From: Karthik Bhat <kv.bhat@samsung.com>
Date: Mon, 24 Mar 2014 04:36:06 +0000 (+0000)
Subject: Allow constant folding of ceil function whenever feasible
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=07707e8969a3936f216874f314c5f8ceaa594a90;p=oota-llvm.git

Allow constant folding of ceil function whenever feasible

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204583 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 8ff79d6f625..782acfa0516 100644
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -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)
diff --git a/test/Transforms/InstCombine/ceil.ll b/test/Transforms/InstCombine/ceil.ll
new file mode 100644
index 00000000000..9f965a3c34b
--- /dev/null
+++ b/test/Transforms/InstCombine/ceil.ll
@@ -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 }