mirror of
https://github.com/vale981/arb
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53 lines
1.2 KiB
C
53 lines
1.2 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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/* group components up to bound and return cofactor */
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void
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dlog_n_factor_group(n_factor_t * fac, ulong bound)
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{
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int i, j, k;
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ulong m[FLINT_MAX_FACTORS_IN_LIMB];
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ulong c = 1;
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i = 0;
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for (k = fac->num - 1; k >= 0; k--)
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{
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ulong qe = n_pow(fac->p[k], fac->exp[k]);
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if (qe > bound)
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c *= qe;
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else
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{
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/* try to insert somewhere in m */
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for (j = 0; j < i && (m[j] * qe > bound); j++);
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if (j == i)
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m[i++] = qe;
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else
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m[j] *= qe;
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}
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}
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for (j = 0; j < i; j++)
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{
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fac->p[j] = m[j];
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fac->exp[j] = DLOG_G_SMALL;
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}
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if (c > 1)
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{
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fac->p[i] = c;
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fac->exp[i] = DLOG_G_BIG;
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i++;
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}
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fac->num = i;
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}
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