This looks really weird (excuse the hacked OO - for demo purposes only :)

#!/usr/bin/perl
use strict;
use warnings;
use Benchmark 'cmpthese';

my $self = bless [123], '::main';

cmpthese( 10000000, {
    normal    => $self->a(),
    optimized => $self->b(),
    direct    => $self->c(),
});

exit(0);

sub a {
    # old school accessor
    $self->get_value();
}

sub b {
    # optimized accessor
    $self->get_value2();
}

sub c {
    # fast and nasty, non oo accessor
    $self->[0];
}

sub get_value {
    my $self = shift;
    return $self->[0];
}

sub get_value2 {
    $_[0]->[0];
}

[download]

You would expect the direct method to benchmark fastest, but I got this: 

                Rate optimized    direct    normal
optimized 12549020/s        --       -1%       -1%
direct    12673267/s        1%        --        0%
normal    12673267/s        1%        0%        --

[download]

Am I missing something, or is that just plain weird?

In reply to Unexpected OO accessor benchmarks by cLive ;-)

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