diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug463490.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug463490.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+//test no multitrees assert
+function testBug463490() {
+    function f(a, b, d) {
+        for (var i = 0; i < 10; i++) {
+            if (d)
+                b /= 2;
+        }
+        return a + b;
+    }
+    //integer stable loop
+    f(2, 2, false);
+    //double stable loop
+    f(3, 4.5, false);
+    //integer unstable branch
+    f(2, 2, true);
+    return true;
+};
+assertEq(testBug463490(), true);