diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-416628.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-416628.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,110 @@
+// |reftest| random -- BigO
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 416628;
+var summary = 'O(n^2) blowup due to overlong cx->tempPool arena list';
+var actual = '';
+var expect = '';
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var data = {X:[], Y:[]};
+
+  Function.prototype.inherits = function(parentCtor) {
+    moo_inherits(this, parentCtor);
+  };
+
+  moo_inherits = function(childCtor, parentCtor) {
+    /** @constructor */
+    function tempCtor() {};
+    tempCtor.prototype = parentCtor.prototype;
+    childCtor.superClass_ = parentCtor.prototype;
+    childCtor.prototype = new tempCtor();
+    childCtor.prototype.constructor = childCtor;
+  };
+
+  var jstart =  100;
+  var jstop  = 1000;
+  var jinterval = (jstop - jstart)/9;
+
+  if (true) { 
+    for (var j = jstart; j < jstop; j += jinterval)
+    {
+      data.X.push(j);
+      var code = '';
+      for (var i = 0; i < j; i++)
+      {
+        code += createCode(i);
+      }
+      gc();
+      var start = new Date();
+      eval(code);
+      var stop = new Date();
+      data.Y.push(stop - start);
+    }
+  }
+
+  var order = BigO(data);
+
+  var msg = '';
+  for (var p = 0; p < data.X.length; p++)
+  {
+    msg += '(' + data.X[p] + ', ' + data.Y[p] + '); ';
+  }
+  printStatus(msg);
+  printStatus('Order: ' + order);
+
+  reportCompare(true, order < 2, 'BigO ' + order + ' < 2');
+
+  exitFunc ('test');
+}
+
+function createCode(i)
+{
+  var code = '';
+
+  code += "var str1_" + i + "='This is 1 a test " + i + " string.';";
+  code += "var str2_" + i + "='This is 2 a test " + i + " string.';";
+  code += "var str3_" + i + "='This is 3 a test " + i + " string.';";
+  code += "var str4_" + i + "='This is 4 a test " + i + " string.';";
+  code += "var str5_" + i + "='This is 5 a test " + i + " string.';";
+  code += "var str6_" + i + "='This is 6 a test " + i + " string.';";
+  code += "var str7_" + i + "='This is 7 a test " + i + " string.';";
+  code += "";
+  code += "var base" + i + " = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".f1 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f2 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f3 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f4 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f5 = function() {this.a_=4;this.b_=5};";
+  code += "";
+  code += "var child" + i + " = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".inherits(base" + i + ");";
+  code += "child" + i + ".f1 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f2 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f3 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f4 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f5 = function() {this.a_=4;this.b_=5};";
+  code += "";
+  code += "var gchild" + i + " = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".inherits(child" + i + ");";
+  code += "gchild" + i + ".f1 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f2 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f3 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f4 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f5 = function() {this.a_=4;this.b_=5};";
+
+  return code;
+}