mirror of
https://github.com/cc65/cc65.git
synced 2024-06-27 12:29:33 +00:00
53dd513176
which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
55 lines
786 B
ArmAsm
55 lines
786 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 09.06.1998
|
|
;
|
|
; int memcmp (const void* p1, const void* p2, size_t count);
|
|
;
|
|
|
|
.export _memcmp
|
|
.import popax, return0
|
|
.importzp ptr1, ptr2, ptr3
|
|
|
|
_memcmp:
|
|
sta ptr3 ; Save count
|
|
sta ptr3+1
|
|
jsr popax ; get p2
|
|
sta ptr2
|
|
stx ptr2+1
|
|
jsr popax ; get p1
|
|
sta ptr1
|
|
stx ptr1+1
|
|
|
|
ldy #0
|
|
ldx ptr3 ; use X as low counter byte
|
|
beq L3
|
|
|
|
L1: lda (ptr1),y
|
|
cmp (ptr2),y
|
|
bne L5
|
|
iny
|
|
bne L2
|
|
inc ptr1+1
|
|
inc ptr2+1
|
|
L2: txa
|
|
beq L3
|
|
dex
|
|
jmp L1
|
|
L3: lda ptr3+1 ; check high byte
|
|
beq L4
|
|
dec ptr3+1
|
|
dex ; X = $FF
|
|
bne L1 ; branch always
|
|
|
|
; Memory areas are equal
|
|
|
|
L4: jmp return0
|
|
|
|
; Not equal, check which one is greater
|
|
|
|
L5: bcs L6
|
|
ldx #$FF
|
|
rts
|
|
|
|
L6: ldx #$01
|
|
rts
|
|
|