mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
87 lines
2.4 KiB
C
87 lines
2.4 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) 2013 Fredrik Johansson
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******************************************************************************/
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#include "fmpcb_poly.h"
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void
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_fmpcb_poly_evaluate2_horner(fmpcb_t y, fmpcb_t z, fmpcb_srcptr poly,
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long len, const fmpcb_t x, long prec)
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{
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if (len == 0)
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{
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fmpcb_zero(y);
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fmpcb_zero(z);
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}
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else if (len == 1)
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{
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fmpcb_set_round(y, poly + 0, prec);
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fmpcb_zero(z);
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}
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else if (fmpcb_is_zero(x))
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{
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fmpcb_set_round(y, poly + 0, prec);
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fmpcb_set_round(z, poly + 1, prec);
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}
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else if (len == 2)
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{
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fmpcb_mul(y, x, poly + 1, prec);
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fmpcb_add(y, y, poly + 0, prec);
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fmpcb_set_round(z, poly + 1, prec);
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}
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else
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{
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fmpcb_t t, u, v;
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long i;
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fmpcb_init(t);
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fmpcb_init(u);
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fmpcb_init(v);
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fmpcb_set_round(u, poly + len - 1, prec);
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fmpcb_zero(v);
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for (i = len - 2; i >= 0; i--)
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{
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fmpcb_mul(t, v, x, prec);
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fmpcb_add(v, u, t, prec);
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fmpcb_mul(t, u, x, prec);
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fmpcb_add(u, t, poly + i, prec);
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}
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fmpcb_swap(y, u);
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fmpcb_swap(z, v);
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fmpcb_clear(t);
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fmpcb_clear(u);
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fmpcb_clear(v);
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}
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}
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void
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fmpcb_poly_evaluate2_horner(fmpcb_t r, fmpcb_t s, const fmpcb_poly_t f, const fmpcb_t a, long prec)
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{
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_fmpcb_poly_evaluate2_horner(r, s, f->coeffs, f->length, a, prec);
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}
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