkU64( ~(lineszB-1) ))) );

         stmt( IRStmt_Put(OFFB_CMLEN, mkU64(lineszB) ) );

         jmp_lit(dres, Ijk_InvalICache, (Addr64)(guest_RIP_bbstart+delta));

         DIP("clflush %s\n", dis_buf);
         goto decode_success;
      }

      /* 0F AE /3 = STMXCSR m32 -- store %mxcsr */
      if (haveNo66noF2noF3(pfx)
          && !epartIsReg(getUChar(delta)) && gregLO3ofRM(getUChar(delta)) == 3
          && sz == 4) {
         delta = dis_STMXCSR(vbi, pfx, delta, False/*!isAvx*/);
         goto decode_success;
      }
      /* 0F AE /2 = LDMXCSR m32 -- load %mxcsr */
      if (haveNo66noF2noF3(pfx)
          && !epartIsReg(getUChar(delta)) && gregLO3ofRM(getUChar(delta)) == 2
          && sz == 4) {
         delta = dis_LDMXCSR(vbi, pfx, delta, False/*!isAvx*/);
         goto decode_success;
      }
      /* 0F AE /0 = FXSAVE m512 -- write x87 and SSE state to memory */
      if (haveNo66noF2noF3(pfx) && (sz == 4 || sz == 8)
          && !epartIsReg(getUChar(delta))
          && gregOfRexRM(pfx,getUChar(delta)) == 0) {
         delta = dis_FXSAVE(vbi, pfx, delta, sz);
         goto decode_success;
      }
      /* 0F AE /1 = FXRSTOR m512 -- read x87 and SSE state from memory */
      if (haveNo66noF2noF3(pfx) && (sz == 4 || sz == 8)
          && !epartIsReg(getUChar(delta))
          && gregOfRexRM(pfx,getUChar(delta)) == 1) {
         delta = dis_FXRSTOR(vbi, pfx, delta, sz);
         goto decode_success;
      }
      /* 0F AE /4 = XSAVE mem -- write x87, SSE, AVX state to memory */
      if (haveNo66noF2noF3(pfx) && (sz == 4 || sz == 8)
          && !epartIsReg(getUChar(delta))
          && gregOfRexRM(pfx,getUChar(delta)) == 4
          && (archinfo->hwcaps & VEX_HWCAPS_AMD64_AVX)) {
         delta = dis_XSAVE(vbi, pfx, delta, sz);
         goto decode_success;
      }
      /* 0F AE /5 = XRSTOR mem -- read x87, SSE, AVX state from memory */
      if (haveNo66noF2noF3(pfx) && (sz == 4 || sz == 8)
          && !epartIsReg(getUChar(delta))
          && gregOfRexRM(pfx,getUChar(delta)) == 5
          && (archinfo->hwcaps & VEX_HWCAPS_AMD64_AVX)) {
         delta = dis_XRSTOR(vbi, pfx, delta, sz);
         goto decode_success;
      }
      break;

   case 0xC2:
      /* 0F C2 = CMPPS -- 32Fx4 comparison from R/M to R */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         Long delta0 = delta;
         delta = dis_SSE_cmp_E_to_G( vbi, pfx, delta, "cmpps", True, 4 );
         if (delta > delta0) goto decode_success;
      }
      /* F3 0F C2 = CMPSS -- 32F0x4 comparison from R/M to R */
      if (haveF3no66noF2(pfx) && sz == 4) {
         Long delta0 = delta;
         delta = dis_SSE_cmp_E_to_G( vbi, pfx, delta, "cmpss", False, 4 );
         if (delta > delta0) goto decode_success;
      }
      /* F2 0F C2 = CMPSD -- 64F0x2 comparison from R/M to R */
      if (haveF2no66noF3(pfx) && sz == 4) {
         Long delta0 = delta;
         delta = dis_SSE_cmp_E_to_G( vbi, pfx, delta, "cmpsd", False, 8 );
         if (delta > delta0) goto decode_success;
      }
      /* 66 0F C2 = CMPPD -- 64Fx2 comparison from R/M to R */
      if (have66noF2noF3(pfx) && sz == 2) {
         Long delta0 = delta;
         delta = dis_SSE_cmp_E_to_G( vbi, pfx, delta, "cmppd", True, 8 );
         if (delta > delta0) goto decode_success;
      }
      break;

   case 0xC3:
      /* 0F C3 = MOVNTI -- for us, just a plain ireg store. */
      if (haveNo66noF2noF3(pfx) && (sz == 4 || sz == 8)) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            storeLE( mkexpr(addr), getIRegG(sz, pfx, modrm) );
            DIP("movnti %s,%s\n", dis_buf,
                                  nameIRegG(sz, pfx, modrm));
            delta += alen;
            goto decode_success;
         }
         /* else fall through */
      }
      break;

   case 0xC4:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F C4 = PINSRW -- get 16 bits from E(mem or low half ireg) and
         put it into the specified lane of mmx(G). */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         /* Use t0 .. t3 to hold the 4 original 16-bit lanes of the
            mmx reg.  t4 is the new lane value.  t5 is the original
            mmx value. t6 is the new mmx value. */
         Int lane;
         t4 = newTemp(Ity_I16);
         t5 = newTemp(Ity_I64);
         t6 = newTemp(Ity_I64);
         modrm = getUChar(delta);
         do_MMX_preamble();

         assign(t5, getMMXReg(gregLO3ofRM(modrm)));
         breakup64to16s( t5, &t3, &t2, &t1, &t0 );

