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[X86][SSE] combineX86ShuffleChain - use resolveZeroablesFromTargetShuffle helper. NFCI.

This commit is contained in:
Simon Pilgrim 2019-10-30 18:25:32 +00:00
parent 7904bd9409
commit 94a4a2c97f
1 changed files with 3 additions and 4 deletions
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7
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -32414,10 +32414,9 @@ static SDValue combineX86ShuffleChain(ArrayRef<SDValue> Inputs, SDValue Root,
(!MaskVT.is256BitVector() || Subtarget.hasAVX2());
// Determine zeroable mask elements.
APInt Zeroable(NumMaskElts, 0);
for (unsigned i = 0; i != NumMaskElts; ++i)
if (isUndefOrZero(Mask[i]))
Zeroable.setBit(i);
APInt KnownUndef, KnownZero;
resolveZeroablesFromTargetShuffle(Mask, KnownUndef, KnownZero);
APInt Zeroable = KnownUndef | KnownZero;
if (UnaryShuffle) {
// If we are shuffling a X86ISD::VZEXT_LOAD then we can use the load