#!/usr/bin/perl -w
# -*- Mode: Perl; tab-width: 4; indent-tabs-mode: nil; -*-
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is Mozilla Automated Testing Code.
#
# The Initial Developer of the Original Code is
# Mozilla Corporation.
# Portions created by the Initial Developer are Copyright (C) 2008
# the Initial Developer. All Rights Reserved.
#
# Contributor(s): Bob Clary <bob@bclary.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

# Calculate a relative speed measurement based on 
# iterating over a simple loop in perl. Print the
# result as millions of iterations per cpu second.

sub mips
{
    my $tries = 3;        # repeat count to get average
    my $m     = 1000000;  # scale to million iterations/second
    my $l     = 10000000; # number of iterations to time
    my $cpu   = 0;        # cpu time accumlator
    my $dummy = 0;        # dummy variable to prevent optimizations
    my $i;
    my $start;
    my $stop;
    my $a;

    for ($a = 0; $a < $tries; ++$a)
    {
        $start = (times)[0];
        for ($i = 0; $i < $l; ++$i)
        {
            $dummy += $i;
        }
        $stop = (times)[0];
        $cpu += $stop - $start;
    }
    $cpu /= $tries;

    print "" . int($l/($cpu*$m)) . "\n";

    return $dummy; # reuse dummy variable
}

mips;