         if (epartIsReg(modrm)) {
            assign(t4, getIReg16(eregOfRexRM(pfx,modrm)));
            delta += 1+1;
            lane = getUChar(delta-1);
            DIP("pinsrw $%d,%s,%s\n", lane,
                                      nameIReg16(eregOfRexRM(pfx,modrm)),
                                      nameMMXReg(gregLO3ofRM(modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 1 );
            delta += 1+alen;
            lane = getUChar(delta-1);
            assign(t4, loadLE(Ity_I16, mkexpr(addr)));
            DIP("pinsrw $%d,%s,%s\n", lane,
                                      dis_buf,
                                      nameMMXReg(gregLO3ofRM(modrm)));
         }

         switch (lane & 3) {
            case 0:  assign(t6, mk64from16s(t3,t2,t1,t4)); break;
            case 1:  assign(t6, mk64from16s(t3,t2,t4,t0)); break;
            case 2:  assign(t6, mk64from16s(t3,t4,t1,t0)); break;
            case 3:  assign(t6, mk64from16s(t4,t2,t1,t0)); break;
            default: vassert(0);
         }
         putMMXReg(gregLO3ofRM(modrm), mkexpr(t6));
         goto decode_success;
      }
      /* 66 0F C4 = PINSRW -- get 16 bits from E(mem or low half ireg) and
         put it into the specified lane of xmm(G). */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         Int lane;
         t4 = newTemp(Ity_I16);
         modrm = getUChar(delta);
         UInt rG = gregOfRexRM(pfx,modrm);
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign(t4, getIReg16(rE));
            delta += 1+1;
            lane = getUChar(delta-1);
            DIP("pinsrw $%d,%s,%s\n",
                lane, nameIReg16(rE), nameXMMReg(rG));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf,
                              1/*byte after the amode*/ );
            delta += 1+alen;
            lane = getUChar(delta-1);
            assign(t4, loadLE(Ity_I16, mkexpr(addr)));
            DIP("pinsrw $%d,%s,%s\n",
                lane, dis_buf, nameXMMReg(rG));
         }
         IRTemp src_vec = newTemp(Ity_V128);
         assign(src_vec, getXMMReg(rG));
         IRTemp res_vec = math_PINSRW_128( src_vec, t4, lane & 7);
         putXMMReg(rG, mkexpr(res_vec));
         goto decode_success;
      }
      break;

   case 0xC5:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F C5 = PEXTRW -- extract 16-bit field from mmx(E) and put
         zero-extend of it in ireg(G). */
      if (haveNo66noF2noF3(pfx) && (sz == 4 || sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            IRTemp sV = newTemp(Ity_I64);
            t5 = newTemp(Ity_I16);
            do_MMX_preamble();
            assign(sV, getMMXReg(eregLO3ofRM(modrm)));
            breakup64to16s( sV, &t3, &t2, &t1, &t0 );
            switch (getUChar(delta+1) & 3) {
               case 0:  assign(t5, mkexpr(t0)); break;
               case 1:  assign(t5, mkexpr(t1)); break;
               case 2:  assign(t5, mkexpr(t2)); break;
               case 3:  assign(t5, mkexpr(t3)); break;
               default: vassert(0);
            }
            if (sz == 8)
               putIReg64(gregOfRexRM(pfx,modrm), unop(Iop_16Uto64, mkexpr(t5)));
            else
               putIReg32(gregOfRexRM(pfx,modrm), unop(Iop_16Uto32, mkexpr(t5)));
            DIP("pextrw $%d,%s,%s\n",
                (Int)getUChar(delta+1),
                nameMMXReg(eregLO3ofRM(modrm)),
                sz==8 ? nameIReg64(gregOfRexRM(pfx,modrm))
                      : nameIReg32(gregOfRexRM(pfx,modrm))
            );
            delta += 2;
            goto decode_success;
         }
         /* else fall through */
         /* note, for anyone filling in the mem case: this insn has one
            byte after the amode and therefore you must pass 1 as the
            last arg to disAMode */
      }
      /* 66 0F C5 = PEXTRW -- extract 16-bit field from xmm(E) and put
         zero-extend of it in ireg(G). */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         Long delta0 = delta;
         delta = dis_PEXTRW_128_EregOnly_toG( vbi, pfx, delta,
                                              False/*!isAvx*/ );
         if (delta > delta0) goto decode_success;
         /* else fall through -- decoding has failed */
      }
      break;

   case 0xC6:
      /* 0F C6 /r ib = SHUFPS -- shuffle packed F32s */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         Int    imm8 = 0;
         IRTemp sV   = newTemp(Ity_V128);
         IRTemp dV   = newTemp(Ity_V128);
         modrm = getUChar(delta);
         UInt rG = gregOfRexRM(pfx,modrm);
         assign( dV, getXMMReg(rG) );
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( sV, getXMMReg(rE) );
            imm8 = (Int)getUChar(delta+1);
            delta += 1+1;
            DIP("shufps $%d,%s,%s\n", imm8, nameXMMReg(rE), nameXMMReg(rG));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 1 );
            assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
            imm8 = (Int)getUChar(delta+alen);
            delta += 1+alen;
            DIP("shufps $%d,%s,%s\n", imm8, dis_buf, nameXMMReg(rG));
         }
         IRTemp res = math_SHUFPS_128( sV, dV, imm8 );
         putXMMReg( gregOfRexRM(pfx,modrm), mkexpr(res) );
         goto decode_success;
      }
      /* 66 0F C6 /r ib = SHUFPD -- shuffle packed F64s */
      if (have66noF2noF3(pfx) && sz == 2) {
         Int    select;
         IRTemp sV = newTemp(Ity_V128);
         IRTemp dV = newTemp(Ity_V128);

         modrm = getUChar(delta);
         assign( dV, getXMMReg(gregOfRexRM(pfx,modrm)) );

         if (epartIsReg(modrm)) {
            assign( sV, getXMMReg(eregOfRexRM(pfx,modrm)) );
            select = (Int)getUChar(delta+1);
            delta += 1+1;
            DIP("shufpd $%d,%s,%s\n", select,
                                      nameXMMReg(eregOfRexRM(pfx,modrm)),
                                      nameXMMReg(gregOfRexRM(pfx,modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 1 );
            assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
            select = getUChar(delta+alen);
            delta += 1+alen;
            DIP("shufpd $%d,%s,%s\n", select,
                                      dis_buf,
                                      nameXMMReg(gregOfRexRM(pfx,modrm)));
         }

