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/* $Id: mpz_misc.C,v 1.7 2005/09/28 18:37:50 dm Exp $ */
/*
*
* Copyright (C) 1998 David Mazieres (dm@uun.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include "bigint.h"
#include "msb.h"
#undef min
#define min(a, b) (((a) < (b)) ? (a) : (b))
size_t
(mpz_sizeinbase2) (const MP_INT *mp)
{
size_t i;
for (i = ABS (mp->_mp_size); i-- > 0;) {
mp_limb_t v;
if ((v = mp->_mp_d[i]))
return 8 * sizeof (mp_limb_t) * i + fls (v);
}
return 0;
}
void
_mpz_fixsize (MP_INT *r)
{
mp_limb_t *sp = r->_mp_d;
mp_limb_t *ep = sp + ABS (r->_mp_size);
while (ep > sp && !ep[-1])
ep--;
r->_mp_size = r->_mp_size < 0 ? sp - ep : ep - sp;
_mpz_assert (r);
}
void
mpz_umod_2exp (MP_INT *r, const MP_INT *a, u_long b)
{
size_t nlimbs;
const mp_limb_t *ap, *ae;
mp_limb_t *rp, *re;
if (a->_mp_size >= 0) {
mpz_tdiv_r_2exp (r, a, b);
return;
}
nlimbs = ((b + (8 * sizeof (mp_limb_t) - 1))
/ (8 * sizeof (mp_limb_t)));
if ((size_t) r->_mp_alloc < nlimbs)
_mpz_realloc (r, nlimbs);
ap = a->_mp_d;
ae = ap + min ((size_t) ABS (a->_mp_size), nlimbs);
rp = r->_mp_d;
while (ap < ae)
if ((*rp++ = -*ap++))
goto nocarry;
r->_mp_size = 0;
return;
nocarry:
while (ap < ae)
*rp++ = ~*ap++;
re = r->_mp_d + nlimbs;
while (rp < re)
*rp++ = ~(mp_limb_t) 0;
re[-1] &= ~(mp_limb_t) 0 >> ((8*sizeof (mp_limb_t) - b)
% (8*sizeof (mp_limb_t)));
r->_mp_size = nlimbs;
_mpz_fixsize (r);
}
int
mpz_getbit (const MP_INT *mp, size_t bit)
{
long limb = bit / mpz_bitsperlimb;
long nlimbs = mp->_mp_size;
if (mp->_mp_size >= 0) {
if (limb >= nlimbs)
return 0;
return mp->_mp_d[limb] >> bit % mpz_bitsperlimb & 1;
}
else {
int carry;
mp_limb_t *p, *e;
nlimbs = -nlimbs;
if (limb >= nlimbs)
return 1;
carry = 1;
p = mp->_mp_d;
e = p + limb;
for (; p < e; p++)
if (*p) {
carry = 0;
break;
}
return (~*e + carry) >> bit % mpz_bitsperlimb & 1;
}
}
#if SIZEOF_LONG < 8
void
mpz_set_u64 (MP_INT *mp, u_int64_t val)
{
if (mp->_mp_alloc * sizeof (mp_limb_t) < 8)
_mpz_realloc (mp, (8 + sizeof (mp_limb_t) - 1) / sizeof (mp_limb_t));
u_int i = 0;
while (val) {
mp->_mp_d[i++] = val;
val >>= 8 * sizeof (mp_limb_t);
}
mp->_mp_size = i;
}
void
mpz_set_s64 (MP_INT *mp, int64_t val)
{
if (val < 0) {
mpz_set_u64 (mp, -val);
mp->_mp_size = -mp->_mp_size;
}
else
mpz_set_u64 (mp, val);
}
u_int64_t
mpz_get_u64 (const MP_INT *mp)
{
int i = ABS (mp->_mp_size);
if (!i)
return 0;
#if GMP_LIMB_SIZE >= 8
u_int64_t ret = mp->_mp_d[0];
#else /* GMP_LIMB_SIZE < 8 */
u_int64_t ret = mp->_mp_d[--i];
while (i > 0)
ret = (ret << 8 * sizeof (mp_limb_t)) | mp->_mp_d[--i];
#endif /* GMP_LIMB_SIZE < 8 */
if (mp->_mp_size > 0)
return ret;
return ~(ret - 1);
}
int64_t
mpz_get_s64 (const MP_INT *mp)
{
int i = ABS (mp->_mp_size);
if (!i)
return 0;
#if GMP_LIMB_SIZE >= 8
int64_t ret = mp->_mp_d[0];
#else /* GMP_LIMB_SIZE < 8 */
int64_t ret = mp->_mp_d[--i];
while (i > 0)
ret = (ret << 8 * sizeof (mp_limb_t)) | mp->_mp_d[--i];
if (mp->_mp_size > 0)
return ret;
#endif /* GMP_LIMB_SIZE < 8 */
return ~(ret - 1);
}
#endif /* SIZEOF_LONG < 8 */
/* To be called from the debugger */
extern "C" void mpz_dump (const MP_INT *);
void
mpz_dump (const MP_INT *mp)
{
char *str = (char *) xmalloc (mpz_sizeinbase (mp, 16) + 3);
mpz_get_str (str, 16, mp);
strcat (str, "\n");
write (2, str, strlen (str));
xfree (str);
}
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