tommath/bn_mp_get_double.c

33 lines
853 B
C
Raw Normal View History

2018-09-10 12:51:26 -04:00
#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.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
double mp_get_double(const mp_int *a)
{
int i;
double d = 0, fac = 1;
for (i = 0; i < DIGIT_BIT; ++i) {
fac *= 2;
}
for (i = USED(a); i --> 0;) {
d = d * fac + (double)DIGIT(a, i);
}
return mp_isneg(a) ? -d : d;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */