60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*=============================================================================
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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) 2011 Fredrik Johansson
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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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void
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_fmpz_vec_prod(fmpz_t res, const fmpz * vec, slong len)
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{
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if (len <= 1)
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{
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if (len == 1)
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fmpz_set(res, vec);
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else
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fmpz_one(res);
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}
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else if (len <= 3)
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{
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slong i;
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fmpz_mul(res, vec, vec + 1);
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for (i = 2; i < len; i++)
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fmpz_mul(res, res, vec + i);
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}
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else
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{
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slong m = len / 2;
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fmpz_t tmp;
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fmpz_init(tmp);
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_fmpz_vec_prod(res, vec, m);
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_fmpz_vec_prod(tmp, vec + m, len - m);
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fmpz_mul(res, res, tmp);
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fmpz_clear(tmp);
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}
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}
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