diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug674656.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug674656.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+timeout(1);
+function f0(p0) {
+    var v0;
+    var v1;
+    var v2;
+    while (v0) {
+        do {
+            if (p0) {
+                if (v0 ^ p0) {
+                    v1 = v2;
+                    continue;
+                }
+                break;
+            }
+        } while (p0);
+    }
+}
+f0(0);
+
+/* Don't assert */
+