diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug669575-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug669575-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+function loopy(p0)
+{
+ var r1 = p0;
+ var r2 = p0;
+ var r3 = p0;
+ var r4 = p0;
+ var r5 = p0;
+ var r6 = p0;
+ var r7 = p0;
+
+ while (r2) {
+  while (r2) {
+   r1 = r4;
+   r5 = r6 & r1;
+   r3 = r4 & r3;
+  }
+  while (r2) {
+   r6 = r2;
+   r3 = r7;
+  }
+ }
+
+ return 0;
+}
+loopy(0);
+
+