[llvm] r204583 - Allow constant folding of ceil function whenever feasible

[Karthik Bhat]

Author: karthik
Date: Sun Mar 23 23:36:06 2014
New Revision: 204583

URL: http://llvm.org/viewvc/llvm-project?rev=204583&view=rev
Log:
Allow constant folding of ceil function whenever feasible

Added:
    llvm/trunk/test/Transforms/InstCombine/ceil.ll
Modified:
    llvm/trunk/lib/Analysis/ConstantFolding.cpp

Modified: llvm/trunk/lib/Analysis/ConstantFolding.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ConstantFolding.cpp?rev=204583&r1=204582&r2=204583&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/ConstantFolding.cpp (original)
+++ llvm/trunk/lib/Analysis/ConstantFolding.cpp Sun Mar 23 23:36:06 2014
@@ -1186,6 +1186,7 @@ bool llvm::canConstantFoldCallTo(const 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(
 #endif
         case Intrinsic::floor:
           return ConstantFoldFP(floor, V, Ty);
+        case Intrinsic::ceil:
+          return ConstantFoldFP(ceil, V, Ty);
       }
 
       if (!TLI)

Added: llvm/trunk/test/Transforms/InstCombine/ceil.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/ceil.ll?rev=204583&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/ceil.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/ceil.ll Sun Mar 23 23:36:06 2014
@@ -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 }