diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug678625.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug678625.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+function foldme() {
+    var v0 = 0x7fffffff;
+    var v1 = 1;
+    var v2 = v0 + v1;
+    return v2;
+}
+assertEq(foldme(),2147483648);
+