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[X86] getFauxShuffleMask - only handle VTRUNC nodes with matching src/dst sizes #134161

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Merged
merged 2 commits into from
Apr 3, 2025
Merged

[X86] getFauxShuffleMask - only handle VTRUNC nodes with matching src/dst sizes #134161

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6a0e632
[X86] getFauxShuffleMask - only handle VTRUNC nodes with matching src…
RKSimon Apr 2, 2025
79420b3
Merge branch 'main' into x86-faux-shuffle-vtrunc
RKSimon Apr 3, 2025
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4 changes: 1 addition & 3 deletions llvm/lib/Target/X86/X86ISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6413,9 +6413,7 @@ static bool getFauxShuffleMask(SDValue N, const APInt &DemandedElts,
case X86ISD::VTRUNC: {
SDValue Src = N.getOperand(0);
EVT SrcVT = Src.getValueType();
// Truncated source must be a simple vector.
if (!SrcVT.isSimple() || (SrcVT.getSizeInBits() % 128) != 0 ||
(SrcVT.getScalarSizeInBits() % 8) != 0)
if (SrcVT.getSizeInBits() != NumSizeInBits)
return false;
unsigned NumSrcElts = SrcVT.getVectorNumElements();
unsigned NumBitsPerSrcElt = SrcVT.getScalarSizeInBits();
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