Alas, mine is the slowest so far...

use warnings;
use strict;
use Benchmark 'cmpthese';
use constant DO_CHECK => 0;
use if DO_CHECK, 'Data::Compare', qw/Compare/;

my @GLOBAL_LIST = -5 .. 5;

cmpthese(-2, {
    sortfirst => sub {
        my @list = @GLOBAL_LIST;
        @list = sort {$a<=>$b} @list;
        @list = ( (grep {$_>=0} @list), (grep {$_<0} @list) );
        DO_CHECK and ( Compare(\@list,[0..5,-5..-1]) or die "@list");
    },
    grepfirst => sub {
        my @list = @GLOBAL_LIST;
        my @pos = grep {$_>=0} @list;
        my @neg = grep {$_<0} @list;
        @list = ( (sort {$a<=>$b} @pos), (sort {$a<=>$b} @neg) );
        DO_CHECK and ( Compare(\@list,[0..5,-5..-1]) or die "@list");
    },
    pryrt => sub {
        my @list = @GLOBAL_LIST;
        sub sgn { $_[0]<0?-1:1 }
        @list = (sort {(sgn($b) <=> sgn($a)) || ($a <=> $b)} @list);
        DO_CHECK and ( Compare(\@list,[0..5,-5..-1]) or die "@list");
    },
    choroba => sub {
        my @in = @GLOBAL_LIST;
        my @sorted = sort {
            ((-1, 0, 1)[$a <=> 0] <=> (-1, 0, 1)[$b <=> 0]) || ($a <=>
+ $b)
        } @in;
        DO_CHECK and ( Compare(\@sorted,[0..5,-5..-1]) or die "@sorted
+");
    }
});
__END__
              Rate     pryrt   choroba grepfirst sortfirst
pryrt      89602/s        --      -26%      -67%      -74%
choroba   120426/s       34%        --      -56%      -65%
grepfirst 271358/s      203%      125%        --      -20%
sortfirst 340119/s      280%      182%       25%        --
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