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https://github.com/vale981/arb
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54 lines
1.6 KiB
C
54 lines
1.6 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) 2012 Fredrik Johansson
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******************************************************************************/
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#include "fmprb.h"
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static void
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fmprb_fac_ui_bsplit(fmprb_t x, ulong a, ulong b, long prec)
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{
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if (b - a == 1)
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{
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fmprb_set_ui(x, b);
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}
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else
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{
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fmprb_t y;
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long m = a + (b - a) / 2;
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fmprb_init(y);
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fmprb_fac_ui_bsplit(x, a, m, prec);
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fmprb_fac_ui_bsplit(y, m, b, prec);
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fmprb_mul(x, x, y, prec);
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fmprb_clear(y);
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}
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}
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void
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fmprb_fac_ui(fmprb_t x, ulong n, long prec)
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{
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fmprb_fac_ui_bsplit(x, 0, FLINT_MAX(n, 1),
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FMPR_PREC_ADD(prec, FLINT_BIT_COUNT(n)));
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}
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