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  1. or download this
    my $firstbit = ($longsize * 8) - 1;
my $firstbit_mask = 1 << $firstbit;
  2. or download this
    use constant NUM_BITS = $Config{ivsize} * 8;
use constant SIGN_BIT = 1 << ( NUM_BITS - 1 );
...
      return $p >> $q;
   }
}
  3. or download this
    Shift 10101111...10101100 by 3

...
   | 11100000...00000000
     -------------------
     11110101111...10101