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/*
Copyright (C) 2009, 2011 William Hart
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "mpn_extras.h"
mp_limb_t flint_mpn_sumdiff_n(mp_ptr s, mp_ptr d, mp_srcptr x, mp_srcptr y, mp_size_t n)
{
mp_limb_t ret;
mp_ptr t;
if (n == 0)
return 0;
if ((s == x && d == y) || (s == y && d == x))
{
t = (mp_ptr) flint_malloc(n * sizeof(mp_limb_t));
ret = mpn_sub_n(t, x, y, n);
ret += 2 * mpn_add_n(s, x, y, n);
flint_mpn_copyi(d, t, n);
flint_free(t);
return ret;
}
if (s == x || s == y)
{
ret = mpn_sub_n(d, x, y, n);
ret += 2 * mpn_add_n(s, x, y, n);
return ret;
}
ret = 2 * mpn_add_n(s, x, y, n);
ret += mpn_sub_n(d, x, y, n);
return ret;
}