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Allow constant folding of round function whenever feasible
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203198 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1196,6 +1196,7 @@ bool llvm::canConstantFoldCallTo(const Function *F) {
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case Intrinsic::fma:
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case Intrinsic::fmuladd:
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case Intrinsic::copysign:
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case Intrinsic::round:
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case Intrinsic::sadd_with_overflow:
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case Intrinsic::uadd_with_overflow:
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case Intrinsic::ssub_with_overflow:
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@ -1345,6 +1346,12 @@ static Constant *ConstantFoldScalarCall(StringRef Name, unsigned IntrinsicID,
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if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy())
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return 0;
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if (IntrinsicID == Intrinsic::round) {
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APFloat V = Op->getValueAPF();
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V.roundToIntegral(APFloat::rmNearestTiesToAway);
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return ConstantFP::get(Ty->getContext(), V);
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}
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/// We only fold functions with finite arguments. Folding NaN and inf is
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/// likely to be aborted with an exception anyway, and some host libms
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/// have known errors raising exceptions.
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90
test/Transforms/InstCombine/round.ll
Normal file
90
test/Transforms/InstCombine/round.ll
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@ -0,0 +1,90 @@
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; RUN: opt -S -instcombine < %s | FileCheck %s
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declare float @llvm.round.f32(float) #0
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declare double @llvm.round.f64(double) #0
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; CHECK-LABEL: @constant_fold_round_f32_01
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; CHECK-NEXT: ret float 1.000000e+00
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define float @constant_fold_round_f32_01() #0 {
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%x = call float @llvm.round.f32(float 1.25) #0
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ret float %x
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}
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; CHECK-LABEL: @constant_fold_round_f32_02
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; CHECK-NEXT: ret float -1.000000e+00
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define float @constant_fold_round_f32_02() #0 {
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%x = call float @llvm.round.f32(float -1.25) #0
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ret float %x
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}
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; CHECK-LABEL: @constant_fold_round_f32_03
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; CHECK-NEXT: ret float 2.000000e+00
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define float @constant_fold_round_f32_03() #0 {
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%x = call float @llvm.round.f32(float 1.5) #0
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ret float %x
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}
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; CHECK-LABEL: @constant_fold_round_f32_04
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; CHECK-NEXT: ret float -2.000000e+00
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define float @constant_fold_round_f32_04() #0 {
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%x = call float @llvm.round.f32(float -1.5) #0
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ret float %x
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}
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; CHECK-LABEL: @constant_fold_round_f32_05
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; CHECK-NEXT: ret float 3.000000e+00
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define float @constant_fold_round_f32_05() #0 {
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%x = call float @llvm.round.f32(float 2.75) #0
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ret float %x
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}
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; CHECK-LABEL: @constant_fold_round_f32_06
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; CHECK-NEXT: ret float -3.000000e+00
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define float @constant_fold_round_f32_06() #0 {
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%x = call float @llvm.round.f32(float -2.75) #0
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ret float %x
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}
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; CHECK-LABEL: @constant_fold_round_f64_01
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; CHECK-NEXT: ret double 1.000000e+00
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define double @constant_fold_round_f64_01() #0 {
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%x = call double @llvm.round.f64(double 1.3) #0
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ret double %x
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}
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; CHECK-LABEL: @constant_fold_round_f64_02
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; CHECK-NEXT: ret double -1.000000e+00
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define double @constant_fold_round_f64_02() #0 {
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%x = call double @llvm.round.f64(double -1.3) #0
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ret double %x
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}
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; CHECK-LABEL: @constant_fold_round_f64_03
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; CHECK-NEXT: ret double 2.000000e+00
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define double @constant_fold_round_f64_03() #0 {
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%x = call double @llvm.round.f64(double 1.5) #0
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ret double %x
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}
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; CHECK-LABEL: @constant_fold_round_f64_04
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; CHECK-NEXT: ret double -2.000000e+00
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define double @constant_fold_round_f64_04() #0 {
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%x = call double @llvm.round.f64(double -1.5) #0
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ret double %x
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}
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; CHECK-LABEL: @constant_fold_round_f64_05
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; CHECK-NEXT: ret double 3.000000e+00
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define double @constant_fold_round_f64_05() #0 {
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%x = call double @llvm.round.f64(double 2.7) #0
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ret double %x
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}
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; CHECK-LABEL: @constant_fold_round_f64_06
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; CHECK-NEXT: ret double -3.000000e+00
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define double @constant_fold_round_f64_06() #0 {
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%x = call double @llvm.round.f64(double -2.7) #0
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ret double %x
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}
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attributes #0 = { nounwind readnone }
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