mirror of
https://github.com/vale981/arb
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83 lines
2.5 KiB
C
83 lines
2.5 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 "arb_poly.h"
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#define BLOCK_CUTOFF 16
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void
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_arb_poly_mullow(arb_ptr res,
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arb_srcptr poly1, slong len1,
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arb_srcptr poly2, slong len2, slong n, slong prec)
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{
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if (n == 1)
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{
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arb_mul(res, poly1, poly2, prec);
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}
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else
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{
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if (n < BLOCK_CUTOFF || len1 < BLOCK_CUTOFF || len2 < BLOCK_CUTOFF)
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_arb_poly_mullow_classical(res, poly1, len1, poly2, len2, n, prec);
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else
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_arb_poly_mullow_block(res, poly1, len1, poly2, len2, n, prec);
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}
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}
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void
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arb_poly_mullow(arb_poly_t res, const arb_poly_t poly1,
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const arb_poly_t poly2,
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slong n, slong prec)
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{
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slong len_out;
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if (poly1->length == 0 || poly2->length == 0 || n == 0)
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{
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arb_poly_zero(res);
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return;
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}
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len_out = poly1->length + poly2->length - 1;
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if (n > len_out)
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n = len_out;
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if (res == poly1 || res == poly2)
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{
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arb_poly_t t;
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arb_poly_init2(t, n);
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_arb_poly_mullow(t->coeffs, poly1->coeffs, poly1->length,
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poly2->coeffs, poly2->length, n, prec);
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arb_poly_swap(res, t);
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arb_poly_clear(t);
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}
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else
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{
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arb_poly_fit_length(res, n);
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_arb_poly_mullow(res->coeffs, poly1->coeffs, poly1->length,
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poly2->coeffs, poly2->length, n, prec);
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}
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_arb_poly_set_length(res, n);
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_arb_poly_normalise(res);
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}
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