         IRTemp res = math_SHUFPD_128( sV, dV, select );
         putXMMReg( gregOfRexRM(pfx,modrm), mkexpr(res) );
         goto decode_success;
      }
      break;

   case 0xD1:
      /* 66 0F D1 = PSRLW by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "psrlw", Iop_ShrN16x8 );
         goto decode_success;
      }
      break;

   case 0xD2:
      /* 66 0F D2 = PSRLD by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "psrld", Iop_ShrN32x4 );
         goto decode_success;
      }
      break;

   case 0xD3:
      /* 66 0F D3 = PSRLQ by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "psrlq", Iop_ShrN64x2 );
         goto decode_success;
      }
      break;

   case 0xD4:
      /* 66 0F D4 = PADDQ */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddq", Iop_Add64x2, False );
         goto decode_success;
      }
      /* ***--- this is an MMX class insn introduced in SSE2 ---*** */
      /* 0F D4 = PADDQ -- add 64x1 */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                   vbi, pfx, delta, opc, "paddq", False );
         goto decode_success;
      }
      break;

   case 0xD5:
      /* 66 0F D5 = PMULLW -- 16x8 multiply */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pmullw", Iop_Mul16x8, False );
         goto decode_success;
      }
      break;

   case 0xD6:
      /* F3 0F D6 = MOVQ2DQ -- move from E (mmx) to G (lo half xmm, zero
         hi half). */
      if (haveF3no66noF2(pfx) && sz == 4) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            do_MMX_preamble();
            putXMMReg( gregOfRexRM(pfx,modrm),
                       unop(Iop_64UtoV128, getMMXReg( eregLO3ofRM(modrm) )) );
            DIP("movq2dq %s,%s\n", nameMMXReg(eregLO3ofRM(modrm)),
                                   nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += 1;
            goto decode_success;
         }
         /* apparently no mem case for this insn */
      }
      /* 66 0F D6 = MOVQ -- move 64 bits from G (lo half xmm) to E (mem
         or lo half xmm).  */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            /* fall through, awaiting test case */
            /* dst: lo half copied, hi half zeroed */
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            storeLE( mkexpr(addr),
                     getXMMRegLane64( gregOfRexRM(pfx,modrm), 0 ));
            DIP("movq %s,%s\n", nameXMMReg(gregOfRexRM(pfx,modrm)), dis_buf );
            delta += alen;
            goto decode_success;
         }
      }
      /* F2 0F D6 = MOVDQ2Q -- move from E (lo half xmm, not mem) to G (mmx). */
      if (haveF2no66noF3(pfx) && sz == 4) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            do_MMX_preamble();
            putMMXReg( gregLO3ofRM(modrm),
                       getXMMRegLane64( eregOfRexRM(pfx,modrm), 0 ));
            DIP("movdq2q %s,%s\n", nameXMMReg(eregOfRexRM(pfx,modrm)),
                                   nameMMXReg(gregLO3ofRM(modrm)));
            delta += 1;
            goto decode_success;
         }
         /* apparently no mem case for this insn */
      }
      break;

   case 0xD7:
      /* 66 0F D7 = PMOVMSKB -- extract sign bits from each of 16
         lanes in xmm(E), turn them into a byte, and put
         zero-extend of it in ireg(G).  Doing this directly is just
         too cumbersome; give up therefore and call a helper. */
      if (have66noF2noF3(pfx)
          && (sz == 2 || /* ignore redundant REX.W */ sz == 8)
          && epartIsReg(getUChar(delta))) { /* no memory case, it seems */
         delta = dis_PMOVMSKB_128( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F D7 = PMOVMSKB -- extract sign bits from each of 8 lanes in
         mmx(E), turn them into a byte, and put zero-extend of it in
         ireg(G). */
      if (haveNo66noF2noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            do_MMX_preamble();
            t0 = newTemp(Ity_I64);
            t1 = newTemp(Ity_I32);
            assign(t0, getMMXReg(eregLO3ofRM(modrm)));
            assign(t1, unop(Iop_8Uto32, unop(Iop_GetMSBs8x8, mkexpr(t0))));
            putIReg32(gregOfRexRM(pfx,modrm), mkexpr(t1));
            DIP("pmovmskb %s,%s\n", nameMMXReg(eregLO3ofRM(modrm)),
                                    nameIReg32(gregOfRexRM(pfx,modrm)));
            delta += 1;
            goto decode_success;
         }
         /* else fall through */
      }
      break;

   case 0xD8:
      /* 66 0F D8 = PSUBUSB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubusb", Iop_QSub8Ux16, False );
         goto decode_success;
      }
      break;

   case 0xD9:
      /* 66 0F D9 = PSUBUSW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubusw", Iop_QSub16Ux8, False );
         goto decode_success;
      }
      break;

