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      1 //===- HexagonMCInstrInfo.cpp - Hexagon sub-class of MCInst ---------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This class extends MCInstrInfo to allow Hexagon specific MCInstr queries
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "HexagonMCInstrInfo.h"
     15 #include "HexagonBaseInfo.h"
     16 
     17 namespace llvm {
     18 void HexagonMCInstrInfo::AppendImplicitOperands(MCInst &MCI) {
     19   MCI.addOperand(MCOperand::CreateImm(0));
     20   MCI.addOperand(MCOperand::CreateInst(nullptr));
     21 }
     22 
     23 unsigned HexagonMCInstrInfo::getBitCount(MCInstrInfo const &MCII,
     24                                          MCInst const &MCI) {
     25   uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
     26   return ((F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask);
     27 }
     28 
     29 // Return constant extended operand number.
     30 unsigned short HexagonMCInstrInfo::getCExtOpNum(MCInstrInfo const &MCII,
     31                                                 MCInst const &MCI) {
     32   const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
     33   return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask);
     34 }
     35 
     36 MCInstrDesc const &HexagonMCInstrInfo::getDesc(MCInstrInfo const &MCII,
     37                                                MCInst const &MCI) {
     38   return (MCII.get(MCI.getOpcode()));
     39 }
     40 
     41 std::bitset<16> HexagonMCInstrInfo::GetImplicitBits(MCInst const &MCI) {
     42   SanityCheckImplicitOperands(MCI);
     43   std::bitset<16> Bits(MCI.getOperand(MCI.getNumOperands() - 2).getImm());
     44   return Bits;
     45 }
     46 
     47 // Return the max value that a constant extendable operand can have
     48 // without being extended.
     49 int HexagonMCInstrInfo::getMaxValue(MCInstrInfo const &MCII,
     50                                     MCInst const &MCI) {
     51   uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
     52   unsigned isSigned =
     53       (F >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
     54   unsigned bits = (F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
     55 
     56   if (isSigned) // if value is signed
     57     return ~(-1U << (bits - 1));
     58   else
     59     return ~(-1U << bits);
     60 }
     61 
     62 // Return the min value that a constant extendable operand can have
     63 // without being extended.
     64 int HexagonMCInstrInfo::getMinValue(MCInstrInfo const &MCII,
     65                                     MCInst const &MCI) {
     66   uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
     67   unsigned isSigned =
     68       (F >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
     69   unsigned bits = (F >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
     70 
     71   if (isSigned) // if value is signed
     72     return -1U << (bits - 1);
     73   else
     74     return 0;
     75 }
     76 
     77 // Return the operand that consumes or produces a new value.
     78 MCOperand const &HexagonMCInstrInfo::getNewValue(MCInstrInfo const &MCII,
     79                                                  MCInst const &MCI) {
     80   uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
     81   unsigned const O =
     82       (F >> HexagonII::NewValueOpPos) & HexagonII::NewValueOpMask;
     83   MCOperand const &MCO = MCI.getOperand(O);
     84 
     85   assert((HexagonMCInstrInfo::isNewValue(MCII, MCI) ||
     86           HexagonMCInstrInfo::hasNewValue(MCII, MCI)) &&
     87          MCO.isReg());
     88   return (MCO);
     89 }
     90 
     91 // Return the Hexagon ISA class for the insn.
     92 unsigned HexagonMCInstrInfo::getType(MCInstrInfo const &MCII,
     93                                      MCInst const &MCI) {
     94   const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
     95 
     96   return ((F >> HexagonII::TypePos) & HexagonII::TypeMask);
     97 }
     98 
     99 // Return whether the instruction is a legal new-value producer.
    100 bool HexagonMCInstrInfo::hasNewValue(MCInstrInfo const &MCII,
    101                                      MCInst const &MCI) {
    102   const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
    103   return ((F >> HexagonII::hasNewValuePos) & HexagonII::hasNewValueMask);
    104 }
    105 
    106 // Return whether the insn is an actual insn.
    107 bool HexagonMCInstrInfo::isCanon(MCInstrInfo const &MCII, MCInst const &MCI) {
    108   return (!HexagonMCInstrInfo::getDesc(MCII, MCI).isPseudo() &&
    109           !HexagonMCInstrInfo::isPrefix(MCII, MCI) &&
    110           HexagonMCInstrInfo::getType(MCII, MCI) != HexagonII::TypeENDLOOP);
    111 }
    112 
    113 // Return whether the instruction needs to be constant extended.
    114 // 1) Always return true if the instruction has 'isExtended' flag set.
    115 //
    116 // isExtendable:
    117 // 2) For immediate extended operands, return true only if the value is
    118 //    out-of-range.
    119 // 3) For global address, always return true.
