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[RISCV] Limit VLEN in getOptimalMemOpType to prevent creating invalid MVTs. #139116

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Merged
merged 3 commits into from
May 8, 2025
Merged

[RISCV] Limit VLEN in getOptimalMemOpType to prevent creating invalid MVTs. #139116

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d3b19ae
[RISCV] Limit VLEN in getOptimalMemOpType to prevent creating invalid…
topperc May 8, 2025
dfb9d83
fixup! clang-format/
topperc May 8, 2025
ea26287
fixup! test case
topperc May 8, 2025
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5 changes: 4 additions & 1 deletion llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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Expand Up @@ -23487,7 +23487,10 @@ EVT RISCVTargetLowering::getOptimalMemOpType(const MemOp &Op,
// combining will typically form larger LMUL operations from the LMUL1
// operations emitted here, and that's okay because combining isn't
// introducing new memory operations; it's just merging existing ones.
const unsigned MinVLenInBytes = Subtarget.getRealMinVLen()/8;
// NOTE: We limit to 1024 bytes to avoid creating an invalid MVT.
const unsigned MinVLenInBytes =
std::min(Subtarget.getRealMinVLen() / 8, 1024U);

if (Op.size() < MinVLenInBytes)
// TODO: Figure out short memops. For the moment, do the default thing
// which ends up using scalar sequences.
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