   case 0xDA:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F DA = PMINUB -- 8x8 unsigned min */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "pminub", False );
         goto decode_success;
      }
      /* 66 0F DA = PMINUB -- 8x16 unsigned min */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pminub", Iop_Min8Ux16, False );
         goto decode_success;
      }
      break;

   case 0xDB:
      /* 66 0F DB = PAND */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "pand", Iop_AndV128 );
         goto decode_success;
      }
      break;

   case 0xDC:
      /* 66 0F DC = PADDUSB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddusb", Iop_QAdd8Ux16, False );
         goto decode_success;
      }
      break;

   case 0xDD:
      /* 66 0F DD = PADDUSW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddusw", Iop_QAdd16Ux8, False );
         goto decode_success;
      }
      break;

   case 0xDE:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F DE = PMAXUB -- 8x8 unsigned max */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "pmaxub", False );
         goto decode_success;
      }
      /* 66 0F DE = PMAXUB -- 8x16 unsigned max */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pmaxub", Iop_Max8Ux16, False );
         goto decode_success;
      }
      break;

   case 0xDF:
      /* 66 0F DF = PANDN */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all_invG( vbi, pfx, delta, "pandn", Iop_AndV128 );
         goto decode_success;
      }
      break;

   case 0xE0:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F E0 = PAVGB -- 8x8 unsigned Packed Average, with rounding */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "pavgb", False );
         goto decode_success;
      }
      /* 66 0F E0 = PAVGB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pavgb", Iop_Avg8Ux16, False );
         goto decode_success;
      }
      break;

   case 0xE1:
      /* 66 0F E1 = PSRAW by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "psraw", Iop_SarN16x8 );
         goto decode_success;
      }
      break;

   case 0xE2:
      /* 66 0F E2 = PSRAD by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "psrad", Iop_SarN32x4 );
         goto decode_success;
      }
      break;

   case 0xE3:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F E3 = PAVGW -- 16x4 unsigned Packed Average, with rounding */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "pavgw", False );
         goto decode_success;
      }
      /* 66 0F E3 = PAVGW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pavgw", Iop_Avg16Ux8, False );
         goto decode_success;
      }
      break;

   case 0xE4:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F E4 = PMULUH -- 16x4 hi-half of unsigned widening multiply */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "pmuluh", False );
         goto decode_success;
      }
      /* 66 0F E4 = PMULHUW -- 16x8 hi-half of unsigned widening multiply */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pmulhuw", Iop_MulHi16Ux8, False );
         goto decode_success;
      }
      break;

   case 0xE5:
      /* 66 0F E5 = PMULHW -- 16x8 hi-half of signed widening multiply */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pmulhw", Iop_MulHi16Sx8, False );
         goto decode_success;
      }
      break;

   case 0xE6:
      /* 66 0F E6 = CVTTPD2DQ -- convert 2 x F64 in mem/xmm to 2 x I32 in
         lo half xmm(G), and zero upper half, rounding towards zero */
      /* F2 0F E6 = CVTPD2DQ -- convert 2 x F64 in mem/xmm to 2 x I32 in
         lo half xmm(G), according to prevailing rounding mode, and zero
         upper half */
      if ( (haveF2no66noF3(pfx) && sz == 4)
           || (have66noF2noF3(pfx) && sz == 2) ) {
         delta = dis_CVTxPD2DQ_128( vbi, pfx, delta, False/*!isAvx*/,
                                    toBool(sz == 2)/*r2zero*/);
         goto decode_success;
      }
      /* F3 0F E6 = CVTDQ2PD -- convert 2 x I32 in mem/lo half xmm to 2 x
         F64 in xmm(G) */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_CVTDQ2PD_128(vbi, pfx, delta, False/*!isAvx*/);
         goto decode_success;
      }
      break;

   case 0xE7:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F E7 = MOVNTQ -- for us, just a plain MMX store.  Note, the
         Intel manual does not say anything about the usual business of
         the FP reg tags getting trashed whenever an MMX insn happens.
         So we just leave them alone.
      */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            /* do_MMX_preamble(); Intel docs don't specify this */
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            storeLE( mkexpr(addr), getMMXReg(gregLO3ofRM(modrm)) );
            DIP("movntq %s,%s\n", dis_buf,
                                  nameMMXReg(gregLO3ofRM(modrm)));
            delta += alen;
            goto decode_success;
         }
         /* else fall through */
      }
      /* 66 0F E7 = MOVNTDQ -- for us, just a plain SSE store. */
      if (have66noF2noF3(pfx) && sz == 2) {
         modrm = getUChar(delta);
         if (!epartIsReg(modrm)) {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            gen_SEGV_if_not_16_aligned( addr );
            storeLE( mkexpr(addr), getXMMReg(gregOfRexRM(pfx,modrm)) );
            DIP("movntdq %s,%s\n", dis_buf,
                                   nameXMMReg(gregOfRexRM(pfx,modrm)));
            delta += alen;
            goto decode_success;
         }
         /* else fall through */
      }
      break;

   case 0xE8:
      /* 66 0F E8 = PSUBSB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubsb", Iop_QSub8Sx16, False );
         goto decode_success;
      }
      break;

   case 0xE9:
      /* 66 0F E9 = PSUBSW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubsw", Iop_QSub16Sx8, False );
         goto decode_success;
      }
      break;

   case 0xEA:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F EA = PMINSW -- 16x4 signed min */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "pminsw", False );
         goto decode_success;
      }
      /* 66 0F EA = PMINSW -- 16x8 signed min */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pminsw", Iop_Min16Sx8, False );
         goto decode_success;
      }
      break;

   case 0xEB:
      /* 66 0F EB = POR */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "por", Iop_OrV128 );
         goto decode_success;
      }
      break;

