76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011 Fredrik Johansson
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Copyright (C) 2012 Lina Kulakova
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Copyright (C) 2013 Mike Hansen
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******************************************************************************/
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#ifdef T
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#include "templates.h"
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#include "ulong_extras.h"
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int
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_TEMPLATE(T, poly_is_squarefree) (const TEMPLATE(T, struct) * f, slong len,
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const TEMPLATE(T, ctx_t) ctx)
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{
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TEMPLATE(T, struct) * fd, *g;
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TEMPLATE(T, t) invfd;
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slong dlen;
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int res;
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if (len <= 2)
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return len != 0;
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fd = _TEMPLATE(T, vec_init) (2 * (len - 1), ctx);
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g = fd + len - 1;
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_TEMPLATE(T, poly_derivative) (fd, f, len, ctx);
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dlen = len - 1;
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TEMPLATE(CAP_T, VEC_NORM) (fd, dlen, ctx);
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if (dlen)
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{
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TEMPLATE(T, init) (invfd, ctx);
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TEMPLATE(T, inv) (invfd, fd + (dlen - 1), ctx);
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res = (_TEMPLATE(T, poly_gcd) (g, f, len, fd, dlen, invfd, ctx) == 1);
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TEMPLATE(T, clear) (invfd, ctx);
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}
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else
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res = 0; /* gcd(f, 0) = f, and len(f) > 2 */
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_TEMPLATE(T, vec_clear) (fd, 2 * (len - 1), ctx);
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return res;
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}
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int
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TEMPLATE(T, poly_is_squarefree) (const TEMPLATE(T, poly_t) f,
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const TEMPLATE(T, ctx_t) ctx)
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{
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return _TEMPLATE(T, poly_is_squarefree) (f->coeffs, f->length, ctx);
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}
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#endif
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