Since the slowest version is running 646k iterations per second on my machine I think you should probably look elsewhere for ways to improve your code. I would think that the risk of using regex to modify code is not justified by such a very very minimal optimization.

Update: forgot the code the first time ;)

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

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


cmpthese( 10_000_000    , {
    normal    => sub { $self->get_value()  },
    optimized => sub { $self->get_value2() },
    direct    => sub { $self->[0] },
});


exit(0);

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

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

__END__
C:\Perl\test>perl methods_access_599259.pl
               Rate    normal optimized    direct
normal     646454/s        --      -29%      -92%
optimized  915583/s       42%        --      -89%
direct    8532423/s     1220%      832%        --

[download]

___________
Eric Hodges

In reply to Re^6: Unexpected OO accessor benchmarks by eric256
in thread Unexpected OO accessor benchmarks by cLive ;-)

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.