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Diffstat (limited to 'contrib/llvm/lib/Target/X86/X86ShuffleDecode.h')
| -rw-r--r-- | contrib/llvm/lib/Target/X86/X86ShuffleDecode.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/X86/X86ShuffleDecode.h b/contrib/llvm/lib/Target/X86/X86ShuffleDecode.h new file mode 100644 index 0000000..df04052 --- /dev/null +++ b/contrib/llvm/lib/Target/X86/X86ShuffleDecode.h @@ -0,0 +1,155 @@ +//===-- X86ShuffleDecode.h - X86 shuffle decode logic ---------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// Define several functions to decode x86 specific shuffle semantics into a +// generic vector mask. +// +//===----------------------------------------------------------------------===// + +#ifndef X86_SHUFFLE_DECODE_H +#define X86_SHUFFLE_DECODE_H + +#include "llvm/ADT/SmallVector.h" +using namespace llvm; + +//===----------------------------------------------------------------------===// +// Vector Mask Decoding +//===----------------------------------------------------------------------===// + +enum { + SM_SentinelZero = ~0U +}; + +static inline +void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<unsigned> &ShuffleMask) { + // Defaults the copying the dest value. + ShuffleMask.push_back(0); + ShuffleMask.push_back(1); + ShuffleMask.push_back(2); + ShuffleMask.push_back(3); + + // Decode the immediate. + unsigned ZMask = Imm & 15; + unsigned CountD = (Imm >> 4) & 3; + unsigned CountS = (Imm >> 6) & 3; + + // CountS selects which input element to use. + unsigned InVal = 4+CountS; + // CountD specifies which element of destination to update. + ShuffleMask[CountD] = InVal; + // ZMask zaps values, potentially overriding the CountD elt. + if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero; + if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero; + if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero; + if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero; +} + +// <3,1> or <6,7,2,3> +static void DecodeMOVHLPSMask(unsigned NElts, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = NElts/2; i != NElts; ++i) + ShuffleMask.push_back(NElts+i); + + for (unsigned i = NElts/2; i != NElts; ++i) + ShuffleMask.push_back(i); +} + +// <0,2> or <0,1,4,5> +static void DecodeMOVLHPSMask(unsigned NElts, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = 0; i != NElts/2; ++i) + ShuffleMask.push_back(i); + + for (unsigned i = 0; i != NElts/2; ++i) + ShuffleMask.push_back(NElts+i); +} + +static void DecodePSHUFMask(unsigned NElts, unsigned Imm, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = 0; i != NElts; ++i) { + ShuffleMask.push_back(Imm % NElts); + Imm /= NElts; + } +} + +static void DecodePSHUFHWMask(unsigned Imm, + SmallVectorImpl<unsigned> &ShuffleMask) { + ShuffleMask.push_back(0); + ShuffleMask.push_back(1); + ShuffleMask.push_back(2); + ShuffleMask.push_back(3); + for (unsigned i = 0; i != 4; ++i) { + ShuffleMask.push_back(4+(Imm & 3)); + Imm >>= 2; + } +} + +static void DecodePSHUFLWMask(unsigned Imm, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = 0; i != 4; ++i) { + ShuffleMask.push_back((Imm & 3)); + Imm >>= 2; + } + ShuffleMask.push_back(4); + ShuffleMask.push_back(5); + ShuffleMask.push_back(6); + ShuffleMask.push_back(7); +} + +static void DecodePUNPCKLMask(unsigned NElts, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = 0; i != NElts/2; ++i) { + ShuffleMask.push_back(i); + ShuffleMask.push_back(i+NElts); + } +} + +static void DecodePUNPCKHMask(unsigned NElts, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = 0; i != NElts/2; ++i) { + ShuffleMask.push_back(i+NElts/2); + ShuffleMask.push_back(i+NElts+NElts/2); + } +} + +static void DecodeSHUFPSMask(unsigned NElts, unsigned Imm, + SmallVectorImpl<unsigned> &ShuffleMask) { + // Part that reads from dest. + for (unsigned i = 0; i != NElts/2; ++i) { + ShuffleMask.push_back(Imm % NElts); + Imm /= NElts; + } + // Part that reads from src. + for (unsigned i = 0; i != NElts/2; ++i) { + ShuffleMask.push_back(Imm % NElts + NElts); + Imm /= NElts; + } +} + +static void DecodeUNPCKHPMask(unsigned NElts, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = 0; i != NElts/2; ++i) { + ShuffleMask.push_back(i+NElts/2); // Reads from dest + ShuffleMask.push_back(i+NElts+NElts/2); // Reads from src + } +} + + +/// DecodeUNPCKLPMask - This decodes the shuffle masks for unpcklps/unpcklpd +/// etc. NElts indicates the number of elements in the vector allowing it to +/// handle different datatypes and vector widths. +static void DecodeUNPCKLPMask(unsigned NElts, + SmallVectorImpl<unsigned> &ShuffleMask) { + for (unsigned i = 0; i != NElts/2; ++i) { + ShuffleMask.push_back(i); // Reads from dest + ShuffleMask.push_back(i+NElts); // Reads from src + } +} + +#endif |
