comment on

I'm not sure that example brings any clearence. I'm not the author and I use it as black box. here is little part::

for ($h = 16; $h < 80; $h++) {
    $i[$h] = a2 ($i[$h - 3] ^ $i[$h - 8] ^ $i[$h - 14] ^ $i[$h - 16], 
+1);
}

sub a2 {
    my ($b, $a) = @_;
    
    my $c = $b >> 32 - $a;
    my $e = (1 << 32 - $a) - 1;
    my $d = $b & $e;
    
    return tos($d << $a | $c);
}

sub tos {
    my ($num) = @_;
    $num = $num - 4294967296 if $num > 4294967295;
    $num = $num + 4294967296 if $num < -2147483648;
            
    if ($num >= 0) {
        $num = $num - 2 ** 32 if ($num >> 31);
    }
    return $num;
}
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In reply to Re^2: emulate 32-bit on perl 64 by loofort
in thread emulate 32-bit on perl 64 by loofort

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