Apparently, which is slower depends on your version of perl... :-)

Here's the benchmark code I used. Now, it's not entirely fair because I'm not testing with a long list of parameters - Benchmark is going to only pass in a single parameter. However, it's a start. 

#!/usr/bin/perl

sub dest { return 1 } # don't want it optimised away

use Benchmark qw(:all);

cmpthese(-1,
         {
             goto => sub {
                 goto &dest;
             },
             call => sub {
                 return dest(@_);
             },
             callamp => sub {
                 return &dest;
             },
         });

[download]
And the results? They depend on the version of perl. Using just the oldest and newest perls I have: 
$ perl5.8.8 x.pl
             Rate    call callamp    goto
call    4283398/s      --     -9%    -29%
callamp 4693114/s     10%      --    -22%
goto    5996757/s     40%     28%      --
$ perl5.14.1 x.pl
             Rate    call    goto callamp
call    4633858/s      --     -9%    -12%
goto    5119310/s     10%      --     -2%
callamp 5242879/s     13%      2%      --

[download]
Of course, nothing of import is actually happening, the code in the called function will likely completely overwhelm the calling, so (and I'm sure you, ikegami, know this) don't base which one you use on the performance - there is no real significant difference - even the slowest one in perl 5.8.8 only takes 2.3e-7 seconds (on my CPU), which amounts to a couple hundred CPU cycles. Any REAL work you're doing will so completely overwhelm this that the so-called "savings" between calling it one way vs another will be nothing more than noise. Use the one that does what you mean, the maintainers (which likely will include yourself 6+ months from now) will thank you.

In reply to Re^5: how to goto &sysread ? by Tanktalus
in thread how to goto &sysread ? by perl5ever

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