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#include <tommath.h>
#ifdef BN_MP_DIV_3_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.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
/* divide by three (based on routine from MPI and the GMP manual) */
int mp_div_3(mp_int * a, mp_int * c, mp_digit * d)
{
mp_int q;
mp_word w, t;
mp_digit b;
int res, ix;
/* b = 2**DIGIT_BIT / 3 */
b = word_div_int(((mp_word) 1) << DIGIT_BIT, 3);
if ((res = mp_init_size(&q, a->used)) != MP_OKAY) {
return res;
}
q.used = a->used;
q.sign = a->sign;
w = 0;
for (ix = a->used - 1; ix >= 0; ix--) {
w = (w << ((mp_word) DIGIT_BIT)) | ((mp_word) a->dp[ix]);
if (w >= 3) {
/* multiply w by [1/3] */
t = (w * ((mp_word) b)) >> ((mp_word) DIGIT_BIT);
/* now subtract 3 * [w/3] from w, to get the remainder */
w -= t + t + t;
/* fixup the remainder as required since
* the optimization is not exact.
*/
while (w >= 3) {
t += 1;
w -= 3;
}
} else {
t = 0;
}
q.dp[ix] = (mp_digit) t;
}
/* [optional] store the remainder */
if (d != NULL) {
*d = (mp_digit) w;
}
/* [optional] store the quotient */
if (c != NULL) {
mp_clamp(&q);
mp_exch(&q, c);
}
mp_clear(&q);
return res;
}
#endif
/* $Source: /cvs/libtom/libtommath/bn_mp_div_3.c,v $ */
/* $Revision: 1.4 $ */
/* $Date: 2006/12/28 01:25:13 $ */
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