1 files changed, 23 insertions, 0 deletions
diff --git a/test/CodeGen/X86/vec_unsafe-fp-math.ll b/test/CodeGen/X86/vec_unsafe-fp-math.ll
new file mode 100644
index 0000000000..827d4184d1
--- /dev/null
+++ b/test/CodeGen/X86/vec_unsafe-fp-math.ll
@@ -0,0 +1,23 @@
+; RUN: llc < %s -enable-unsafe-fp-math -mtriple=x86_64-unknown-unknown -mcpu=corei7 | FileCheck %s
+
+; Make sure that vectors get the same benefits as scalars when using unsafe-fp-math.
+
+; Subtracting zero is free.
+define <4 x float> @vec_fsub_zero(<4 x float> %x) {
+; CHECK-LABEL: vec_fsub_zero:
+; CHECK-NOT: subps
+; CHECK-NOT: xorps
+; CHECK: retq
+  %sub = fsub <4 x float> %x, zeroinitializer
+  ret <4 x float> %sub
+}
+
+; Negating doesn't require subtraction.
+define <4 x float> @vec_fneg(<4 x float> %x) {
+; CHECK-LABEL: vec_fneg:
+; CHECK: xorps  {{.*}}LCP{{.*}}, %xmm0
+; CHECK-NOT: subps
+; CHECK-NEXT: retq
+  %sub = fsub <4 x float> zeroinitializer, %x
+  ret <4 x float> %sub
+}