diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug720070.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug720070.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+var bytes = [0xff, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]; // big-endian
+bytes.reverse(); // if testing on little-endian
+var result = new Float64Array(new Uint8Array(bytes).buffer)[0];
+
+// Check that this doesn't crash
+isNaN(result + 0);