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/*=============================================================================
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"
void
_fmpz_poly_reverse(fmpz * res, const fmpz * poly, slong len, slong n)
{
if (res == poly)
{
slong i;
for (i = 0; i < n / 2; i++)
{
fmpz t = res[i];
res[i] = res[n - 1 - i];
res[n - 1 - i] = t;
}
for (i = 0; i < n - len; i++)
fmpz_zero(res + i);
}
else
{
slong i;
for (i = 0; i < n - len; i++)
fmpz_zero(res + i);
for (i = 0; i < len; i++)
fmpz_set(res + (n - len) + i, poly + (len - 1) - i);
}
}
void
fmpz_poly_reverse(fmpz_poly_t res, const fmpz_poly_t poly, slong n)
{
slong len = FLINT_MIN(n, poly->length);
if (len == 0)
{
fmpz_poly_zero(res);
return;
}
fmpz_poly_fit_length(res, n);
_fmpz_poly_reverse(res->coeffs, poly->coeffs, len, n);
_fmpz_poly_set_length(res, n);
_fmpz_poly_normalise(res);
}
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