pqc/external/flint-2.4.3/fmpq_poly/pow.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_poly.h"
#include "fmpq_poly.h"
void _fmpq_poly_pow(fmpz * rpoly, fmpz_t rden,
const fmpz * poly, const fmpz_t den, slong len, ulong e)
{
_fmpz_poly_pow(rpoly, poly, len, e);
fmpz_pow_ui(rden, den, e);
}
void fmpq_poly_pow(fmpq_poly_t res, const fmpq_poly_t poly, ulong e)
{
slong len = poly->length, rlen;
if (e == 0)
{
fmpq_poly_set_ui(res, 1);
return;
}
if (len == 0)
{
fmpq_poly_zero(res);
return;
}
rlen = (slong) e * (len - WORD(1)) + WORD(1);
if (res != poly)
{
fmpq_poly_fit_length(res, rlen);
_fmpq_poly_pow(res->coeffs, res->den, poly->coeffs, poly->den, len, e);
_fmpq_poly_set_length(res, rlen);
}
else
{
fmpq_poly_t t;
fmpq_poly_init2(t, rlen);
_fmpq_poly_pow(t->coeffs, t->den, poly->coeffs, poly->den, len, e);
_fmpq_poly_set_length(t, rlen);
fmpq_poly_swap(res, t);
fmpq_poly_clear(t);
}
}