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/* mpn_toom_eval_dgr3_pm1 -- Evaluate a degree 3 polynomial in +1 and -1
Contributed to the GNU project by Niels Möller
THE FUNCTION IN THIS FILE IS INTERNAL WITH A MUTABLE INTERFACE. IT IS ONLY
SAFE TO REACH IT THROUGH DOCUMENTED INTERFACES. IN FACT, IT IS ALMOST
GUARANTEED THAT IT WILL CHANGE OR DISAPPEAR IN A FUTURE GNU MP RELEASE.
Copyright 2009 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MP Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
#include "gmp.h"
#include "gmp-impl.h"
int
mpn_toom_eval_dgr3_pm1 (mp_ptr xp1, mp_ptr xm1,
mp_srcptr xp, mp_size_t n, mp_size_t x3n, mp_ptr tp)
{
int neg;
ASSERT (x3n > 0);
ASSERT (x3n <= n);
xp1[n] = mpn_add_n (xp1, xp, xp + 2*n, n);
tp[n] = mpn_add (tp, xp + n, n, xp + 3*n, x3n);
neg = (mpn_cmp (xp1, tp, n + 1) < 0) ? ~0 : 0;
#if HAVE_NATIVE_mpn_add_n_sub_n
if (neg)
mpn_add_n_sub_n (xp1, xm1, tp, xp1, n + 1);
else
mpn_add_n_sub_n (xp1, xm1, xp1, tp, n + 1);
#else
if (neg)
mpn_sub_n (xm1, tp, xp1, n + 1);
else
mpn_sub_n (xm1, xp1, tp, n + 1);
mpn_add_n (xp1, xp1, tp, n + 1);
#endif
ASSERT (xp1[n] <= 3);
ASSERT (xm1[n] <= 1);
return neg;
}
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