Turn MipsOptimizeMathLibCalls into a target-independent scalar transform

...so that it can be used for z too.  Most of the code is the same.
The only real change is to use TargetTransformInfo to test when a sqrt
instruction is available.

The pass is opt-in because at the moment it only handles sqrt.

llvm-svn: 189097

2 files changed, 31 insertions, 1 deletions

diff --git a/llvm/test/CodeGen/SystemZ/fp-sqrt-01.ll b/llvm/test/CodeGen/SystemZ/fp-sqrt-01.ll
index b6568d6f01c..7465af456b8 100644
--- a/llvm/test/CodeGen/SystemZ/fp-sqrt-01.ll
+++ b/llvm/test/CodeGen/SystemZ/fp-sqrt-01.ll
@@ -2,7 +2,8 @@
 ;
 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
 
-declare float @llvm.sqrt.f32(float %f)
+declare float @llvm.sqrt.f32(float)
+declare float @sqrtf(float)
 
 ; Check register square root.
 define float @f1(float %val) {
@@ -152,3 +153,17 @@ define void @f7(float *%ptr) {
 
   ret void
 }
+
+; Check that a call to the normal sqrtf function is lowered.
+define float @f8(float %dummy, float %val) {
+; CHECK-LABEL: f8:
+; CHECK: sqebr %f0, %f2
+; CHECK: cebr %f0, %f0
+; CHECK: jo [[LABEL:\.L.*]]
+; CHECK: br %r14
+; CHECK: [[LABEL]]:
+; CHECK: ler %f0, %f2
+; CHECK: jg sqrtf@PLT
+  %res = tail call float @sqrtf(float %val)
+  ret float %res
+}
diff --git a/llvm/test/CodeGen/SystemZ/fp-sqrt-02.ll b/llvm/test/CodeGen/SystemZ/fp-sqrt-02.ll
index b07a2c66fb4..66ffd19d6c3 100644
--- a/llvm/test/CodeGen/SystemZ/fp-sqrt-02.ll
+++ b/llvm/test/CodeGen/SystemZ/fp-sqrt-02.ll
@@ -3,6 +3,7 @@
 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
 
 declare double @llvm.sqrt.f64(double %f)
+declare double @sqrt(double)
 
 ; Check register square root.
 define double @f1(double %val) {
@@ -152,3 +153,17 @@ define void @f7(double *%ptr) {
 
   ret void
 }
+
+; Check that a call to the normal sqrt function is lowered.
+define double @f8(double %dummy, double %val) {
+; CHECK-LABEL: f8:
+; CHECK: sqdbr %f0, %f2
+; CHECK: cdbr %f0, %f0
+; CHECK: jo [[LABEL:\.L.*]]
+; CHECK: br %r14
+; CHECK: [[LABEL]]:
+; CHECK: ldr %f0, %f2
+; CHECK: jg sqrt@PLT
+  %res = tail call double @sqrt(double %val)
+  ret double %res
+}