65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT 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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FLINT 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 FLINT; 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) 2008, 2009 William Hart
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******************************************************************************/
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#include <gmp.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "fmpz_vec.h"
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#include "fmpz_poly.h"
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void
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fmpz_poly_mulhigh_n(fmpz_poly_t res,
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const fmpz_poly_t poly1, const fmpz_poly_t poly2, slong n)
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{
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mp_size_t limbs1 = _fmpz_vec_max_limbs(poly1->coeffs, poly1->length);
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mp_size_t limbs2 = _fmpz_vec_max_limbs(poly2->coeffs, poly2->length);
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mp_size_t len1 = poly1->length;
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mp_size_t len2 = poly2->length;
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mp_size_t limbsx = FLINT_MAX(limbs1, limbs2);
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if (n == 0)
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{
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fmpz_poly_zero(res);
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return;
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}
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if (n < 4)
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{
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fmpz_poly_mulhigh_classical(res, poly1, poly2, n - 1);
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return;
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}
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if ((limbsx > 4) && (n < 16))
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fmpz_poly_mulhigh_karatsuba_n(res, poly1, poly2, n);
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else if (limbs1 + limbs2 <= 8)
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fmpz_poly_mul_KS(res, poly1, poly2);
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else if ((limbs1+limbs2)/2048 > len1 + len2)
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fmpz_poly_mul_KS(res, poly1, poly2);
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else if ((limbs1 + limbs2)*FLINT_BITS*4 < len1 + len2)
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fmpz_poly_mul_KS(res, poly1, poly2);
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else
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fmpz_poly_mul_SS(res, poly1, poly2);
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}
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