diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/testSubtract.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/testSubtract.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// vim: set ts=8 sts=4 et sw=4 tw=99:
+function f_int(x, y) {
+    return x - y;
+}
+function f_double(x, y) {
+    return x - y;
+}
+
+for (var i = 0; i < 1000; i++) {
+    assertEq(f_int(5, 3), 2);
+    assertEq(f_int(3, 5), -2);
+    assertEq(f_int(-2147483648, 1), -2147483649);
+}
+
+
+for (var i = 0; i < 1000; i++) {
+    assertEq(f_double(5.5, 3.2), 2.3);
+    assertEq(f_double(2.5, 3.0), -0.5);
+}
+