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[RISCV] Make single source reverse legal in isShuffleMaskLegal #125949

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Merged
merged 2 commits into from
Feb 6, 2025
Merged

[RISCV] Make single source reverse legal in isShuffleMaskLegal #125949

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115aeb0
[RISCV] Make single source reverse legal in isShuffleMaskLegal
preames Feb 5, 2025
1512332
Address review comment
preames Feb 6, 2025
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5 changes: 5 additions & 0 deletions llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5811,6 +5811,11 @@ bool RISCVTargetLowering::isShuffleMaskLegal(ArrayRef<int> M, EVT VT) const {
if (SVT.getScalarType() == MVT::i1)
return false;

unsigned NumElts = M.size();
if (ShuffleVectorInst::isReverseMask(M, NumElts) &&
ShuffleVectorInst::isSingleSourceMask(M, NumElts))
return true;

int Dummy1, Dummy2;
return (isElementRotate(Dummy1, Dummy2, M) > 0) ||
isInterleaveShuffle(M, SVT, Dummy1, Dummy2, Subtarget);
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