diff --git a/test/Transforms/Reassociate/negation.ll b/test/Transforms/Reassociate/negation.ll
new file mode 100644
index 00000000000..ba7fe6fbeb3
--- /dev/null
+++ b/test/Transforms/Reassociate/negation.ll
@@ -0,0 +1,20 @@
+; RUN: llvm-as < %s | opt -reassociate -instcombine | llvm-dis | not grep sub
+
+; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z.
+
+int %test1(int %a, int %b, int %z) {
+	%c = sub int 0, %z
+	%d = mul int %a, %b
+	%e = mul int %c, %d
+	%f = mul int %e, 12345
+	%g = sub int 0, %f
+	ret int %g
+}
+
+int %test2(int %a, int %b, int %z) {
+	%d = mul int %z, 40
+	%c = sub int 0, %d
+	%e = mul int %a, %c
+	%f = sub int 0, %e
+	ret int %f
+}