mirror of
https://github.com/vale981/arb
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44 lines
1.5 KiB
C
44 lines
1.5 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 "dlog.h"
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#include "math.h"
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/* we known the order is prime */
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void
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dlog_precomp_p_init(dlog_precomp_t pre, ulong a, ulong mod, ulong p, ulong num)
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{
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if ( p < DLOG_TABLE_P_LIM )
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{
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dlog_precomp_small_init(pre, a, mod, p, num);
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}
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else
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{
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ulong m;
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m = (2 * num < p) ? ceil(sqrt((double) p * num)) : p;
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pre->type = DLOG_BSGS;
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pre->cost = dlog_bsgs_init(pre->t.bsgs, a, mod, p, m);
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}
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}
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