The below results show there's no difference between the speed of ++$counter & 1 and ++$counter % 2. I thought there might be but I guess not. Oh well.

use Benchmark qw( cmpthese );
use constant ITERATIONS => 50_000_000;

my $counter = 0;
cmpthese( ITERATIONS,
    {
        and => sub { ++$counter & 1 },
        mod => sub { ++$counter % 2 },
    },
);

__END__


mod 4761905/s   -- -29%
and 6666667/s  40%   --

         Rate  mod  and
mod 4366812/s   -- -21%
and 5524862/s  27%   --

         Rate  mod  and
mod 5524862/s   -- -10%
and 6134969/s  11%   --

         Rate  and  mod
and 6493506/s   -- -29%
mod 9107468/s  40%   --

         Rate  and  mod
and 6250000/s   -- -14%
mod 7288630/s  17%   --

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⠤⠤ ⠙⠊⠕⠞⠁⠇⠑⠧⠊

In reply to &1 is no faster than %2 when checking for oddness. Oh well. by diotalevi

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