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      1 //===-- X86ShuffleDecode.h - X86 shuffle decode logic -----------*-C++-*---===//
      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 // Define several functions to decode x86 specific shuffle semantics into a
     11 // generic vector mask.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef LLVM_LIB_TARGET_X86_UTILS_X86SHUFFLEDECODE_H
     16 #define LLVM_LIB_TARGET_X86_UTILS_X86SHUFFLEDECODE_H
     17 
     18 #include "llvm/ADT/SmallVector.h"
     19 #include "llvm/ADT/ArrayRef.h"
     20 
     21 //===----------------------------------------------------------------------===//
     22 //  Vector Mask Decoding
     23 //===----------------------------------------------------------------------===//
     24 
     25 namespace llvm {
     26 class Constant;
     27 class MVT;
     28 
     29 enum { SM_SentinelUndef = -1, SM_SentinelZero = -2 };
     30 
     31 void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     32 
     33 // <3,1> or <6,7,2,3>
     34 void DecodeMOVHLPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask);
     35 
     36 // <0,2> or <0,1,4,5>
     37 void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask);
     38 
     39 void DecodeMOVSLDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask);
     40 
     41 void DecodeMOVSHDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask);
     42 
     43 void DecodeMOVDDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask);
     44 
     45 void DecodePSLLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     46 
     47 void DecodePSRLDQMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     48 
     49 void DecodePALIGNRMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     50 
     51 void DecodePSHUFMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     52 
     53 void DecodePSHUFHWMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     54 
     55 void DecodePSHUFLWMask(MVT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     56 
     57 /// DecodeSHUFPMask - This decodes the shuffle masks for shufp*. VT indicates
     58 /// the type of the vector allowing it to handle different datatypes and vector
     59 /// widths.
     60 void DecodeSHUFPMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     61 
     62 /// DecodeUNPCKHMask - This decodes the shuffle masks for unpckhps/unpckhpd
     63 /// and punpckh*. VT indicates the type of the vector allowing it to handle
     64 /// different datatypes and vector widths.
     65 void DecodeUNPCKHMask(MVT VT, SmallVectorImpl<int> &ShuffleMask);
     66 
     67 /// DecodeUNPCKLMask - This decodes the shuffle masks for unpcklps/unpcklpd
     68 /// and punpckl*. VT indicates the type of the vector allowing it to handle
     69 /// different datatypes and vector widths.
     70 void DecodeUNPCKLMask(MVT VT, SmallVectorImpl<int> &ShuffleMask);
     71 
     72 /// \brief Decode a PSHUFB mask from an IR-level vector constant.
     73 void DecodePSHUFBMask(const Constant *C, SmallVectorImpl<int> &ShuffleMask);
     74 
     75 /// \brief Decode a PSHUFB mask from a raw array of constants such as from
     76 /// BUILD_VECTOR.
     77 void DecodePSHUFBMask(ArrayRef<uint64_t> RawMask,
     78                       SmallVectorImpl<int> &ShuffleMask);
     79 
     80 /// \brief Decode a BLEND immediate mask into a shuffle mask.
     81 void DecodeBLENDMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     82 
     83 void DecodeVPERM2X128Mask(MVT VT, unsigned Imm,
     84                           SmallVectorImpl<int> &ShuffleMask);
     85 
     86 /// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.
     87 /// No VT provided since it only works on 256-bit, 4 element vectors.
     88 void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
     89 
     90 /// \brief Decode a VPERMILP variable mask from an IR-level vector constant.
     91 void DecodeVPERMILPMask(const Constant *C, SmallVectorImpl<int> &ShuffleMask);
     92 
     93 /// \brief Decode a zero extension instruction as a shuffle mask.
     94 void DecodeZeroExtendMask(MVT SrcVT, MVT DstVT,
     95                           SmallVectorImpl<int> &ShuffleMask);
     96 
     97 /// \brief Decode a move lower and zero upper instruction as a shuffle mask.
     98 void DecodeZeroMoveLowMask(MVT VT, SmallVectorImpl<int> &ShuffleMask);
     99 
    100 /// \brief Decode a scalar float move instruction as a shuffle mask.
    101 void DecodeScalarMoveMask(MVT VT, bool IsLoad,
    102                           SmallVectorImpl<int> &ShuffleMask);
    103 } // llvm namespace
    104 
    105 #endif
    106