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/*
Copyright (C) 2011, 2025 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz.h"
#include "fmpz_vec.h"
void
_fmpz_vec_prod(fmpz_t res, const fmpz * vec, slong len)
{
if (len <= 1)
{
if (len == 1)
fmpz_set(res, vec);
else
fmpz_one(res);
}
else if (len <= 3)
{
slong i;
fmpz_mul(res, vec, vec + 1);
for (i = 2; i < len; i++)
fmpz_mul(res, res, vec + i);
}
else
{
slong m = len / 2;
fmpz_t tmp;
fmpz_init(tmp);
_fmpz_vec_prod(res, vec, m);
_fmpz_vec_prod(tmp, vec + m, len - m);
fmpz_mul(res, res, tmp);
fmpz_clear(tmp);
}
}
void
_fmpz_ui_vec_prod(fmpz_t res, nn_srcptr vec, slong len)
{
if (!len)
fmpz_one(res);
else if (len < 16)
{
slong i;
fmpz_set_ui(res, vec[0]);
for (i = 1; i < len; i++)
fmpz_mul_ui(res, res, vec[i]);
}
else
{
fmpz_t t;
fmpz_init(t);
_fmpz_ui_vec_prod(res, vec, len / 2);
_fmpz_ui_vec_prod(t, vec + len / 2, len - len / 2);
fmpz_mul(res, res, t);
fmpz_clear(t);
}
}