gbdk-2020 | GameBoy Development Kit |
| download: https://git.y1.nz/archives/gbdk.tar.gz | |
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gbdk-lib/libc/asm/sm83/_memcmp.s
1 .module strcmp
2
3 .area _HOME
4
5 ; int memcmp(const void *buf1, const void *buf2, size_t count)
6 _memcmp::
7 lda hl,7(sp)
8 ld a,(hl-)
9 ld b, a
10 ld a,(hl-)
11 ld c, a
12 ld a,(hl-)
13 ld d, a
14 ld a,(hl-)
15 ld e, a
16 ld a,(hl-)
17 ld l,(hl)
18 ld h,a
19
20 inc b
21 inc c
22 jr 3$
23
24 1$:
25 ld a,(de)
26 sub (hl) ; s1[i]==s2[i]?
27 jr nz, 2$ ; -> Different
28
29 inc de
30 inc hl
31 3$:
32 dec c
33 jr nz, 1$
34 dec b
35 jr nz, 1$
36
37 ld de, #0
38 ret
39
40 2$:
41 ld de,#1
42 ret c
43
44 ld de,#-1
45 ret
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