diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug750588.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug750588.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// vim: set ts=8 sts=4 et sw=4 tw=99:
+
+function S() {
+  var t = new Float32Array(1);
+  var k = 0;
+  var xx = 19;
+  var gridRes = 64;
+  for (var i = 0; i < 100; i++) {
+      t[k] = -1 + 2 * xx / gridRes;
+  }
+  return t[0];
+}
+assertEq(S(), -0.40625);