mirror of
https://github.com/vale981/arb
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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*=============================================================================
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2016 Pascal Molin
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******************************************************************************/
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#include "acb_dirichlet.h"
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#include "padic.h"
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typedef struct
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{
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ulong p;
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padic_ctx_t ctx; /* padic context */
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padic_t invlog;
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}
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dlog_1modpe_struct;
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typedef dlog_1modpe_struct dlog_1modpe_t[1];
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void
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dlog_1modpe_init(dlog_1modpe_t t, ulong a1, ulong p, ulong e)
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{
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fmpz_t tmp;
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t->p = p;
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fmpz_init(tmp);
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padic_init(t->invlog);
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fmpz_set_ui(tmp, p);
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padic_ctx_init(t->ctx , tmp , 0 , e, PADIC_TERSE);
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padic_set_ui(t->invlog, a1, t->ctx);
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padic_inv(t->invlog, t->invlog, t->ctx);
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fmpz_clear(tmp);
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}
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void
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dlog_1modpe_clear(dlog_1modpe_t t)
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{
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padic_clear(t->invlog);
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padic_ctx_clear(t->ctx);
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}
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/* assume b = 1 mod p, not checked */
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ulong
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dlog_1modpe(const dlog_1modpe_t t, ulong b)
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{
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padic_t px;
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fmpz_t ix;
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ulong ux;
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padic_init(px);
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fmpz_init(ix);
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padic_set_ui(px, b, t->ctx);
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padic_log(px, px, t->ctx);
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padic_mul(px, px, t->invlog, t->ctx);
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padic_get_fmpz(ix, px, t->ctx);
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ux = fmpz_get_ui(ix);
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padic_clear(px);
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fmpz_clear(ix);
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return ux;
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}
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