pqc/external/flint-2.4.3/nmod_poly/taylor_shift.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) 2012 Fredrik Johansson
******************************************************************************/
#include "flint.h"
#include "nmod_poly.h"
void
_nmod_poly_taylor_shift(mp_ptr poly, mp_limb_t c, slong len, nmod_t mod)
{
if (len < 100 || len > mod.n)
_nmod_poly_taylor_shift_horner(poly, c, len, mod);
else if ((c == 1 || c == mod.n - 1) && len < 1000)
_nmod_poly_taylor_shift_horner(poly, c, len, mod);
else
_nmod_poly_taylor_shift_convolution(poly, c, len, mod);
}
void
nmod_poly_taylor_shift(nmod_poly_t g, const nmod_poly_t f, mp_limb_t c)
{
if (f != g)
nmod_poly_set(g, f);
_nmod_poly_taylor_shift(g->coeffs, c, g->length, g->mod);
}