1/
2/ Copyright (C) Igor Sysoev
3/ Copyright (C) Nginx, Inc.
4/
5
6
7/  "casa   [%o2] 0x80, %o1, %o0"  and
8/  "casxa  [%o2] 0x80, %o1, %o0"  do the following:
9/
10/       if ([%o2] == %o1) {
11/           swap(%o0, [%o2]);
12/       } else {
13/           %o0 = [%o2];
14/       }
15
16
17/ ngx_atomic_uint_t ngx_casa(ngx_atomic_uint_t set, ngx_atomic_uint_t old,
18/      ngx_atomic_t *lock);
19/
20/ the arguments are passed in the %o0, %o1, %o2
21/ the result is returned in the %o0
22
23        .inline ngx_casa,0
24        casa    [%o2] 0x80, %o1, %o0
25        .end
26
27
28/ ngx_atomic_uint_t ngx_casxa(ngx_atomic_uint_t set, ngx_atomic_uint_t old,
29/      ngx_atomic_t *lock);
30/
31/ the arguments are passed in the %o0, %o1, %o2
32/ the result is returned in the %o0
33
34        .inline ngx_casxa,0
35        casxa   [%o2] 0x80, %o1, %o0
36        .end
37