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https://github.com/vale981/arb
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31 lines
878 B
C
31 lines
878 B
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(const dlog_crt_t t, ulong b)
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{
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int k;
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ulong r = 0;
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for (k = 0; k < t->num; k++)
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{
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ulong bk, rk;
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bk = nmod_pow_ui(b, t->expo[k], t->mod);
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rk = dlog_precomp(t->pre + k, bk);
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#if 0
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flint_printf("##[crt-%d]: log(%wu)=log(%wu^%wu) = %wu [size %wu mod %wu]\n",
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k, bk, b, t->expo[k], rk, t->n/t->expo[k], t->mod);
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#endif
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r = nmod_add(r, nmod_mul(t->crt_coeffs[k], rk, t->n), t->n);
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}
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return r;
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}
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