   case 0xEC:
      /* 66 0F EC = PADDSB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddsb", Iop_QAdd8Sx16, False );
         goto decode_success;
      }
      break;

   case 0xED:
      /* 66 0F ED = PADDSW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddsw", Iop_QAdd16Sx8, False );
         goto decode_success;
      }
      break;

   case 0xEE:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F EE = PMAXSW -- 16x4 signed max */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "pmaxsw", False );
         goto decode_success;
      }
      /* 66 0F EE = PMAXSW -- 16x8 signed max */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "pmaxsw", Iop_Max16Sx8, False );
         goto decode_success;
      }
      break;

   case 0xEF:
      /* 66 0F EF = PXOR */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_E_to_G_all( vbi, pfx, delta, "pxor", Iop_XorV128 );
         goto decode_success;
      }
      break;

   case 0xF1:
      /* 66 0F F1 = PSLLW by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "psllw", Iop_ShlN16x8 );
         goto decode_success;
      }
      break;

   case 0xF2:
      /* 66 0F F2 = PSLLD by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "pslld", Iop_ShlN32x4 );
         goto decode_success;
      }
      break;

   case 0xF3:
      /* 66 0F F3 = PSLLQ by E */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSE_shiftG_byE( vbi, pfx, delta, "psllq", Iop_ShlN64x2 );
         goto decode_success;
      }
      break;

   case 0xF4:
      /* 66 0F F4 = PMULUDQ -- unsigned widening multiply of 32-lanes 0 x
         0 to form lower 64-bit half and lanes 2 x 2 to form upper 64-bit
         half */
      if (have66noF2noF3(pfx) && sz == 2) {
         IRTemp sV = newTemp(Ity_V128);
         IRTemp dV = newTemp(Ity_V128);
         modrm = getUChar(delta);
         UInt rG = gregOfRexRM(pfx,modrm);
         assign( dV, getXMMReg(rG) );
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( sV, getXMMReg(rE) );
            delta += 1;
            DIP("pmuludq %s,%s\n", nameXMMReg(rE), nameXMMReg(rG));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
            delta += alen;
            DIP("pmuludq %s,%s\n", dis_buf, nameXMMReg(rG));
         }
         putXMMReg( rG, mkexpr(math_PMULUDQ_128( sV, dV )) );
         goto decode_success;
      }
      /* ***--- this is an MMX class insn introduced in SSE2 ---*** */
      /* 0F F4 = PMULUDQ -- unsigned widening multiply of 32-lanes 0 x
         0 to form 64-bit result */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         IRTemp sV = newTemp(Ity_I64);
         IRTemp dV = newTemp(Ity_I64);
         t1 = newTemp(Ity_I32);
         t0 = newTemp(Ity_I32);
         modrm = getUChar(delta);

         do_MMX_preamble();
         assign( dV, getMMXReg(gregLO3ofRM(modrm)) );

         if (epartIsReg(modrm)) {
            assign( sV, getMMXReg(eregLO3ofRM(modrm)) );
            delta += 1;
            DIP("pmuludq %s,%s\n", nameMMXReg(eregLO3ofRM(modrm)),
                                   nameMMXReg(gregLO3ofRM(modrm)));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( sV, loadLE(Ity_I64, mkexpr(addr)) );
            delta += alen;
            DIP("pmuludq %s,%s\n", dis_buf,
                                   nameMMXReg(gregLO3ofRM(modrm)));
         }

         assign( t0, unop(Iop_64to32, mkexpr(dV)) );
         assign( t1, unop(Iop_64to32, mkexpr(sV)) );
         putMMXReg( gregLO3ofRM(modrm),
                    binop( Iop_MullU32, mkexpr(t0), mkexpr(t1) ) );
         goto decode_success;
      }
      break;

   case 0xF5:
      /* 66 0F F5 = PMADDWD -- Multiply and add packed integers from
         E(xmm or mem) to G(xmm) */
      if (have66noF2noF3(pfx) && sz == 2) {
         IRTemp sV = newTemp(Ity_V128);
         IRTemp dV = newTemp(Ity_V128);
         modrm     = getUChar(delta);
         UInt   rG = gregOfRexRM(pfx,modrm);
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( sV, getXMMReg(rE) );
            delta += 1;
            DIP("pmaddwd %s,%s\n", nameXMMReg(rE), nameXMMReg(rG));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
            delta += alen;
            DIP("pmaddwd %s,%s\n", dis_buf, nameXMMReg(rG));
         }
         assign( dV, getXMMReg(rG) );
         putXMMReg( rG, mkexpr(math_PMADDWD_128(dV, sV)) );
         goto decode_success;
      }
      break;

   case 0xF6:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F F6 = PSADBW -- sum of 8Ux8 absolute differences */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                    vbi, pfx, delta, opc, "psadbw", False );
         goto decode_success;
      }
      /* 66 0F F6 = PSADBW -- 2 x (8x8 -> 48 zeroes ++ u16) Sum Abs Diffs
         from E(xmm or mem) to G(xmm) */
      if (have66noF2noF3(pfx) && sz == 2) {
         IRTemp sV  = newTemp(Ity_V128);
         IRTemp dV  = newTemp(Ity_V128);
         modrm = getUChar(delta);
         UInt   rG   = gregOfRexRM(pfx,modrm);
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( sV, getXMMReg(rE) );
            delta += 1;
            DIP("psadbw %s,%s\n", nameXMMReg(rE), nameXMMReg(rG));
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
            delta += alen;
            DIP("psadbw %s,%s\n", dis_buf, nameXMMReg(rG));
         }
         assign( dV, getXMMReg(rG) );
         putXMMReg( rG, mkexpr( math_PSADBW_128 ( dV, sV ) ) );

