if you need a really fast way, you might create an array with 256 entries, in which every possible entry aka byte points to an array of the set bits in it:

my @SetBits= ( [], [0], [1], [0,1], [2], [0,2],
  [1,2], [3], [0,3] ...

...

sub findsetbits { #feed with array of bytes
  my @result;
  my $offset=0;
  foreach my $byte (@_) {
    foreach (@{$SetBits[$byte]}) {
      push @result, $_+$offset;
    }
    $offset+= 8;
  }
  return @result;
}

[download]

(Untested)

In reply to Re: Working with BIG binary fields by jethro
in thread Working with BIG binary fields by juju

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