diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testUndefinedBooleanCmp.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testUndefinedBooleanCmp.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+function testUndefinedBooleanCmp()
+{
+    var t = true, f = false, x = [];
+    for (var i = 0; i < 10; ++i) {
+        x[0] = t == undefined;
+        x[1] = t != undefined;
+        x[2] = t === undefined;
+        x[3] = t !== undefined;
+        x[4] = t < undefined;
+        x[5] = t > undefined;
+        x[6] = t <= undefined;
+        x[7] = t >= undefined;
+        x[8] = f == undefined;
+        x[9] = f != undefined;
+        x[10] = f === undefined;
+        x[11] = f !== undefined;
+        x[12] = f < undefined;
+        x[13] = f > undefined;
+        x[14] = f <= undefined;
+        x[15] = f >= undefined;
+    }
+    return x.join(",");
+}
+assertEq(testUndefinedBooleanCmp(), "false,true,false,true,false,false,false,false,false,true,false,true,false,false,false,false");