SimplifyLibcalls: Add fabs and trunc to the list of libcalls that are safe to shrink from double to float.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162173 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 27 insertions, 0 deletions

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index f110320c1b..3904419012 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -1641,6 +1641,8 @@ void SimplifyLibCalls::InitOptimizations() {
   Optimizations["llvm.exp2.f64"] = &Exp2;
   Optimizations["llvm.exp2.f32"] = &Exp2;
 
+  if (TLI->has(LibFunc::fabs) && TLI->has(LibFunc::fabsf))
+    Optimizations["fabs"] = &UnaryDoubleFP;
   if (TLI->has(LibFunc::floor) && TLI->has(LibFunc::floorf))
     Optimizations["floor"] = &UnaryDoubleFP;
   if (TLI->has(LibFunc::ceil) && TLI->has(LibFunc::ceilf))
@@ -1651,6 +1653,8 @@ void SimplifyLibCalls::InitOptimizations() {
     Optimizations["rint"] = &UnaryDoubleFP;
   if (TLI->has(LibFunc::nearbyint) && TLI->has(LibFunc::nearbyintf))
     Optimizations["nearbyint"] = &UnaryDoubleFP;
+  if (TLI->has(LibFunc::trunc) && TLI->has(LibFunc::truncf))
+    Optimizations["trunc"] = &UnaryDoubleFP;
 
   // Integer Optimizations
   Optimizations["ffs"] = &FFS;
diff --git a/test/Transforms/SimplifyLibCalls/floor.ll b/test/Transforms/SimplifyLibCalls/floor.ll
index 03dcdf585f..93c62c2002 100644
--- a/test/Transforms/SimplifyLibCalls/floor.ll
+++ b/test/Transforms/SimplifyLibCalls/floor.ll
@@ -9,6 +9,8 @@
 ; DO-SIMPLIFY: call float @ceilf(
 ; DO-SIMPLIFY: call float @roundf(
 ; DO-SIMPLIFY: call float @nearbyintf(
+; DO-SIMPLIFY: call float @truncf(
+; DO-SIMPLIFY: call float @fabsf(
 
 ; C89-SIMPLIFY: call float @floorf(
 ; C89-SIMPLIFY: call float @ceilf(
@@ -19,6 +21,8 @@
 ; DONT-SIMPLIFY: call double @ceil(
 ; DONT-SIMPLIFY: call double @round(
 ; DONT-SIMPLIFY: call double @nearbyint(
+; DONT-SIMPLIFY: call double @trunc(
+; DONT-SIMPLIFY: call double @fabs(
 
 declare double @floor(double)
 
@@ -28,6 +32,10 @@ declare double @round(double)
 
 declare double @nearbyint(double)
 
+declare double @trunc(double)
+
+declare double @fabs(double)
+
 define float @test_floor(float %C) {
 	%D = fpext float %C to double		; <double> [#uses=1]
         ; --> floorf
@@ -60,3 +68,18 @@ define float @test_nearbyint(float %C) {
 	ret float %F
 }
 
+define float @test_trunc(float %C) {
+	%D = fpext float %C to double
+	; --> truncf
+        %E = call double @trunc(double %D)
+	%F = fptrunc double %E to float
+	ret float %F
+}
+
+define float @test_fabs(float %C) {
+	%D = fpext float %C to double
+	; --> fabsf
+        %E = call double @fabs(double %D)
+	%F = fptrunc double %E to float
+	ret float %F
+}