diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/string-compare.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/string-compare.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function f(a, b) {
+    return a == b;
+}
+
+var X = "" + Math.random();
+var Y = "" + Math.random();
+
+assertEq(f(X + Y, X + Y), true);
+