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Allow constant folding of ceil function whenever feasible

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204583 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Karthik Bhat 2014-03-24 04:36:06 +00:00
parent 0259b8e14f
commit 07707e8969
2 changed files with 59 additions and 0 deletions
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3
lib/Analysis/ConstantFolding.cpp
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@ -1186,6 +1186,7 @@ bool llvm::canConstantFoldCallTo(const Function *F) {
case Intrinsic::exp:
case Intrinsic::exp2:
case Intrinsic::floor:
case Intrinsic::ceil:
case Intrinsic::sqrt:
case Intrinsic::pow:
case Intrinsic::powi:
@ -1390,6 +1391,8 @@ static Constant *ConstantFoldScalarCall(StringRef Name, unsigned IntrinsicID,
#endif
case Intrinsic::floor:
return ConstantFoldFP(floor, V, Ty);
case Intrinsic::ceil:
return ConstantFoldFP(ceil, V, Ty);
}
if (!TLI)

56
test/Transforms/InstCombine/ceil.ll Normal file
View File

@ -0,0 +1,56 @@
; RUN: opt -S -instcombine < %s | FileCheck %s
declare float @llvm.ceil.f32(float) #0
declare double @llvm.ceil.f64(double) #0
declare <4 x float> @llvm.ceil.v4f32(<4 x float>) #0
; CHECK-LABEL: @constant_fold_ceil_f32_01
; CHECK-NEXT: ret float 1.000000e+00
define float @constant_fold_ceil_f32_01() #0 {
%x = call float @llvm.ceil.f32(float 1.00) #0
ret float %x
}
; CHECK-LABEL: @constant_fold_ceil_f32_02
; CHECK-NEXT: ret float 2.000000e+00
define float @constant_fold_ceil_f32_02() #0 {
%x = call float @llvm.ceil.f32(float 1.25) #0
ret float %x
}
; CHECK-LABEL: @constant_fold_ceil_f32_03
; CHECK-NEXT: ret float -1.000000e+00
define float @constant_fold_ceil_f32_03() #0 {
%x = call float @llvm.ceil.f32(float -1.25) #0
ret float %x
}
; CHECK-LABEL: @constant_fold_ceil_v4f32_01
; CHECK-NEXT: ret <4 x float> <float 1.000000e+00, float 2.000000e+00, float -1.000000e+00, float -1.000000e+00>
define <4 x float> @constant_fold_ceil_v4f32_01() #0 {
%x = call <4 x float> @llvm.ceil.v4f32(<4 x float> <float 1.00, float 1.25, float -1.25, float -1.00>)
ret <4 x float> %x
}
; CHECK-LABEL: @constant_fold_ceil_f64_01
; CHECK-NEXT: ret double 1.000000e+00
define double @constant_fold_ceil_f64_01() #0 {
%x = call double @llvm.ceil.f64(double 1.0) #0
ret double %x
}
; CHECK-LABEL: @constant_fold_ceil_f64_02
; CHECK-NEXT: ret double 2.000000e+00
define double @constant_fold_ceil_f64_02() #0 {
%x = call double @llvm.ceil.f64(double 1.3) #0
ret double %x
}
; CHECK-LABEL: @constant_fold_ceil_f64_03
; CHECK-NEXT: ret double -1.000000e+00
define double @constant_fold_ceil_f64_03() #0 {
%x = call double @llvm.ceil.f64(double -1.75) #0
ret double %x
}
attributes #0 = { nounwind readnone }