diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testThinLoopDemote.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testThinLoopDemote.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+function testThinLoopDemote() {
+    function f()
+    {
+        var k = 1;
+        for (var n = 0; n < 4; n++) {
+            k = (k * 10);
+        }
+        return k;
+    }
+    f();
+    return f();
+}
+assertEq(testThinLoopDemote(), 10000);