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
|
.file "strncmp.S"
.section .text
.global _strncmp
.type _strncmp,@function
_strncmp:
;; R1: string1
;; R2: string2
;; R3: max number of bytes to compare
#ifdef __RX_DISALLOW_STRING_INSNS__
cmp #0, r3 ; For a length of zero, return zero
beq 4f
2: mov.b [r1+], r4
mov.b [r2+], r5
cmp #0, r4
beq 3f
cmp #0, r5
beq 3f
sub #1, r3
beq 3f
cmp r4, r5
beq 2b
3: and #0xff, r4 ; We need to perform an unsigned comparison of the bytes.
and #0xff, r5
sub r5, r4, r1
rts
4: mov #0, r1
rts
#else
scmpu ; Perform the string comparison
bnc 1f ; If Carry is not set skip over
scne.L r1 ; Set result based on Z flag
rts ;
1: ;
mov #-1,r1 ; Carry not set, result should be negative
rts ;
#endif
.size _strncmp, . - _strncmp
|