diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug626398.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug626398.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+
+function g(n) {
+  var s;
+  switch (n) {
+    case 0:
+    s = "c"+n;
+    break;
+
+    default:
+    s = "d"+n;
+    break;
+  }
+  return s;
+}
+
+// Do it twice with different initial values for 'i' to allow for 8
+// being even or odd.
+
+var s = "";
+for (let i = 0; i != 30; i+=2) {
+  s += g(i%4/2);
+}
+assertEq(s, "c0d1c0d1c0d1c0d1c0d1c0d1c0d1c0");
+
+var s = "";
+for (let i = 2; i != 30; i+=2) {
+  s += g(i%4/2);
+}
+assertEq(s, "d1c0d1c0d1c0d1c0d1c0d1c0d1c0");
+