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[ConstantFold] Fix result type when folding powi.f16 #98681

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Merged
merged 4 commits into from
Jul 15, 2024
Merged

[ConstantFold] Fix result type when folding powi.f16 #98681

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a0097cb
[ConstantFold] Fix result type when folding powi.f16
dtcxzyw Jul 12, 2024
b0a1393
[ConstandFold] Address review comments. NFC.
dtcxzyw Jul 12, 2024
00fce82
[ConstantFold] Use `ConstantFP::get(Ty, double)`
dtcxzyw Jul 12, 2024
0d11d5a
[ConstantFold] Address review comments.
dtcxzyw Jul 13, 2024
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12 changes: 7 additions & 5 deletions llvm/lib/Analysis/ConstantFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2760,11 +2760,13 @@ static Constant *ConstantFoldIntrinsicCall2(Intrinsic::ID IntrinsicID, Type *Ty,

if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy())
return nullptr;
if (IntrinsicID == Intrinsic::powi && Ty->isHalfTy())
return ConstantFP::get(
Ty->getContext(),
APFloat((float)std::pow((float)Op1V.convertToDouble(),
(int)Op2C->getZExtValue())));
if (IntrinsicID == Intrinsic::powi && Ty->isHalfTy()) {
APFloat Res((float)std::pow((float)Op1V.convertToDouble(),
(int)Op2C->getZExtValue()));
bool unused;
Res.convert(APFloat::IEEEhalf(), APFloat::rmNearestTiesToEven, &unused);
return ConstantFP::get(Ty->getContext(), Res);
}
if (IntrinsicID == Intrinsic::powi && Ty->isFloatTy())
return ConstantFP::get(
Ty->getContext(),
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11 changes: 11 additions & 0 deletions llvm/test/Transforms/InstSimplify/ConstProp/pr98665.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=instsimplify -S | FileCheck %s
; Make sure that the type is correct after constant folding

define half @pr98665() {
; CHECK-LABEL: define half @pr98665() {
; CHECK-NEXT: ret half 0xH3C00
;
%x = call half @llvm.powi.f16.i32(half 0xH3C00, i32 1)
ret half %x
}
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