[tpm] Is there a three-way version of...

[J. Bobby Lopez]

Yep, chaining is faster, which makes sense.  But figured I'd try to compare
them anyway.

Here are two scripts that I used for comparison:

test1.pl--------------------------------------------------------------

#!/usr/bin/perl -w

use strict;

sub loop
{
    my ($a, $b, $c, $d) = "";
    for my $i (0..300000)
    {
        $a = get(0);
        $b = get(5);
        $c = get(10);
        $d = get(14);

        $a = $b if $a eq "-";
        $a = $c if $a eq "-";
        $a = $d if $a eq "-";
        $a = "empty" if $a eq "-";

        #print "$i - a: $a, b: $b, c: $c, d: $d", "\n";
    }
}

sub get
{
  my $r = 4;
  my ($m) = @_;
  my $a = int(rand($r)) + $m;
  return $a if $a > ($m + $r) - 2;
  return "-";
}
--------------------------------------------------------------

test2.pl--------------------------------------------------------------
#!/usr/bin/perl -w

use strict;

sub loop
{
    my ($a, $b, $c, $d) = "";
    for my $i (0..300000)
    {
        $a = get(0);
        $b = get(5);
        $c = get(10);
        $d = get(14);

        $a = $a || $b || $c || $d || 'empty';

        # print "$i - a: $a, b: $b, c: $c, d: $d", "\n";
    }
}

sub get
{
  my $r = 4;
  my ($m) = @_;
  my $a = int(rand($r)) + $m;
  return $a if $a > ($m + $r) - 2;
  return 0;
}

loop();
--------------------------------------------------------------

Here are the results from the tests ran on the above scripts:

test1.pl
jbl at blopez-d620:~/tmp$ time ./test1.pl

real    0m2.129s
user    0m2.120s
sys    0m0.008s
jbl at blopez-d620:~/tmp$ time ./test1.pl

real    0m2.023s
user    0m2.016s
sys    0m0.004s
jbl at blopez-d620:~/tmp$ time ./test1.pl

real    0m1.983s
user    0m1.976s
sys    0m0.008s

test2.pl
jbl at blopez-d620:~/tmp$ time ./test2.pl

real    0m1.612s
user    0m1.604s
sys    0m0.008s
jbl at blopez-d620:~/tmp$ time ./test2.pl

real    0m1.579s
user    0m1.576s
sys    0m0.004s
jbl at blopez-d620:~/tmp$ time ./test2.pl

real    0m1.625s
user    0m1.612s
sys    0m0.012s



-- 
J. Bobby Lopez
Web: http://jbldata.com/
Twitter: http://www.twitter.com/jbobbylopez
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