And, alas, another(!) correction. repson points out that with $x=m; $m--; ++$x == $m never happens!
But..., this didn't change the timings:

my $m=3; my $x=$m; my @a=(1..$m,0);
  equaland: 191864.03/s
   mod2and: 178059.54/s
     wheel: 169709.59/s

my $m=3; my $x=$m; my @n=(1..$m,0); my @a=();
equalandix: 111104.23/s
 mod2andix: 118804.00/s
   wheelix: 127501.75/s
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p