diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/inline-doubles.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/inline-doubles.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+function add0_5 (n) {
+    return n + 0.5;
+}
+
+function add1_0 (n) {
+    return n + 1;
+}
+
+function add1_5 (n) {
+    return n + 1.5;
+}
+
+function add2_0 (n) {
+    return n + 2;
+}
+
+function sub2_0 (n) {
+    return n - 2;
+}
+
+
+var num = 1.5;
+
+function main () {
+    for (var i = 0; i < 1000; i++) {
+        assertEq(add0_5(num), 2);
+        assertEq(add1_0(num), 2.5);
+        assertEq(add1_5(num), 3);
+        assertEq(add2_0(num), 3.5);
+        assertEq(sub2_0(num), -0.5);
+    }
+}
+main();