Apply the SSE dependence idiom for SSE unary operations to

SD instructions too, in addition to SS instructions. And
add a comment about it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108191 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 41 insertions, 0 deletions

diff --git a/test/CodeGen/X86/break-sse-dep.ll b/test/CodeGen/X86/break-sse-dep.ll
index 027d2f1..094cbc7 100644
--- a/test/CodeGen/X86/break-sse-dep.ll
+++ b/test/CodeGen/X86/break-sse-dep.ll
@@ -19,3 +19,44 @@ entry:
   %1 = fptrunc double %0 to float
   ret float %1
 }
+
+define float @squirtf(float* %x) nounwind {
+entry:
+; CHECK: squirtf:
+; CHECK: movss (%rdi), %xmm0
+; CHECK: sqrtss %xmm0, %xmm0
+  %z = load float* %x
+  %t = call float @llvm.sqrt.f32(float %z)
+  ret float %t
+}
+
+define double @squirt(double* %x) nounwind {
+entry:
+; CHECK: squirt:
+; CHECK: movsd (%rdi), %xmm0
+; CHECK: sqrtsd %xmm0, %xmm0
+  %z = load double* %x
+  %t = call double @llvm.sqrt.f64(double %z)
+  ret double %t
+}
+
+define float @squirtf_size(float* %x) nounwind optsize {
+entry:
+; CHECK: squirtf_size:
+; CHECK: sqrtss (%rdi), %xmm0
+  %z = load float* %x
+  %t = call float @llvm.sqrt.f32(float %z)
+  ret float %t
+}
+
+define double @squirt_size(double* %x) nounwind optsize {
+entry:
+; CHECK: squirt_size:
+; CHECK: sqrtsd (%rdi), %xmm0
+  %z = load double* %x
+  %t = call double @llvm.sqrt.f64(double %z)
+  ret double %t
+}
+
+declare float @llvm.sqrt.f32(float)
+declare double @llvm.sqrt.f64(double)