diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug953164.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug953164.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+function test(a) {
+    var total = 0;
+    for (var i=0; i<100; i++) {
+
+        var j = 1;
+        var b = a.a
+        if (b) {
+            j += b.test;
+        }
+        total += j;
+    }
+    print(total)
+}
+
+var a1 = {"a": {"test":1}};
+var a2 = {"a": undefined};
+test(a1)
+test(a2)
+test(a1)
+test(a2)