#include "tommath_private.h"

#ifdef BN_MP_COUNT_BITS_C

/* LibTomMath, multiple-precision integer library -- Tom St Denis */

/* SPDX-License-Identifier: Unlicense */

/* returns the number of bits in an int */

int mp_count_bits(const mp_int *a)

{

   int     r;

   mp_digit q;

   /* shortcut */

   if (MP_IS_ZERO(a)) {

      return 0;

   }

   /* get number of digits and add that */

   r = (a->used - 1) * MP_DIGIT_BIT;

   /* take the last digit and count the bits in it */

   q = a->dp[a->used - 1];

   while (q > 0u) {

      ++r;

      q >>= 1u;

   }

   return r;

}

#endif