61 lines
1.8 KiB
C
61 lines
1.8 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 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "nmod_poly.h"
|
|
#include "mpn_extras.h"
|
|
#include "ulong_extras.h"
|
|
|
|
int
|
|
_nmod_poly_is_squarefree(mp_srcptr f, slong len, nmod_t mod)
|
|
{
|
|
mp_ptr fd, g;
|
|
slong dlen;
|
|
int res;
|
|
|
|
if (len <= 2)
|
|
return len != 0;
|
|
|
|
fd = flint_malloc(sizeof(mp_limb_t) * 2 * (len - 1));
|
|
g = fd + len - 1;
|
|
|
|
_nmod_poly_derivative(fd, f, len, mod);
|
|
dlen = len - 1;
|
|
MPN_NORM(fd, dlen);
|
|
|
|
if (dlen)
|
|
res = (_nmod_poly_gcd(g, f, len, fd, dlen, mod) == 1);
|
|
else
|
|
res = 0; /* gcd(f, 0) = f, and len(f) > 2 */
|
|
|
|
flint_free(fd);
|
|
return res;
|
|
}
|
|
|
|
int
|
|
nmod_poly_is_squarefree(const nmod_poly_t f)
|
|
{
|
|
return _nmod_poly_is_squarefree(f->coeffs, f->length, f->mod);
|
|
}
|