pqc/external/flint-2.4.3/padic_poly/canonicalise.c
2014-05-24 23:16:06 +02:00

55 lines
1.7 KiB
C

/*============================================================================
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) 2011 Sebastian Pancratz
******************************************************************************/
#include "padic_poly.h"
void _padic_poly_canonicalise(fmpz *poly, slong *v, slong len, const fmpz_t p)
{
const slong min = _fmpz_vec_ord_p(poly, len, p);
if (min == 0)
{
if (_fmpz_vec_is_zero(poly, len))
*v = 0;
}
else /* min > 0 */
{
fmpz_t pow;
fmpz_init(pow);
fmpz_pow_ui(pow, p, min);
_fmpz_vec_scalar_divexact_fmpz(poly, poly, len, pow);
fmpz_clear(pow);
*v += min;
}
}
void padic_poly_canonicalise(padic_poly_t poly, const fmpz_t p)
{
_padic_poly_canonicalise(poly->coeffs, &(poly->val), poly->length, p);
}