diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug643829.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug643829.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function _build_tree() {
+    var $n;
+    var $elems = 20;
+    while (true) {
+        var $tmp18 = $n;
+        var $tmp19 = $elems;
+        var $cmp = ($n | 0) < ($elems | 0);
+        return $cmp;
+    }
+}
+assertEq(_build_tree(), true);
+