1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/*
* int cas32(u32int *p, u32int ov, u32int nv);
* int cas(uint *p, int ov, int nv);
* int casl(ulong *p, ulong ov, ulong nv);
*/
TEXT cas0(SB), 1, $-4
_cas0:
CLREX
MOVW $0, R0
RETURN
TEXT cas32(SB), 1, $-4
TEXT cas(SB), 1, $-4
TEXT casl(SB), 1, $-4
MOVWU ov+8(FP), R1
MOVWU nv+16(FP), R2
_cas1:
LDXRW (R0), R3
CMP R3, R1
BNE _cas0
STXRW R2, (R0), R4
CBNZ R4, _cas1
MOVW $1, R0
B _barrier(SB)
TEXT casp(SB), 1, $-4
MOV ov+8(FP), R1
MOV nv+16(FP), R2
_casp1:
LDXR (R0), R3
CMP R3, R1
BNE _cas0
STXR R2, (R0), R4
CBNZ R4, _casp1
MOVW $1, R0
B _barrier(SB)
TEXT _xinc(SB), 1, $-4 /* void _xinc(long *); */
TEXT ainc(SB), 1, $-4 /* long ainc(long *); */
spinainc:
LDXRW (R0), R3
ADDW $1,R3
STXRW R3, (R0), R4
CBNZ R4, spinainc
MOVW R3, R0
B _barrier(SB)
TEXT _xdec(SB), 1, $-4 /* long _xdec(long *); */
TEXT adec(SB), 1, $-4 /* long adec(long *); */
spinadec:
LDXRW (R0), R3
SUBW $1,R3
STXRW R3, (R0), R4
CBNZ R4, spinadec
MOVW R3, R0
B _barrier(SB)
|