         goto decode_success;
      }
      break;

   case 0xF7:
      /* ***--- this is an MMX class insn introduced in SSE1 ---*** */
      /* 0F F7 = MASKMOVQ -- 8x8 masked store */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         Bool ok = False;
         delta = dis_MMX( &ok, vbi, pfx, sz, delta-1 );
         if (ok) goto decode_success;
      }
      /* 66 0F F7 = MASKMOVDQU -- store selected bytes of double quadword */
      if (have66noF2noF3(pfx) && sz == 2 && epartIsReg(getUChar(delta))) {
         delta = dis_MASKMOVDQU( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      break;

   case 0xF8:
      /* 66 0F F8 = PSUBB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubb", Iop_Sub8x16, False );
         goto decode_success;
      }
      break;

   case 0xF9:
      /* 66 0F F9 = PSUBW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubw", Iop_Sub16x8, False );
         goto decode_success;
      }
      break;

   case 0xFA:
      /* 66 0F FA = PSUBD */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubd", Iop_Sub32x4, False );
         goto decode_success;
      }
      break;

   case 0xFB:
      /* 66 0F FB = PSUBQ */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "psubq", Iop_Sub64x2, False );
         goto decode_success;
      }
      /* ***--- this is an MMX class insn introduced in SSE2 ---*** */
      /* 0F FB = PSUBQ -- sub 64x1 */
      if (haveNo66noF2noF3(pfx) && sz == 4) {
         do_MMX_preamble();
         delta = dis_MMXop_regmem_to_reg (
                   vbi, pfx, delta, opc, "psubq", False );
         goto decode_success;
      }
      break;

   case 0xFC:
      /* 66 0F FC = PADDB */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddb", Iop_Add8x16, False );
         goto decode_success;
      }
      break;

   case 0xFD:
      /* 66 0F FD = PADDW */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddw", Iop_Add16x8, False );
         goto decode_success;
      }
      break;

   case 0xFE:
      /* 66 0F FE = PADDD */
      if (have66noF2noF3(pfx) && sz == 2) {
         delta = dis_SSEint_E_to_G( vbi, pfx, delta,
                                    "paddd", Iop_Add32x4, False );
         goto decode_success;
      }
      break;

   default:
      goto decode_failure;

   }

  decode_failure:
   *decode_OK = False;
   return deltaIN;

  decode_success:
   *decode_OK = True;
   return delta;
}


/*------------------------------------------------------------*/
/*---                                                      ---*/
/*--- Top-level SSE3 (not SupSSE3): dis_ESC_0F__SSE3       ---*/
/*---                                                      ---*/
/*------------------------------------------------------------*/

static Long dis_MOVDDUP_128 ( const VexAbiInfo* vbi, Prefix pfx,
                              Long delta, Bool isAvx )
{
   IRTemp addr   = IRTemp_INVALID;
   Int    alen   = 0;
   HChar  dis_buf[50];
   IRTemp sV    = newTemp(Ity_V128);
   IRTemp d0    = newTemp(Ity_I64);
   UChar  modrm = getUChar(delta);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( sV, getXMMReg(rE) );
      DIP("%smovddup %s,%s\n",
          isAvx ? "v" : "", nameXMMReg(rE), nameXMMReg(rG));
      delta += 1;
      assign ( d0, unop(Iop_V128to64, mkexpr(sV)) );
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( d0, loadLE(Ity_I64, mkexpr(addr)) );
      DIP("%smovddup %s,%s\n",
          isAvx ? "v" : "", dis_buf, nameXMMReg(rG));
      delta += alen;
   }
   (isAvx ? putYMMRegLoAndZU : putXMMReg)
      ( rG, binop(Iop_64HLtoV128,mkexpr(d0),mkexpr(d0)) );
   return delta;
}


static Long dis_MOVDDUP_256 ( const VexAbiInfo* vbi, Prefix pfx,
                              Long delta )
{
   IRTemp addr   = IRTemp_INVALID;
   Int    alen   = 0;
   HChar  dis_buf[50];
   IRTemp d0    = newTemp(Ity_I64);
   IRTemp d1    = newTemp(Ity_I64);
   UChar  modrm = getUChar(delta);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      DIP("vmovddup %s,%s\n", nameYMMReg(rE), nameYMMReg(rG));
      delta += 1;
      assign ( d0, getYMMRegLane64(rE, 0) );
      assign ( d1, getYMMRegLane64(rE, 2) );
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( d0, loadLE(Ity_I64, mkexpr(addr)) );
      assign( d1, loadLE(Ity_I64, binop(Iop_Add64,
                                        mkexpr(addr), mkU64(16))) );
      DIP("vmovddup %s,%s\n", dis_buf, nameYMMReg(rG));
      delta += alen;
   }
   putYMMRegLane64( rG, 0, mkexpr(d0) );
   putYMMRegLane64( rG, 1, mkexpr(d0) );
   putYMMRegLane64( rG, 2, mkexpr(d1) );
   putYMMRegLane64( rG, 3, mkexpr(d1) );
   return delta;
}


