diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/test586387.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/test586387.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+function testFloatArray() {
+  var v = new Float32Array(32);
+
+  for (var i = 0; i < v.length; ++i)
+    v[i] = i;
+
+  var t = 0;
+  for (var i = 0; i < v.length; ++i)
+    t += v[i];
+
+  return t;
+}
+
+assertEq(testFloatArray(), 496);