/* 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" /* t = x - y - z or t = x - (y + z) which explains the name */ mp_limb_t mpn_subadd_n(mp_ptr t, mp_srcptr x, mp_srcptr y, mp_srcptr z, mp_size_t n) { mp_limb_t ret; ASSERT(n > 0); ASSERT_MPN(x, n); ASSERT_MPN(y, n); ASSERT_MPN(z, n); ASSERT(MPN_SAME_OR_SEPARATE_P(t, x, n)); ASSERT(MPN_SAME_OR_SEPARATE_P(t, y, n)); ASSERT(MPN_SAME_OR_SEPARATE_P(t, z, n)); if (t == x && t == y && t == z) return mpn_neg(t,z,n); if (t == x && t == y) { ret = mpn_sub_n(t, x, y, n); ret += mpn_sub_n(t, t, z, n); return ret; } if (t == x && t == z) { ret = mpn_sub_n(t, x, z, n); ret += mpn_sub_n(t, t, y, n); return ret; } if (t == y && t == z) { ret = mpn_add_n(t, y, z, n); ret += mpn_sub_n(t, x, t, n); return ret; } if (t == x) { ret = mpn_sub_n(t, x, y, n); ret += mpn_sub_n(t, t, z, n); return ret; } if (t == y) { ret = mpn_sub_n(t, x, y, n); ret += mpn_sub_n(t, t, z, n); return ret; } if (t == z) { ret = mpn_sub_n(t, x, z, n); ret += mpn_sub_n(t, t, y, n); return ret; } ret = mpn_sub_n(t, x, z, n); ret += mpn_sub_n(t, t, y, n); return ret; }