mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
6bf072eb59
This will allow us to not loose the julia session on error. See also https://github.com/wbhart/flint2/pull/243
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
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Copyright (C) 2016 Pascal Molin
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This file is part of Arb.
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Arb is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "dlog.h"
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ulong
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dlog_crt_init(dlog_crt_t t, ulong a, ulong mod, ulong n, ulong num)
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{
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int k;
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n_factor_t fac;
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ulong * M, * u;
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ulong cost = 0;
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n_factor_init(&fac);
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n_factor(&fac, n, 1);
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t->num = fac.num;
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nmod_init(&t->mod,mod);
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nmod_init(&t->n, n);
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M = t->expo = flint_malloc(t->num * sizeof(ulong));
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u = t->crt_coeffs = flint_malloc(t->num * sizeof(ulong));
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t->pre = flint_malloc(t->num * sizeof(dlog_precomp_struct));
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for (k = 0; k < t->num; k++)
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{
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ulong p, e, mk;
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p = fac.p[k];
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e = fac.exp[k];
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if (0 && mod % p == 0)
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{
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flint_printf("dlog_crt_init: modulus must be prime to order.\n");
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flint_abort();
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}
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mk = n_pow(p, e);
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M[k] = n / mk;
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u[k] = nmod_mul(M[k], n_invmod(M[k] % mk, mk), t->n);
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/* depends on the power */
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#if 0
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flint_printf("[sub-crt -- init for size %wu mod %wu]\n", mk, mod);
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#endif
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dlog_precomp_pe_init(t->pre + k, nmod_pow_ui(a, M[k], t->mod), mod, p, e, mk, num);
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cost += t->pre[k].cost;
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}
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#if 0
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if (cost > 500)
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flint_printf("[crt init for size %wu mod %wu -> cost %wu]\n", n,mod,cost);
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#endif
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return cost;
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}
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