diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug942550.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug942550.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+function pow(x,y) {
+    return Math.pow(x,y);
+}
+var x = pow(3, -.5);
+var y = pow(3, -.5);
+assertEq(x, y);