mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
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/*=============================================================================
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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) 2014 Fredrik Johansson
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******************************************************************************/
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#include "elefun.h"
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static void
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bsplit(fmpz_t P, fmpz_t T, fmpz_t Q, mp_bitcnt_t * Qexp, const fmpz_t x,
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long r, long a, long b, int cont)
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{
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if (b - a == 1)
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{
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fmpz_set(P, x);
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fmpz_set_ui(Q, a + 1);
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*Qexp = r;
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fmpz_set(T, P);
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}
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else
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{
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long m;
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mp_bitcnt_t Q2exp[1];
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fmpz_t P2, Q2, T2;
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m = a + (b - a) / 2;
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fmpz_init(P2);
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fmpz_init(Q2);
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fmpz_init(T2);
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bsplit(P, T, Q, Qexp, x, r, a, m, 1);
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bsplit(P2, T2, Q2, Q2exp, x, r, m, b, 1);
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fmpz_mul(T, T, Q2);
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fmpz_mul_2exp(T, T, *Q2exp);
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fmpz_addmul(T, P, T2);
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fmpz_mul(Q, Q, Q2);
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*Qexp = *Qexp + *Q2exp;
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if (cont)
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fmpz_mul(P, P, P2);
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fmpz_clear(P2);
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fmpz_clear(Q2);
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fmpz_clear(T2);
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}
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}
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void
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elefun_exp_sum_bs_simple(fmpz_t T, fmpz_t Q, mp_bitcnt_t * Qexp,
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const fmpz_t x, mp_bitcnt_t r, long N)
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{
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fmpz_t P;
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fmpz_init(P);
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bsplit(P, T, Q, Qexp, x, r, 0, N, 0);
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fmpz_clear(P);
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}
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