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Allow constant folding of copysign 

llvm-svn: 203076
This commit is contained in:
Karthik Bhat 2014-03-06 05:32:52 +00:00
parent da1ebedeea
commit daa8cd10d9
2 changed files with 56 additions and 0 deletions
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7
llvm/lib/Analysis/ConstantFolding.cpp
View File

@ -1195,6 +1195,7 @@ bool llvm::canConstantFoldCallTo(const Function *F) {
case Intrinsic::cttz:
case Intrinsic::fma:
case Intrinsic::fmuladd:
case Intrinsic::copysign:
case Intrinsic::sadd_with_overflow:
case Intrinsic::uadd_with_overflow:
case Intrinsic::ssub_with_overflow:
@ -1532,6 +1533,12 @@ static Constant *ConstantFoldScalarCall(StringRef Name, unsigned IntrinsicID,
if (IntrinsicID == Intrinsic::pow) {
return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
}
if (IntrinsicID == Intrinsic::copysign) {
APFloat V1 = Op1->getValueAPF();
APFloat V2 = Op2->getValueAPF();
V1.copySign(V2);
return ConstantFP::get(Ty->getContext(), V1);
}
if (!TLI)
return 0;
if (Name == "pow" && TLI->has(LibFunc::pow))

49
llvm/test/Transforms/InstCombine/copysign.ll Normal file
View File

@ -0,0 +1,49 @@
; RUN: opt -S -instcombine < %s | FileCheck %s
declare float @llvm.copysign.f32(float, float) #0
declare double @llvm.copysign.f64(double, double) #0
; CHECK-LABEL: @constant_fold_copysign_f32_01
; CHECK-NEXT: ret float -1.000000e+00
define float @constant_fold_copysign_f32_01() #0 {
%x = call float @llvm.copysign.f32(float 1.0, float -2.0) #0
ret float %x
}
; CHECK-LABEL: @constant_fold_copysign_f32_02
; CHECK-NEXT: ret float 2.000000e+00
define float @constant_fold_copysign_f32_02() #0 {
%x = call float @llvm.copysign.f32(float -2.0, float 1.0) #0
ret float %x
}
; CHECK-LABEL: @constant_fold_copysign_f32_03
; CHECK-NEXT: ret float -2.000000e+00
define float @constant_fold_copysign_f32_03() #0 {
%x = call float @llvm.copysign.f32(float -2.0, float -1.0) #0
ret float %x
}
; CHECK-LABEL: @constant_fold_copysign_f64_01
; CHECK-NEXT: ret double -1.000000e+00
define double @constant_fold_copysign_f64_01() #0 {
%x = call double @llvm.copysign.f64(double 1.0, double -2.0) #0
ret double %x
}
; CHECK-LABEL: @constant_fold_copysign_f64_02
; CHECK-NEXT: ret double 1.000000e+00
define double @constant_fold_copysign_f64_02() #0 {
%x = call double @llvm.copysign.f64(double -1.0, double 2.0) #0
ret double %x
}
; CHECK-LABEL: @constant_fold_copysign_f64_03
; CHECK-NEXT: ret double -1.000000e+00
define double @constant_fold_copysign_f64_03() #0 {
%x = call double @llvm.copysign.f64(double -1.0, double -2.0) #0
ret double %x
}
attributes #0 = { nounwind readnone }