pqc/external/flint-2.4.3/fmpz_poly/pow_small.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpz_poly.h"
void
_fmpz_poly_pow_small(fmpz * res, const fmpz * poly, slong len, ulong e)
{
switch (e)
{
case 0:
fmpz_one(res);
break;
case 1:
_fmpz_vec_set(res, poly, len);
break;
case 2:
_fmpz_poly_sqr(res, poly, len);
break;
case 3:
{
slong alloc = 2 * len - 1;
fmpz *t = _fmpz_vec_init(alloc);
_fmpz_poly_sqr(t, poly, len);
_fmpz_poly_mul(res, t, alloc, poly, len);
_fmpz_vec_clear(t, alloc);
break;
}
case 4:
{
slong alloc = 2 * len - 1;
fmpz *t = _fmpz_vec_init(alloc);
_fmpz_poly_sqr(t, poly, len);
_fmpz_poly_sqr(res, t, alloc);
_fmpz_vec_clear(t, alloc);
break;
}
}
}