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Plain-C nsumdiff_n function

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Alexander Kruppa 2017-01-30 09:45:33 +01:00
parent 2ce86fbd7e
commit 652854acd3
1 changed files with 69 additions and 0 deletions
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mpn/generic/nsumdiff_n.c Normal file
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/* Copyright 2012 The Code cavern
This file is part of the MPIR Library.
The MPIR 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 2.1 of the License, or (at
your option) any later version.
The MPIR 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 MPIR Library; see the file COPYING.LIB. If not, write
to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "mpir.h"
#include "gmp-impl.h"
mp_limb_t mpn_nsumdiff_n(mp_ptr s, mp_ptr d, mp_srcptr x, mp_srcptr y, mp_size_t n)
{
mp_limb_t ret;
mp_ptr t;
ASSERT_MPN(x, n);
ASSERT_MPN(y, n);
ASSERT(MPN_SAME_OR_SEPARATE_P(s, x, n));
ASSERT(MPN_SAME_OR_SEPARATE_P(s, y, n));
ASSERT(MPN_SAME_OR_SEPARATE_P(d, x, n));
ASSERT(MPN_SAME_OR_SEPARATE_P(d, y, n));
ASSERT(!MPN_OVERLAP_P(s, n, d, n));
if (n == 0)
return 0;
if ((s == x && d == y) || (s == y && d == x))
{
t = __GMP_ALLOCATE_FUNC_LIMBS(n);
ret = mpn_sub_n(t, x, y, n);
ret += 2*mpn_add_n(s, x, y, n);
ret += 2*mpn_neg_n(s, s, n);
MPN_COPY(d, t, n);
__GMP_FREE_FUNC_LIMBS(t, n);
return ret;
}
if (s == x || s == y)
{
ret = mpn_sub_n(d, x, y, n);
ret += 2*mpn_add_n(s, x, y, n);
ret += 2*mpn_neg_n(s, s, n);
return ret;
}
ret = 2*mpn_add_n(s, x, y, n);
ret = 2*mpn_neg_n(s, s, n);
ret += mpn_sub_n(d, x, y, n);
return ret;
}