mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
86 lines
2.2 KiB
C
86 lines
2.2 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_bin_ui_bsplit(fmprb_t P, fmprb_t Q,
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const fmprb_t n, ulong a, ulong b, ulong k, long prec)
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{
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if (b - a == 1)
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{
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fmprb_sub_ui(P, n, k - b, prec);
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fmprb_set_ui(Q, b);
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}
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else
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{
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fmprb_t R, S;
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long m = a + (b - a) / 2;
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fmprb_init(R);
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fmprb_init(S);
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fmprb_bin_ui_bsplit(P, Q, n, a, m, k, prec);
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fmprb_bin_ui_bsplit(R, S, n, m, b, k, prec);
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fmprb_mul(P, P, R, prec);
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fmprb_mul(Q, Q, S, prec);
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fmprb_clear(R);
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fmprb_clear(S);
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}
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}
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void
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fmprb_bin_ui(fmprb_t x, const fmprb_t n, ulong k, long prec)
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{
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if (k == 0)
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{
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fmprb_set_ui(x, 1UL);
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}
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else
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{
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fmprb_t P, Q;
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fmprb_init(P);
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fmprb_init(Q);
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fmprb_bin_ui_bsplit(P, Q, n, 0, k, k, prec + FLINT_BIT_COUNT(k));
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fmprb_div(x, P, Q, prec);
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fmprb_clear(P);
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fmprb_clear(Q);
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}
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}
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void
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fmprb_bin_uiui(fmprb_t x, ulong n, ulong k, long prec)
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{
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fmprb_t t;
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fmprb_init(t);
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fmprb_set_ui(t, n);
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fmprb_bin_ui(x, t, k, prec);
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fmprb_clear(t);
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}
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