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my ($min, $max, $mid)= (0, 62);
while ($min < $max) {
...
  if ($n < (1 << $mid)) { $max= $mid-1; }
  else { $min= $mid; }
}

if ($n < 0x100000000) {
   if ($n <  0x10000) {
...
         if ($n <  8) {
           if ($n< 4) {
             return $n < 2? 1 : 2;