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[ConstantFolding] Fix nvvm_round folding on PPC #149837

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Merged
merged 1 commit into from
Jul 21, 2025
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[ConstantFolding] Fix nvvm_round folding on PPC #149837

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13 changes: 8 additions & 5 deletions llvm/lib/Analysis/ConstantFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2677,11 +2677,14 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,

case Intrinsic::nvvm_round_ftz_f:
case Intrinsic::nvvm_round_f:
case Intrinsic::nvvm_round_d:
return ConstantFoldFP(
round, APF, Ty,
nvvm::GetNVVMDenromMode(
nvvm::UnaryMathIntrinsicShouldFTZ(IntrinsicID)));
case Intrinsic::nvvm_round_d: {
// Use APFloat implementation instead of native libm call, as some
// implementations (e.g. on PPC) do not preserve the sign of negative 0.
bool IsFTZ = nvvm::UnaryMathIntrinsicShouldFTZ(IntrinsicID);
auto V = IsFTZ ? FTZPreserveSign(APF) : APF;
V.roundToIntegral(APFloat::rmNearestTiesToAway);
return ConstantFP::get(Ty->getContext(), V);
}

case Intrinsic::nvvm_saturate_ftz_f:
case Intrinsic::nvvm_saturate_d:
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