1/* SPARC v9 __mpn_add_n -- Add two limb vectors of the same length > 0 and
2 store sum in a third limb vector.
3
4 Copyright (C) 1995-2024 Free Software Foundation, Inc.
5
6 This file is part of the GNU MP Library.
7
8 The GNU MP Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or (at your
11 option) any later version.
12
13 The GNU MP Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MP Library; see the file COPYING.LIB. If not,
20 see <https://www.gnu.org/licenses/>. */
21
22
23#include <sysdep.h>
24
25
26/* INPUT PARAMETERS
27 res_ptr %o0
28 s1_ptr %o1
29 s2_ptr %o2
30 size %o3 */
31
32
33ENTRY(__mpn_add_n)
34
35 sub %g0,%o3,%g5
36 sllx %o3,3,%g1
37 add %o1,%g1,%o1 ! make s1_ptr point at end
38 add %o2,%g1,%o2 ! make s2_ptr point at end
39 add %o0,%g1,%o0 ! make res_ptr point at end
40 mov 0,%o4 ! clear carry variable
41 sllx %g5,3,%o5 ! compute initial address index
42
431: ldx [%o2+%o5],%g1 ! load s2 limb
44 add %g5,1,%g5 ! increment loop count
45 ldx [%o1+%o5],%o3 ! load s1 limb
46 addcc %g1,%o4,%g1 ! add s2 limb and carry variable
47 movcc %xcc,0,%o4 ! if carry-out, o4 was 1; clear it
48 addcc %g1,%o3,%g1 ! add s1 limb to sum
49 stx %g1,[%o0+%o5] ! store result
50 add %o5,8,%o5 ! increment address index
51 brnz,pt %g5,1b
52 movcs %xcc,1,%o4 ! if s1 add gave carry, record it
53
54 retl
55 mov %o4,%o0
56
57END(__mpn_add_n)
58

source code of glibc/sysdeps/sparc/sparc64/add_n.S