--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/X86/neg_fp.ll	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,12 @@
+; RUN: llc < %s -march=x86 -mattr=+sse4.1 -o %t
+; RUN: grep xorps %t | count 1
+
+; Test that when we don't -enable-unsafe-fp-math, we don't do the optimization
+; -0 - (A - B) to (B - A) because A==B, -0 != 0
+
+define float @negfp(float %a, float %b) {
+entry:
+	%sub = fsub float %a, %b		; <float> [#uses=1]
+	%neg = fsub float -0.000000e+00, %sub		; <float> [#uses=1]
+	ret float %neg
+}