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[ValueTracking][RISCV] Use ConstantRange::getUnsignedMax instead of getUpper to simplify some code. #96816

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Merged
merged 1 commit into from
Jun 27, 2024
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[ValueTracking][RISCV] Use ConstantRange::getUnsignedMax instead of getUpper to simplify some code. #96816

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4 changes: 1 addition & 3 deletions llvm/lib/Analysis/ValueTracking.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1740,10 +1740,8 @@ static void computeKnownBitsFromOperator(const Operator *I,
cast<ConstantInt>(II->getArgOperand(HasAVL))->getZExtValue());
RISCVII::VLMUL VLMUL = static_cast<RISCVII::VLMUL>(
cast<ConstantInt>(II->getArgOperand(1 + HasAVL))->getZExtValue());
// The Range is [Lower, Upper), so we need to subtract 1 here to get the
// real upper value.
uint64_t MaxVLEN =
(Range.getUpper().getZExtValue() - 1) * RISCV::RVVBitsPerBlock;
Range.getUnsignedMax().getZExtValue() * RISCV::RVVBitsPerBlock;
uint64_t MaxVL = MaxVLEN / RISCVVType::getSEWLMULRatio(SEW, VLMUL);

// Result of vsetvli must be not larger than AVL.
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