pqc/external/flint-2.4.3/fq_poly_factor_templates/is_squarefree.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) 2011 Fredrik Johansson
Copyright (C) 2012 Lina Kulakova
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#ifdef T
#include "templates.h"
#include "ulong_extras.h"
int
_TEMPLATE(T, poly_is_squarefree) (const TEMPLATE(T, struct) * f, slong len,
const TEMPLATE(T, ctx_t) ctx)
{
TEMPLATE(T, struct) * fd, *g;
TEMPLATE(T, t) invfd;
slong dlen;
int res;
if (len <= 2)
return len != 0;
fd = _TEMPLATE(T, vec_init) (2 * (len - 1), ctx);
g = fd + len - 1;
_TEMPLATE(T, poly_derivative) (fd, f, len, ctx);
dlen = len - 1;
TEMPLATE(CAP_T, VEC_NORM) (fd, dlen, ctx);
if (dlen)
{
TEMPLATE(T, init) (invfd, ctx);
TEMPLATE(T, inv) (invfd, fd + (dlen - 1), ctx);
res = (_TEMPLATE(T, poly_gcd) (g, f, len, fd, dlen, invfd, ctx) == 1);
TEMPLATE(T, clear) (invfd, ctx);
}
else
res = 0; /* gcd(f, 0) = f, and len(f) > 2 */
_TEMPLATE(T, vec_clear) (fd, 2 * (len - 1), ctx);
return res;
}
int
TEMPLATE(T, poly_is_squarefree) (const TEMPLATE(T, poly_t) f,
const TEMPLATE(T, ctx_t) ctx)
{
return _TEMPLATE(T, poly_is_squarefree) (f->coeffs, f->length, ctx);
}
#endif