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diff --git a/js/src/tests/js1_8_1/jit/regress-451673.js b/js/src/tests/js1_8_1/jit/regress-451673.js
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+// |reftest| skip -- bogus perf test (bug 540512)
+/* -*- 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 = 451673;
+var summary = 'TM: Tracing prime number generation';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+ enterFunc ('test');
+ printBugNumber(BUGNUMBER);
+ printStatus (summary);
+
+ function doTest(enablejit)
+ {
+ if (enablejit)
+ else
+
+ var n = 1000000;
+ var start = new Date();
+ var i=0;
+ var j=0;
+ var numprimes=0;
+ var limit=0;
+ numprimes = 1; // 2 is prime
+ var mceil = Math.floor;
+ var msqrt = Math.sqrt;
+ var isPrime = 1;
+
+ for (i = 3; i<= n; i+=2)
+ {
+ isPrime=1;
+ limit = mceil(msqrt(i)+1) + 1;
+
+ for (j = 3; j < limit; j+=2)
+ {
+ if (i % j == 0)
+ {
+ isPrime = 0;
+ break;
+ }
+ }
+
+ if (isPrime)
+ {
+ numprimes ++;
+ }
+ }
+
+ var end = new Date();
+
+ var timetaken = end - start;
+ timetaken = timetaken / 1000;
+
+ if (enablejit)
+
+ print((enablejit ? ' JIT' : 'Non-JIT') + ": Number of primes up to: " + n + " is " + numprimes + ", counted in " + timetaken + " secs.");
+
+ return timetaken;
+ }
+
+ var timenonjit = doTest(false);
+ var timejit = doTest(true);
+
+ expect = true;
+ actual = timejit < timenonjit;
+
+ reportCompare(expect, actual, summary);
+
+ exitFunc ('test');
+}