diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testLoopWithUndefined2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testLoopWithUndefined2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+function loopWithUndefined2(t, dostuff, val) {
+    var a = new Array(6);
+    for (var i = 0; i < 6; i++) {
+        if (dostuff) {
+            val = 1;
+            a[i] = (t > val);
+        } else {
+            a[i] = (val == undefined);
+        }
+    }
+    return a;
+}
+function testLoopWithUndefined2() {
+    var a = loopWithUndefined2(5.0, true, 2);
+    var b = loopWithUndefined2(5.0, true);
+    var c = loopWithUndefined2(5.0, false, 8);
+    var d = loopWithUndefined2(5.0, false);
+    return [a[0], b[0], c[0], d[0]].join(",");
+}
+assertEq(testLoopWithUndefined2(), "true,true,false,true");