diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/subCommutativity.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/subCommutativity.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+assertEq(6 - ((void 0) ^ 0x80000005), 2147483649);
+
+var x = ((void 0) ^ 0x80000005);
+assertEq(6 - x, 2147483649);