diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug758181.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug758181.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+function Ld(a) {
+    var sum = 0;
+    for (var d = 5; 0 <= d; d--)
+        sum += a[d];
+    return sum;
+}
+var arr = [0, 1, 2, 3, 4, 5, 6];
+
+for (var i=0; i < 50; i++)
+    assertEq(Ld(arr), 15);
+
+var arr2 = [0, 1, 2, 3];
+assertEq(Ld(arr2), NaN);