mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*=============================================================================
|
|
|
|
This file is part of ARB.
|
|
|
|
ARB 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ARB 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 ARB; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2016 Pascal Molin
|
|
|
|
******************************************************************************/
|
|
|
|
#include "dlog.h"
|
|
|
|
ulong
|
|
dlog_crt_init(dlog_crt_t t, ulong a, ulong mod, ulong n, ulong num)
|
|
{
|
|
int k;
|
|
n_factor_t fac;
|
|
ulong * M, * u;
|
|
ulong cost = 0;
|
|
|
|
n_factor_init(&fac);
|
|
n_factor(&fac, n, 1);
|
|
|
|
t->num = fac.num;
|
|
nmod_init(&t->mod,mod);
|
|
nmod_init(&t->n, n);
|
|
|
|
M = t->expo = flint_malloc(t->num * sizeof(ulong));
|
|
u = t->crt_coeffs = flint_malloc(t->num * sizeof(ulong));
|
|
t->pre = flint_malloc(t->num * sizeof(dlog_precomp_t));
|
|
for (k = 0; k < t->num; k++)
|
|
t->pre[k] = flint_malloc(sizeof(dlog_precomp_struct));
|
|
|
|
for (k = 0; k < t->num; k++)
|
|
{
|
|
ulong p, e, mk;
|
|
p = fac.p[k];
|
|
e = fac.exp[k];
|
|
mk = n_pow(p, e);
|
|
M[k] = n / mk;
|
|
u[k] = nmod_mul(M[k], n_invmod(M[k] % mk, mk), t->n);
|
|
/* depends on the power */
|
|
#if 0
|
|
flint_printf("[sub-crt -- init for size %wu mod %wu]\n", mk, mod);
|
|
#endif
|
|
dlog_precomp_pe_init(t->pre[k], nmod_pow_ui(a, M[k], t->mod), mod, p, e, mk, num);
|
|
cost += t->pre[k]->cost;
|
|
}
|
|
#if 0
|
|
if (cost > 500)
|
|
flint_printf("[crt init for size %wu mod %wu -> cost %wu]\n", n,mod,cost);
|
|
#endif
|
|
return cost;
|
|
}
|
|
|
|
void
|
|
dlog_crt_clear(dlog_crt_t t)
|
|
{
|
|
int k;
|
|
flint_free(t->expo);
|
|
flint_free(t->crt_coeffs);
|
|
for (k = 0; k < t->num; k++)
|
|
{
|
|
dlog_precomp_clear(t->pre[k]);
|
|
flint_free(t->pre[k]);
|
|
}
|
|
flint_free(t->pre);
|
|
}
|