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/* mpfr-mini-gmp.c -- Interface functions for mini-gmp.
Copyright 2014-2015 Free Software Foundation, Inc.
Contributed by the AriC and Caramel projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MPFR Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
/* The following include will do 2 things: include the config.h
if there is one (as it may define MPFR_USE_MINI_GMP), and avoid
an empty translation unit (see ISO C99, 6.9). */
#include "mpfr-impl.h"
#ifdef MPFR_USE_MINI_GMP
#include "mpfr-mini-gmp.h"
#ifdef WANT_gmp_randinit_default
void
gmp_randinit_default (gmp_randstate_t state)
{
}
#endif
#ifdef WANT_gmp_randseed_ui
void
gmp_randseed_ui (gmp_randstate_t state, unsigned long int seed)
{
srand48 (seed);
}
#endif
#ifdef WANT_gmp_randclear
void
gmp_randclear (gmp_randstate_t state)
{
}
#endif
#ifdef WANT_mpn_neg
mp_limb_t
mpn_neg (mp_limb_t *rp, const mp_limb_t *sp, mp_size_t n)
{
mp_size_t i;
for (i = 0; i < n; i++)
rp[i] = ~sp[i];
/* the return value of mpn_neg is the borrow as if we subtracted
{sp, n} from {0, n}, i.e., it is always 1 unless {sp, n} is zero */
return 1 - mpn_add_1 (rp, rp, n, (mp_limb_t) 1);
}
#endif
#ifdef WANT_mpn_com
mp_limb_t
mpn_com (mp_limb_t *rp, const mp_limb_t *sp, mp_size_t n)
{
mp_size_t i;
for (i = 0; i < n; i++)
rp[i] = ~sp[i];
}
#endif
#ifdef WANT_mpn_divrem_1
mp_limb_t
mpn_divrem_1 (mp_limb_t *qp, mp_size_t qxn, mp_limb_t *np, mp_size_t nn,
mp_limb_t d0)
{
mpz_t q, r, n, d;
mp_limb_t ret, dd[1];
d->_mp_d = dd;
d->_mp_d[0] = d0;
d->_mp_size = 1;
mpz_init (q);
mpz_init (r);
if (qxn == 0)
{
n->_mp_d = np;
n->_mp_size = nn;
}
else
{
mpz_init2 (n, (nn + qxn) * GMP_NUMB_BITS);
mpn_copyi (n->_mp_d + qxn, np, nn);
mpn_zero (n->_mp_d, qxn);
n->_mp_size = nn + qxn;
}
mpz_tdiv_qr (q, r, n, d);
if (q->_mp_size > 0)
mpn_copyi (qp, q->_mp_d, q->_mp_size);
if (q->_mp_size < nn + qxn)
mpn_zero (qp + q->_mp_size, nn + qxn - q->_mp_size);
ret = (r->_mp_size == 1) ? r->_mp_d[0] : 0;
mpz_clear (q);
mpz_clear (r);
if (qxn != 0)
mpz_clear (n);
return ret;
}
#endif
static mp_limb_t
random_limb (void)
{
#if GMP_NUMB_BITS == 32
return lrand48 ();
#else
return (((mp_limb_t) lrand48 ()) << 32) + lrand48 ();
#endif
}
#ifdef WANT_mpz_urandomb
void
mpz_urandomb (mpz_t rop, gmp_randstate_t state, mp_bitcnt_t nbits)
{
unsigned long n, i;
mpz_realloc2 (rop, nbits);
n = (nbits - 1) / GMP_NUMB_BITS + 1; /* number of limbs */
for (i = n; i-- > 0;)
rop->_mp_d[i] = random_limb ();
