diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/doubleArrays.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/doubleArrays.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+
+function testPushConvert() {
+  var x = [];
+  for (var i = 0; i < 10; i++)
+    x.push(i + .5);
+  for (var i = 0; i < 5; i++)
+    x.push(i);
+  var res = 0;
+  for (var i = 0; i < x.length; i++)
+    res += x[i];
+  assertEq(res, 60);
+}
+testPushConvert();
+
+function testArrayInitializer() {
+  var x = [.5,1.5,2.5,3];
+  var res = 0;
+  for (var i = 0; i < x.length; i++)
+    res += x[i];
+  assertEq(res, 7.5);
+}
+for (var i = 0; i < 5; i++)
+  testArrayInitializer();
+
+function testArrayConstructor() {
+  var x = Array(.5,1.5,2.5,3);
+  var res = 0;
+  for (var i = 0; i < x.length; i++)
+    res += x[i];
+  assertEq(res, 7.5);
+}
+for (var i = 0; i < 5; i++)
+  testArrayConstructor();
+
+function addInt(a) {
+  // inhibit ion
+  try {
+    a[0] = 10;
+  } catch (e) {}
+}
+
+function testBaseline() {
+  var x = Array(.5,1.5,2.5,3);
+  addInt(x);
+  var res = 0;
+  for (var i = 0; i < x.length; i++)
+    res += x[i];
+  assertEq(res, 17);
+}
+for (var i = 0; i < 5; i++)
+  testBaseline();