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Revert rL344933 from llvm/trunk: [X86][SSE] Tidyup DecodeVPERMILPMask shuffle mask decoding

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We can't safely assume that certain RawMask entries are UNDEF as most variable shuffles ignore non-index bits.
........
Add support for UNDEF raw mask elements and remove the ConstantPool DecodeVPERMILPMask usage in X86ISelLowering.cpp

llvm-svn: 344936
This commit is contained in:
Simon Pilgrim 2018-10-22 18:58:32 +00:00
parent f8047f57bb
commit ee8a57df9e
2 changed files with 5 additions and 5 deletions
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4
lib/Target/X86/Utils/X86ShuffleDecode.cpp
View File

@ -501,10 +501,6 @@ void DecodeVPERMILPMask(unsigned NumElts, unsigned ScalarBits,
for (unsigned i = 0, e = RawMask.size(); i < e; ++i) {
uint64_t M = RawMask[i];
if (M == (uint64_t)SM_SentinelUndef) {
ShuffleMask.push_back(M);
continue;
}
M = (ScalarBits == 64 ? ((M >> 1) & 0x1) : (M & 0x3));
unsigned LaneOffset = i & ~(NumEltsPerLane - 1);
ShuffleMask.push_back((int)(LaneOffset + M));

6
lib/Target/X86/X86ISelLowering.cpp
View File

@ -6043,10 +6043,14 @@ static bool getTargetShuffleMask(SDNode *N, MVT VT, bool AllowSentinelZero,
IsUnary = true;
SDValue MaskNode = N->getOperand(1);
SmallVector<uint64_t, 32> RawMask;
if (getTargetShuffleMaskIndices(MaskNode, MaskEltSize, RawMask, true)) {
if (getTargetShuffleMaskIndices(MaskNode, MaskEltSize, RawMask)) {
DecodeVPERMILPMask(NumElems, MaskEltSize, RawMask, Mask);
break;
}
if (auto *C = getTargetConstantFromNode(MaskNode)) {
DecodeVPERMILPMask(C, MaskEltSize, Mask);
break;
}
return false;
}
case X86ISD::PSHUFB: {