diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testIntUnderflow.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testIntUnderflow.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function testIntUnderflow() {
+    // int32_min + 8
+    var ival = -2147483648 + 8;
+    for (var i = 0; i < 30; i++) {
+        ival -= 2;
+    }
+    return (ival > -2147483648);
+}
+assertEq(testIntUnderflow(), false);