    120 
    121 bool HexagonMCInstrInfo::isConstExtended(MCInstrInfo const &MCII,
    122                                          MCInst const &MCI) {
    123   if (HexagonMCInstrInfo::isExtended(MCII, MCI))
    124     return true;
    125 
    126   if (!HexagonMCInstrInfo::isExtendable(MCII, MCI))
    127     return false;
    128 
    129   short ExtOpNum = HexagonMCInstrInfo::getCExtOpNum(MCII, MCI);
    130   int MinValue = HexagonMCInstrInfo::getMinValue(MCII, MCI);
    131   int MaxValue = HexagonMCInstrInfo::getMaxValue(MCII, MCI);
    132   MCOperand const &MO = MCI.getOperand(ExtOpNum);
    133 
    134   // We could be using an instruction with an extendable immediate and shoehorn
    135   // a global address into it. If it is a global address it will be constant
    136   // extended. We do this for COMBINE.
    137   // We currently only handle isGlobal() because it is the only kind of
    138   // object we are going to end up with here for now.
    139   // In the future we probably should add isSymbol(), etc.
    140   if (MO.isExpr())
    141     return true;
    142 
    143   // If the extendable operand is not 'Immediate' type, the instruction should
    144   // have 'isExtended' flag set.
    145   assert(MO.isImm() && "Extendable operand must be Immediate type");
    146 
    147   int ImmValue = MO.getImm();
    148   return (ImmValue < MinValue || ImmValue > MaxValue);
    149 }
    150 
    151 // Return true if the instruction may be extended based on the operand value.
    152 bool HexagonMCInstrInfo::isExtendable(MCInstrInfo const &MCII,
    153                                       MCInst const &MCI) {
    154   uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
    155   return (F >> HexagonII::ExtendablePos) & HexagonII::ExtendableMask;
    156 }
    157 
    158 // Return whether the instruction must be always extended.
    159 bool HexagonMCInstrInfo::isExtended(MCInstrInfo const &MCII,
    160                                     MCInst const &MCI) {
    161   uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
    162   return (F >> HexagonII::ExtendedPos) & HexagonII::ExtendedMask;
    163 }
    164 
    165 // Return whether the insn is a new-value consumer.
    166 bool HexagonMCInstrInfo::isNewValue(MCInstrInfo const &MCII,
    167                                     MCInst const &MCI) {
    168   const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
    169   return ((F >> HexagonII::NewValuePos) & HexagonII::NewValueMask);
    170 }
    171 
    172 // Return whether the operand can be constant extended.
    173 bool HexagonMCInstrInfo::isOperandExtended(MCInstrInfo const &MCII,
    174                                            MCInst const &MCI,
    175                                            unsigned short OperandNum) {
    176   uint64_t const F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
    177   return ((F >> HexagonII::ExtendableOpPos) & HexagonII::ExtendableOpMask) ==
    178          OperandNum;
    179 }
    180 
    181 bool HexagonMCInstrInfo::isPacketBegin(MCInst const &MCI) {
    182   std::bitset<16> Bits(GetImplicitBits(MCI));
    183   return Bits.test(packetBeginIndex);
    184 }
    185 
    186 bool HexagonMCInstrInfo::isPacketEnd(MCInst const &MCI) {
    187   std::bitset<16> Bits(GetImplicitBits(MCI));
    188   return Bits.test(packetEndIndex);
    189 }
    190 
    191 // Return whether the insn is a prefix.
    192 bool HexagonMCInstrInfo::isPrefix(MCInstrInfo const &MCII, MCInst const &MCI) {
    193   return (HexagonMCInstrInfo::getType(MCII, MCI) == HexagonII::TypePREFIX);
    194 }
    195 
    196 // Return whether the insn is solo, i.e., cannot be in a packet.
    197 bool HexagonMCInstrInfo::isSolo(MCInstrInfo const &MCII, MCInst const &MCI) {
    198   const uint64_t F = HexagonMCInstrInfo::getDesc(MCII, MCI).TSFlags;
    199   return ((F >> HexagonII::SoloPos) & HexagonII::SoloMask);
    200 }
    201 
    202 void HexagonMCInstrInfo::resetPacket(MCInst &MCI) {
    203   setPacketBegin(MCI, false);
    204   setPacketEnd(MCI, false);
    205 }
    206 
    207 void HexagonMCInstrInfo::SetImplicitBits(MCInst &MCI, std::bitset<16> Bits) {
    208   SanityCheckImplicitOperands(MCI);
    209   MCI.getOperand(MCI.getNumOperands() - 2).setImm(Bits.to_ulong());
    210 }
    211 
    212 void HexagonMCInstrInfo::setPacketBegin(MCInst &MCI, bool f) {
    213   std::bitset<16> Bits(GetImplicitBits(MCI));
    214   Bits.set(packetBeginIndex, f);
    215   SetImplicitBits(MCI, Bits);
    216 }
    217 
    218 void HexagonMCInstrInfo::setPacketEnd(MCInst &MCI, bool f) {
    219   std::bitset<16> Bits(GetImplicitBits(MCI));
    220   Bits.set(packetEndIndex, f);
    221   SetImplicitBits(MCI, Bits);
    222 }
    223 }
    224