static Long dis_MOVSxDUP_128 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isAvx, Bool isL )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp sV    = newTemp(Ity_V128);
   UChar  modrm = getUChar(delta);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp s3, s2, s1, s0;
   s3 = s2 = s1 = s0 = IRTemp_INVALID;
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( sV, getXMMReg(rE) );
      DIP("%smovs%cdup %s,%s\n",
          isAvx ? "v" : "", isL ? 'l' : 'h', nameXMMReg(rE), nameXMMReg(rG));
      delta += 1;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      if (!isAvx)
         gen_SEGV_if_not_16_aligned( addr );
      assign( sV, loadLE(Ity_V128, mkexpr(addr)) );
      DIP("%smovs%cdup %s,%s\n",
          isAvx ? "v" : "", isL ? 'l' : 'h', dis_buf, nameXMMReg(rG));
      delta += alen;
   }
   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );
   (isAvx ? putYMMRegLoAndZU : putXMMReg)
      ( rG, isL ? mkV128from32s( s2, s2, s0, s0 )
                : mkV128from32s( s3, s3, s1, s1 ) );
   return delta;
}


static Long dis_MOVSxDUP_256 ( const VexAbiInfo* vbi, Prefix pfx,
                               Long delta, Bool isL )
{
   IRTemp addr  = IRTemp_INVALID;
   Int    alen  = 0;
   HChar  dis_buf[50];
   IRTemp sV    = newTemp(Ity_V256);
   UChar  modrm = getUChar(delta);
   UInt   rG    = gregOfRexRM(pfx,modrm);
   IRTemp s7, s6, s5, s4, s3, s2, s1, s0;
   s7 = s6 = s5 = s4 = s3 = s2 = s1 = s0 = IRTemp_INVALID;
   if (epartIsReg(modrm)) {
      UInt rE = eregOfRexRM(pfx,modrm);
      assign( sV, getYMMReg(rE) );
      DIP("vmovs%cdup %s,%s\n",
          isL ? 'l' : 'h', nameYMMReg(rE), nameYMMReg(rG));
      delta += 1;
   } else {
      addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
      assign( sV, loadLE(Ity_V256, mkexpr(addr)) );
      DIP("vmovs%cdup %s,%s\n",
          isL ? 'l' : 'h', dis_buf, nameYMMReg(rG));
      delta += alen;
   }
   breakupV256to32s( sV, &s7, &s6, &s5, &s4, &s3, &s2, &s1, &s0 );
   putYMMRegLane128( rG, 1, isL ? mkV128from32s( s6, s6, s4, s4 )
                                : mkV128from32s( s7, s7, s5, s5 ) );
   putYMMRegLane128( rG, 0, isL ? mkV128from32s( s2, s2, s0, s0 )
                                : mkV128from32s( s3, s3, s1, s1 ) );
   return delta;
}


static IRTemp math_HADDPS_128 ( IRTemp dV, IRTemp sV, Bool isAdd )
{
   IRTemp s3, s2, s1, s0, d3, d2, d1, d0;
   IRTemp leftV  = newTemp(Ity_V128);
   IRTemp rightV = newTemp(Ity_V128);
   IRTemp rm     = newTemp(Ity_I32);
   s3 = s2 = s1 = s0 = d3 = d2 = d1 = d0 = IRTemp_INVALID;

   breakupV128to32s( sV, &s3, &s2, &s1, &s0 );
   breakupV128to32s( dV, &d3, &d2, &d1, &d0 );

   assign( leftV,  mkV128from32s( s2, s0, d2, d0 ) );
   assign( rightV, mkV128from32s( s3, s1, d3, d1 ) );

   IRTemp res = newTemp(Ity_V128);
   assign( rm, get_FAKE_roundingmode() ); /* XXXROUNDINGFIXME */
   assign( res, triop(isAdd ? Iop_Add32Fx4 : Iop_Sub32Fx4,
                      mkexpr(rm), mkexpr(leftV), mkexpr(rightV) ) );
   return res;
}


static IRTemp math_HADDPD_128 ( IRTemp dV, IRTemp sV, Bool isAdd )
{
   IRTemp s1, s0, d1, d0;
   IRTemp leftV  = newTemp(Ity_V128);
   IRTemp rightV = newTemp(Ity_V128);
   IRTemp rm     = newTemp(Ity_I32);
   s1 = s0 = d1 = d0 = IRTemp_INVALID;

   breakupV128to64s( sV, &s1, &s0 );
   breakupV128to64s( dV, &d1, &d0 );

   assign( leftV,  binop(Iop_64HLtoV128, mkexpr(s0), mkexpr(d0)) );
   assign( rightV, binop(Iop_64HLtoV128, mkexpr(s1), mkexpr(d1)) );

   IRTemp res = newTemp(Ity_V128);
   assign( rm, get_FAKE_roundingmode() ); /* XXXROUNDINGFIXME */
   assign( res, triop(isAdd ? Iop_Add64Fx2 : Iop_Sub64Fx2,
                      mkexpr(rm), mkexpr(leftV), mkexpr(rightV) ) );
   return res;
}


__attribute__((noinline))
static
Long dis_ESC_0F__SSE3 ( Bool* decode_OK,
                        const VexAbiInfo* vbi,
                        Prefix pfx, Int sz, Long deltaIN )
{
   IRTemp addr  = IRTemp_INVALID;
   UChar  modrm = 0;
   Int    alen  = 0;
   HChar  dis_buf[50];

   *decode_OK = False;

