bn_mp_get_double.c

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Author : Francois Perrad
Date : 2018-12-28 09:34:02
Hash : 487cbba0
Message : refactor without macro mp_isneg

bn_mp_get_double.c

#include "tommath_private.h"
#ifdef BN_MP_GET_DOUBLE_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.
 *
 * SPDX-License-Identifier: Unlicense
 */

double mp_get_double(const mp_int *a)
{
   int i;
   double d = 0.0, fac = 1.0;
   for (i = 0; i < DIGIT_BIT; ++i) {
      fac *= 2.0;
   }
   for (i = a->used; i --> 0;) {
      d = (d * fac) + (double)DIGIT(a, i);
   }
   return (a->sign == MP_NEG) ? -d : d;
}
#endif

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

kc3-lang/libtommath/bn_mp_get_double.c

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