bn_mp_tc_div_2d.c

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Author : Daniel Mendler
Date : 2018-09-10 18:48:58
Hash : eebbcf06
Message : add mp_complement, mp_tc_div_2d, mp_tc_and, mp_tc_or, mp_tc_xor

bn_mp_tc_div_2d.c

#include "tommath_private.h"
#ifdef BN_MP_TC_DIV_2D_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
 *
 * LibTomMath is a library that provides multiple-precision
 * integer arithmetic as well as number theoretic functionality.
 *
 * The library was designed directly after the MPI library by
 * Michael Fromberger but has been written from scratch with
 * additional optimizations in place.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */

/* two complement right shift */
int mp_tc_div_2d(const mp_int *a, int b, mp_int *c)
{
  int res;
  if (!mp_isneg(a)) {
    return mp_div_2d(a, b, c, 0);
  }

  res = mp_add_d(a, 1, c);
  if (res != MP_OKAY) {
    return res;
  }

  res = mp_div_2d(c, b, c, 0);
  return res == MP_OKAY ? mp_sub_d(c, 1, c) : res;
}
#endif

/* ref:         $Format:%D$ */
/* git commit:  $Format:%H$ */
/* commit time: $Format:%ai$ */

kc3-lang/libtommath/bn_mp_tc_div_2d.c

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