test/examples/charcodeat-benchmark.js

/*
 * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/**
 * Simple benchmark to measure charCodeAt specialized method performance
 */

var str = "sghjkdsfkjghsdfjkfkjdfkjdfjkdfjkfdjkfdkfldjfhdfpkjdhafgksdjfgldfgjldfkjgdlfjgldkfjgkldfj";
var RESULT1 = 9187;
var RESULT2 = 1496;

function f() {
    var len = str.length;
    var c = 0;
    for (var i = 0; i < len; i++) {
	c += str.charCodeAt(i);
    }
    return c;
}

function bench(res) {
    var d = new Date;
    var sum = 0;
    for (var i = 0; i < 1e6; i++) {
	sum |= f();
    }
    if (sum == res) {
	print("Verified OK"); 
    } else {
	print("Verification failed " + sum + " should be " + res);
    }
    print((new Date - d) + " ms");
}

bench(RESULT1);

print("Replacing charCodeAt... ");

String.prototype.charCodeAt = function() { return 17; }

bench(RESULT2);

print("Done");