1 /* Add two limb vectors of equal, non-zero length for PowerPC.
2 Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 /* mp_limb_t mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr,
26 Calculate s1+s2 and put result in res_ptr; return carry, 0 or 1. */
28 /* Note on optimisation: This code is optimal for the 601. Almost every other
29 possible 2-unrolled inner loop will not be. Also, watch out for the
32 EALIGN (BP_SYM (__mpn_add_n), 3, 0)
34 #if __BOUNDED_POINTERS__
35 slwi r10,r6,2 /* convert limbs to bytes */
36 CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10)
37 CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10)
38 CHECK_BOUNDS_BOTH_WIDE (r5, r8, r9, r10)
40 /* Set up for loop below. */
47 /* Clear the carry. */
49 /* Adjust pointers for loop. */
63 /* Align start of loop to an odd word boundary to guarantee that the
64 last two words can be fetched in one access (for 601). */
74 /* Return the carry. */
77 END (BP_SYM (__mpn_add_n))