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[X86][AVX] getFauxShuffleMask - don't widen shuffle inputs from INSERT_SUBVECTOR(X,SHUFFLE(Y,Z)) 

Don't create nodes on the fly when decoding INSERT_SUBVECTOR as faux shuffles.
This commit is contained in:
Simon Pilgrim 2020-05-31 13:19:18 +01:00
parent 45ebe38ffc
commit d33ba1aa0b
1 changed files with 3 additions and 10 deletions
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13
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -7438,9 +7438,9 @@ static bool getFauxShuffleMask(SDValue N, const APInt &DemandedElts,
SubMask, DAG, Depth + 1, ResolveKnownElts))
return false;
// Shuffle inputs must be the same size as the subvector.
// Subvector shuffle inputs must not be larger than the subvector.
if (llvm::any_of(SubInputs, [SubVT](SDValue Op) {
return SubVT.getSizeInBits() != Op.getValueSizeInBits();
return SubVT.getSizeInBits() > Op.getValueSizeInBits();
}))
return false;
@ -7460,14 +7460,7 @@ static bool getFauxShuffleMask(SDValue N, const APInt &DemandedElts,
}
}
Ops.push_back(Src);
for (SDValue &SubInput : SubInputs) {
EVT SubSVT = SubInput.getValueType().getScalarType();
EVT AltVT = EVT::getVectorVT(*DAG.getContext(), SubSVT,
NumSizeInBits / SubSVT.getSizeInBits());
Ops.push_back(DAG.getNode(ISD::INSERT_SUBVECTOR, SDLoc(N), AltVT,
DAG.getUNDEF(AltVT), SubInput,
DAG.getIntPtrConstant(0, SDLoc(N))));
}
Ops.append(SubInputs.begin(), SubInputs.end());
for (int i = 0; i != (int)NumElts; ++i)
Mask.push_back(i);
for (int i = 0; i != (int)NumSubElts; ++i) {