A GRT on packed negativity indicator and value seems to work.

use 5.026;
use warnings;

say for
   map { 
      unpack q{xl>}, $_;
      }
   sort
   map {
      my $neg = $_ < 0 ? 1 : 0;
      pack q{Cl>}, $neg, $_;
      }
   -4 .. 4;

[download]

The output.

0
1
2
3
4
-4
-3
-2
-1

[download]

I hope this is useful.

Update: I just noticed that Tux posted exactly the same method while I was posting this.

Update 2: Ah! Not quite the same, negativity indicator not required apparently.

Cheers,

JohnGG

In reply to Re: Fastest way to sort a list of integers into 0,1,2,3,-3,-2,-1 by johngg
in thread Fastest way to sort a list of integers into 0,1,2,3,-3,-2,-1 by haukex

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