   Long   delta = deltaIN;
   UChar  opc   = getUChar(delta);
   delta++;
   switch (opc) {

   case 0x12:
      /* F3 0F 12 = MOVSLDUP -- move from E (mem or xmm) to G (xmm),
         duplicating some lanes (2:2:0:0). */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_MOVSxDUP_128( vbi, pfx, delta, False/*!isAvx*/,
                                   True/*isL*/ );
         goto decode_success;
      }
      /* F2 0F 12 = MOVDDUP -- move from E (mem or xmm) to G (xmm),
         duplicating some lanes (0:1:0:1). */
      if (haveF2no66noF3(pfx)
          && (sz == 4 || /* ignore redundant REX.W */ sz == 8)) {
         delta = dis_MOVDDUP_128( vbi, pfx, delta, False/*!isAvx*/ );
         goto decode_success;
      }
      break;

   case 0x16:
      /* F3 0F 16 = MOVSHDUP -- move from E (mem or xmm) to G (xmm),
         duplicating some lanes (3:3:1:1). */
      if (haveF3no66noF2(pfx) && sz == 4) {
         delta = dis_MOVSxDUP_128( vbi, pfx, delta, False/*!isAvx*/,
                                   False/*!isL*/ );
         goto decode_success;
      }
      break;

   case 0x7C:
   case 0x7D:
      /* F2 0F 7C = HADDPS -- 32x4 add across from E (mem or xmm) to G (xmm). */
      /* F2 0F 7D = HSUBPS -- 32x4 sub across from E (mem or xmm) to G (xmm). */
      if (haveF2no66noF3(pfx) && sz == 4) {
         IRTemp eV     = newTemp(Ity_V128);
         IRTemp gV     = newTemp(Ity_V128);
         Bool   isAdd  = opc == 0x7C;
         const HChar* str = isAdd ? "add" : "sub";
         modrm         = getUChar(delta);
         UInt   rG     = gregOfRexRM(pfx,modrm);
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( eV, getXMMReg(rE) );
            DIP("h%sps %s,%s\n", str, nameXMMReg(rE), nameXMMReg(rG));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( eV, loadLE(Ity_V128, mkexpr(addr)) );
            DIP("h%sps %s,%s\n", str, dis_buf, nameXMMReg(rG));
            delta += alen;
         }

         assign( gV, getXMMReg(rG) );
         putXMMReg( rG, mkexpr( math_HADDPS_128 ( gV, eV, isAdd ) ) );
         goto decode_success;
      }
      /* 66 0F 7C = HADDPD -- 64x2 add across from E (mem or xmm) to G (xmm). */
      /* 66 0F 7D = HSUBPD -- 64x2 sub across from E (mem or xmm) to G (xmm). */
      if (have66noF2noF3(pfx) && sz == 2) {
         IRTemp eV     = newTemp(Ity_V128);
         IRTemp gV     = newTemp(Ity_V128);
         Bool   isAdd  = opc == 0x7C;
         const HChar* str = isAdd ? "add" : "sub";
         modrm         = getUChar(delta);
         UInt   rG     = gregOfRexRM(pfx,modrm);
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( eV, getXMMReg(rE) );
            DIP("h%spd %s,%s\n", str, nameXMMReg(rE), nameXMMReg(rG));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( eV, loadLE(Ity_V128, mkexpr(addr)) );
            DIP("h%spd %s,%s\n", str, dis_buf, nameXMMReg(rG));
            delta += alen;
         }

         assign( gV, getXMMReg(rG) );
         putXMMReg( rG, mkexpr( math_HADDPD_128 ( gV, eV, isAdd ) ) );
         goto decode_success;
      }
      break;

   case 0xD0:
      /* 66 0F D0 = ADDSUBPD -- 64x4 +/- from E (mem or xmm) to G (xmm). */
      if (have66noF2noF3(pfx) && sz == 2) {
         IRTemp eV   = newTemp(Ity_V128);
         IRTemp gV   = newTemp(Ity_V128);
         modrm       = getUChar(delta);
         UInt   rG   = gregOfRexRM(pfx,modrm);
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( eV, getXMMReg(rE) );
            DIP("addsubpd %s,%s\n", nameXMMReg(rE), nameXMMReg(rG));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( eV, loadLE(Ity_V128, mkexpr(addr)) );
            DIP("addsubpd %s,%s\n", dis_buf, nameXMMReg(rG));
            delta += alen;
         }

         assign( gV, getXMMReg(rG) );
         putXMMReg( rG, mkexpr( math_ADDSUBPD_128 ( gV, eV ) ) );
         goto decode_success;
      }
      /* F2 0F D0 = ADDSUBPS -- 32x4 +/-/+/- from E (mem or xmm) to G (xmm). */
      if (haveF2no66noF3(pfx) && sz == 4) {
         IRTemp eV   = newTemp(Ity_V128);
         IRTemp gV   = newTemp(Ity_V128);
         modrm       = getUChar(delta);
         UInt   rG   = gregOfRexRM(pfx,modrm);

         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            UInt rE = eregOfRexRM(pfx,modrm);
            assign( eV, getXMMReg(rE) );
            DIP("addsubps %s,%s\n", nameXMMReg(rE), nameXMMReg(rG));
            delta += 1;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            assign( eV, loadLE(Ity_V128, mkexpr(addr)) );
            DIP("addsubps %s,%s\n", dis_buf, nameXMMReg(rG));
            delta += alen;
         }

         assign( gV, getXMMReg(rG) );
         putXMMReg( rG, mkexpr( math_ADDSUBPS_128 ( gV, eV ) ) );
         goto decode_success;
      }
      break;

   case 0xF0:
      /* F2 0F F0 = LDDQU -- move from E (mem or xmm) to G (xmm). */
      if (haveF2no66noF3(pfx) && sz == 4) {
         modrm = getUChar(delta);
         if (epartIsReg(modrm)) {
            goto decode_failure;
         } else {
            addr = disAMode ( &alen, vbi, pfx, delta, dis_buf, 0 );
            putXMMReg( gregOfRexRM(pfx,modrm),
                       loadLE(Ity_V128, mkexpr(addr)) );
            DIP("lddqu %s,%s\n",