cmpthese -2, {
    for_0   => sub { for_loop( \@match_0 ) },
    for_25  => sub { for_loop( \@match_25 ) },
    for_50  => sub { for_loop( \@match_50 ) },
    for_75  => sub { for_loop( \@match_75 ) },
    for_100 => sub { for_loop( \@match_100 ) },

    grep_0   => sub { grep_loop( \@match_0 ) },
    grep_25  => sub { grep_loop( \@match_25 ) },
    grep_50  => sub { grep_loop( \@match_50 ) },
    grep_75  => sub { grep_loop( \@match_75 ) },
    grep_100 => sub { grep_loop( \@match_100 ) },
    
    fastgrep_0   => sub { fastgrep_loop( \@match_0 ) },
    fastgrep_25  => sub { fastgrep_loop( \@match_25 ) },
    fastgrep_50  => sub { fastgrep_loop( \@match_50 ) },
    fastgrep_75  => sub { fastgrep_loop( \@match_75 ) },
    fastgrep_100 => sub { fastgrep_loop( \@match_100 ) },
    
    noretfor_0   => sub { noretfor_loop( \@match_0 ) },
	noretfor_25   => sub { noretfor_loop( \@match_25 ) },
	noretfor_50   => sub { noretfor_loop( \@match_50 ) },
	noretfor_75   => sub { noretfor_loop( \@match_75 ) },
	noretfor_100   => sub { noretfor_loop( \@match_100 ) },
	
	noretgrep_0   => sub { noretgrep_loop( \@match_0 ) },
	noretgrep_25   => sub { noretgrep_loop( \@match_25 ) },
	noretgrep_50   => sub { noretgrep_loop( \@match_50 ) },
	noretgrep_75   => sub { noretgrep_loop( \@match_75 ) },
	noretgrep_100   => sub { noretgrep_loop( \@match_100 ) },
};

sub for_loop {
	my @matches;
    for ( @{$_[0]} ) {
        push @matches, $_ if /x/;
    }
    return @matches;
}

sub grep_loop {
    my @matches = grep /x/, @{$_[0]};
    return @matches;
}

sub fastgrep_loop {
	return grep /x/, @{$_[0]};
}

sub noretfor_loop {
	for (@{$_[0]}) {
		$_ =~ /x/
	}
}

sub noretgrep_loop {
	grep /x/, @{$_[0]};
}
__END__
(cropped to fit)
               Rate grep_100 grep_75 for_100 grep_50 for_75 for_50 grep_25 for_25 noretfor_75
grep_100      134/s       --    -17%    -29%    -41%   -42%   -55%    -62%   -68%        -79%
grep_75       161/s      20%      --    -15%    -29%   -30%   -47%    -55%   -61%        -75%
for_100       189/s      41%     17%      --    -16%   -18%   -37%    -47%   -55%        -71%
grep_50       226/s      68%     40%     20%      --    -2%   -25%    -36%   -46%        -65%
for_75        231/s      72%     43%     22%      2%     --   -24%    -35%   -45%        -64%
for_50        302/s     125%     87%     60%     33%    31%     --    -15%   -28%        -54%
grep_25       356/s     165%    121%     88%     57%    54%    18%      --   -15%        -45%
for_25        419/s     212%    160%    121%     85%    82%    39%     18%     --        -36%
noretfor_75   650/s     383%    303%    243%    187%   182%   115%     82%    55%          --
noretfor_100  680/s     406%    321%    259%    200%   195%   125%     91%    62%          5%
noretfor_50   693/s     416%    330%    266%    206%   200%   130%     95%    66%          7%
for_0         693/s     416%    330%    266%    206%   200%   130%     95%    66%          7%
noretfor_0    697/s     419%    332%    269%    208%   202%   131%     96%    66%          7%
noretgrep_50  700/s     421%    334%    270%    209%   204%   132%     96%    67%          8%
noretfor_25   701/s     421%    334%    271%    210%   204%   132%     97%    67%          8%
noretgrep_75  736/s     448%    356%    289%    225%   219%   144%    106%    76%         13%
fastgrep_0    740/s     451%    359%    291%    227%   221%   145%    108%    77%         14%
fastgrep_75   747/s     456%    363%    295%    230%   224%   147%    110%    78%         15%
fastgrep_100  752/s     460%    366%    298%    232%   226%   149%    111%    80%         16%
noretgrep_25  769/s     472%    376%    306%    240%   233%   154%    116%    84%         18%
noretgrep_0   769/s     472%    377%    307%    240%   233%   155%    116%    84%         18%
fastgrep_50   777/s     478%    381%    311%    243%   237%   157%    118%    85%         20%
noretgrep_100 781/s     481%    384%    313%    245%   238%   159%    119%    86%         20%
grep_0        796/s     492%    393%    321%    252%   245%   164%    123%    90%         23%
fastgrep_25   801/s     496%    396%    323%    254%   247%   165%    125%    91%         23%