i = n * GMP_NUMB_BITS - nbits;
/* mask the upper i bits */
if (i)
rop->_mp_d[n-1] = (rop->_mp_d[n-1] << i) >> i;
while (n > 0 && (rop->_mp_d[n-1] == 0))
n--;
rop->_mp_size = n;
}
#endif
#ifdef WANT_gmp_urandomm_ui
unsigned long
gmp_urandomm_ui (gmp_randstate_t state, unsigned long n)
{
return random_limb () % n;
}
#endif
#ifdef WANT_gmp_urandomb_ui
unsigned long
gmp_urandomb_ui (gmp_randstate_t state, unsigned long n)
{
return random_limb () % (1UL << n);
}
#endif
#ifdef WANT_mpn_divrem
mp_limb_t
mpn_divrem (mp_limb_t *qp, mp_size_t qn, mp_limb_t *np,
mp_size_t nn, const mp_limb_t *dp, mp_size_t dn)
{
mpz_t q, r, n, d;
mp_limb_t ret;
MPFR_ASSERTN(qn == 0);
qn = nn - dn;
n->_mp_d = np;
n->_mp_size = nn;
d->_mp_d = (mp_limb_t*) dp;
d->_mp_size = dn;
mpz_init (q);
mpz_init (r);
mpz_tdiv_qr (q, r, n, d);
MPFR_ASSERTN(q->_mp_size == qn || q->_mp_size == qn + 1);
mpn_copyi (qp, q->_mp_d, qn);
ret = (q->_mp_size == qn) ? 0 : q->_mp_d[qn];
if (r->_mp_size > 0)
mpn_copyi (np, r->_mp_d, r->_mp_size);
if (r->_mp_size < dn)
mpn_zero (np + r->_mp_size, dn - r->_mp_size);
mpz_clear (q);
mpz_clear (r);
return ret;
}
#endif
#ifdef WANT_mpn_tdiv_qr
void
mpn_tdiv_qr (mp_limb_t *qp, mp_limb_t *rp, mp_size_t qxn,
const mp_limb_t *np, mp_size_t nn,
const mp_limb_t *dp, mp_size_t dn)
{
mpz_t q, r, n, d;
MPFR_ASSERTN(qxn == 0);
n->_mp_d = (mp_limb_t*) np;
n->_mp_size = nn;
d->_mp_d = (mp_limb_t*) dp;
d->_mp_size = dn;
mpz_init (q);
mpz_init (r);
mpz_tdiv_qr (q, r, n, d);
MPFR_ASSERTN(q->_mp_size > 0);
mpn_copyi (qp, q->_mp_d, q->_mp_size);
if (q->_mp_size < nn - dn + 1)
mpn_zero (qp + q->_mp_size, nn - dn + 1 - q->_mp_size);
if (r->_mp_size > 0)
mpn_copyi (rp, r->_mp_d, r->_mp_size);
if (r->_mp_size < dn)
mpn_zero (rp + r->_mp_size, dn - r->_mp_size);
mpz_clear (q);
mpz_clear (r);
}
#endif
#ifdef WANT_mpn_sqrtrem
mp_size_t
mpn_sqrtrem (mp_limb_t *sp, mp_limb_t *rp, const mp_limb_t *np, mp_size_t nn)
{
mpz_t s, r, n;
mp_size_t sn = (nn + 1) >> 1, ret;
MPFR_ASSERTN(rp == NULL);
n->_mp_d = (mp_limb_t*) np;
n->_mp_size = nn;
mpz_init (s);
mpz_init (r);
mpz_sqrtrem (s, r, n);
if (s->_mp_size > 0)
mpn_copyi (sp, s->_mp_d, s->_mp_size);
if (s->_mp_size < sn)
mpn_zero (sp + s->_mp_size, sn - s->_mp_size);
ret = r->_mp_size;
mpz_clear (s);
mpz_clear (r);
return ret;
}
#endif
#ifdef WANT_mpz_dump
void
mpz_dump (mpz_t z)
{
mpz_out_str (stdout, 10, z);
putchar ('\n');
}
#endif
#endif /* MPFR_USE_MINI_GMP */
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