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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
#if defined __thumb__
#include "../../string/memcmp.c"
#else
#include <string.h>
#include "xscale.h"
int
memcmp (const void *s1, const void *s2, size_t len)
{
int result;
asm (
#ifndef __OPTIMIZE_SIZE__
"
cmp %2, #0x3
bls 6f
and r2, %0, #0x3
and r3, %1, #0x3
cmp r2, r3
bne 6f
mov lr, %0
mov r4, %1
cmp r2, #0x0
beq 3f
b 1f
0:
ldrb r2, [lr], #1 @ zero_extendqisi2
" PRELOADSTR("lr") "
ldrb r3, [r4], #1 @ zero_extendqisi2
" PRELOADSTR("r4") "
cmp r2, r3
bne 5f
tst lr, #0x3
beq 3f
1:
sub %2, %2, #1
cmn %2, #0x1
bne 0b
b 4f
0:
cmp %2, #0x7
bls 3f
ldmia lr,{r2, r3}
ldmia r4,{r5, r6}
sub %2, %2, #0x4
cmp r2, r5
bne 1f
sub %2, %2, #0x4
add lr, lr, #0x4
add r4, r4, #0x4
cmp r3, r6
beq 0b
1:
add %2, %2, #0x4
sub %0, lr, #0x4
sub %1, r4, #0x4
b 6f
3:
cmp %2, #0x3
bls 1f
ldr r2, [lr], #4
ldr r3, [r4], #4
sub %2, %2, #4
cmp r2, r3
bne 1f
0:
cmp %2, #0x3
bls 1f
ldr r2, [lr], #4
" PRELOADSTR("lr") "
ldr r3, [r4], #4
" PRELOADSTR("r4") "
sub %2, %2, #4
cmp r2, r3
beq 0b
1:
sub %0, lr, #0x4
sub %1, r4, #0x4
add %2, %2, #4
"
#endif /* !__OPTIMIZE_SIZE__ */
"
6:
sub %2, %2, #1
cmn %2, #0x1
beq 4f
0:
ldrb r2, [%0], #1 @ zero_extendqisi2
" PRELOADSTR("%0") "
ldrb r3, [%1], #1 @ zero_extendqisi2
" PRELOADSTR("%1") "
cmp r2, r3
bne 5f
sub %2, %2, #1
cmn %2, #0x1
bne 0b
4:
mov r3, r2
5:
rsb %0, r3, r2"
: "=r" (result), "=&r" (s2), "=&r" (len)
: "0" (s1), "1" (s2), "2" (len)
: "r2", "r3", "r4", "r5", "r6", "cc", "lr");
return result;
}
#endif
|
