#! perl
# Copyright (C) 2001-2007, The Perl Foundation.
# $Id: /mirror/trunk/examples/mops/mops.pl 19826 2007-07-13T12:44:16.196305Z paultcochrane  $

=head1 NAME

examples/mops/mops.c - Calculate M ops/s

=head1 SYNOPSIS

    % perl examples/mops/mops.pl

=head1 DESCRIPTION

A Perl implementation of the F<examples/mops/mops.pasm> example program,
for speed comparisons.

Calculates a value for M ops/s (million operations per second) using
integer arithmetic.

Prints out:

=over 4

=item * the number of look iterations,

=item * the estimated number of ops performed,

=item * the elapsed time, and

=item * the number of M op/s.

=back

=cut

use strict;
use warnings;

use vars qw( $I1 $I2 $I3 $I4 $I5 $N1 $N2 $N5 );

sub time_hires { return time() }

$I2 = 0;            # set    I2, 0
$I3 = 1;            # set    I3, 1
$I4 = 100000000;    # set    I4, 100000000
                    #
print "Iterations:    $I4\n";    # print  "Iterations:    "
                                 # print  I4
                                 # print  "\n"
                                 #
$I1 = 2;                         # set    I1, 2
$I5 = $I4 * $I1;                 # mul    I5, I4, I1
                                 #
print "Estimated ops: $I5\n";    # print  "Estimated ops: "
                                 # print  I5
                                 # print  "\n"
                                 #
$N1 = time_hires();              # time N1
                                 #
REDO:                            # REDO:
$I4 = $I4 - $I3;                 # sub    I4, I4, I3
goto REDO if $I4;                # if     I4, REDO
                                 #
DONE:                            # DONE:
$N5 = time_hires();              # time   N5
                                 #
$N2 = $N5 - $N1;                 # sub    N2, N5, N1
                                 #
print "Elapsed time:  $N2\n";    # print  "Elapsed time:  "
                                 # print  N2
                                 # print  "\n"
                                 #
$N1 = $I5;                       # iton   N1, I5
$N1 = $N1 / $N2;                 # div    N1, N1, N2
$N2 = 1000000.0;                 # set    N2, 1000000.0
$N1 = $N1 / $N2;                 # div    N1, N1, N2
                                 #
print "M op/s:        $N1\n";    # print  "M op/s:        "
                                 # print  N1
                                 # print  "\n"
                                 #
exit(0);                         # end

=head1 SEE ALSO

F<examples/benchmarks/mops.pasm>,
F<examples/mops/mops.c>,
F<examples/mops/mops.cs>,
F<examples/mops/mops.il>,
F<examples/mops/mops.p6>,
F<examples/mops/mops.ps>,
F<examples/mops/mops.py>,
F<examples/mops/mops.rb>,
F<examples/mops/mops.scheme>.

=cut

# Local Variables:
#   mode: cperl
#   cperl-indent-level: 4
#   fill-column: 100
# End:
# vim: expandtab shiftwidth=4:
