diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testDoubleToStr.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testDoubleToStr.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function testDoubleToStr() {
+    var x = 0.0;
+    var y = 5.5;
+    for (var i = 0; i < 200; i++) {
+       x += parseFloat(y.toString());
+    }
+    return x;
+}
+assertEq(testDoubleToStr(), 5.5*200);