77 lines
2.1 KiB
C
77 lines
2.1 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) 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);
|
|
}
|