1 /* mpn_add_n -- Add two limb vectors of equal, non-zero length.
3 Copyright (C) 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Library General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or (at your
10 option) any later version.
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
15 License for more details.
17 You should have received a copy of the GNU Library General Public License
18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 MA 02111-1307, USA. */
28 mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr, mp_size_t size)
30 mpn_add_n (res_ptr, s1_ptr, s2_ptr, size)
31 register mp_ptr res_ptr;
32 register mp_srcptr s1_ptr;
33 register mp_srcptr s2_ptr;
37 register mp_limb_t x, y, cy;
40 /* The loop counter and index J goes from -SIZE to -1. This way
41 the loop becomes faster. */
44 /* Offset the base pointers to compensate for the negative indices. */
54 y += cy; /* add previous carry to one addend */
55 cy = (y < cy); /* get out carry from that addition */
56 y = x + y; /* add other addend */
57 cy = (y < x) + cy; /* get out carry from that add, combine */