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[RISCV] Disable combineToVCPOP for illegal scalable vector types. #140195

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Merged
merged 2 commits into from
May 16, 2025
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[RISCV] Disable combineToVCPOP for illegal scalable vector types. #140195

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94aadc8
[RISCV] Disable combineToVCPOP for illegal scalable vector types.
topperc May 16, 2025
56bfb39
fixup! More check-prefixes
topperc May 16, 2025
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7 changes: 4 additions & 3 deletions llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18798,6 +18798,10 @@ static SDValue combineToVCPOP(SDNode *N, SelectionDAG &DAG,
if (!SrcMVT.isVector() || SrcMVT.getVectorElementType() != MVT::i1)
return SDValue();

const TargetLowering &TLI = DAG.getTargetLoweringInfo();
if (!TLI.isTypeLegal(SrcMVT))
return SDValue();

// Check that destination type is large enough to hold result without
// overflow.
if (Opc == ISD::VECREDUCE_ADD) {
Expand All @@ -18814,9 +18818,6 @@ static SDValue combineToVCPOP(SDNode *N, SelectionDAG &DAG,

MVT ContainerVT = SrcMVT;
if (SrcMVT.isFixedLengthVector()) {
if (!useRVVForFixedLengthVectorVT(SrcMVT, Subtarget))
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@topperc topperc May 16, 2025

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This should be equivalent to the isTypeLegal check so I removed it.

return SDValue();

ContainerVT = getContainerForFixedLengthVector(DAG, SrcMVT, Subtarget);
Src = convertToScalableVector(ContainerVT, Src, DAG, Subtarget);
}
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