diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/arrayPopShift.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/arrayPopShift.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+
+/* Test pop/shift compiler paths. */
+
+function a() {
+  var x = [];
+  for (var i = 0; i < 50; i++)
+    x.push(i);
+  for (var j = 0; j < 100; j++) {
+    var z = x.shift();
+    if (j < 50)
+      assertEq(z, j);
+    else
+      assertEq(z, undefined);
+  }
+}
+a();
+
+function b() {
+  var x = [];
+  for (var i = 0; i < 50; i++)
+    x.push(i);
+  for (var j = 0; j < 100; j++) {
+    var z = x.pop();
+    if (j < 50)
+      assertEq(z, 49 - j);
+    else
+      assertEq(z, undefined);
+  }
+}
+b();