mirror of
https://github.com/cc65/cc65.git
synced 2024-11-02 18:06:48 +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
63 lines
717 B
ArmAsm
63 lines
717 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 09.12.1998
|
|
;
|
|
; void __fastcall__ _swap (void* p, void* q, size_t size);
|
|
;
|
|
|
|
.export __swap
|
|
.import popax
|
|
.importzp ptr1, ptr2, ptr3
|
|
|
|
|
|
__swap: sta ptr3 ; Save size
|
|
stx ptr3+1
|
|
|
|
jsr popax ; Get q
|
|
sta ptr2
|
|
stx ptr2+1
|
|
|
|
jsr popax ; Get p
|
|
sta ptr1
|
|
stx ptr1+1
|
|
|
|
; Prepare for swap
|
|
|
|
ldy #$00
|
|
|
|
; Swap 256 byte blocks
|
|
|
|
ldx ptr3+1
|
|
beq @L2
|
|
|
|
@L1: lda (ptr1),y
|
|
tax
|
|
lda (ptr2),y
|
|
sta (ptr1),y
|
|
txa
|
|
sta (ptr2),y
|
|
iny
|
|
bne @L1
|
|
dec ptr3+1
|
|
bne @L1
|
|
|
|
; Swap remaining bytes (Y is zero)
|
|
|
|
@L2: ldx ptr3
|
|
beq @L9
|
|
|
|
@L3: lda (ptr1),y
|
|
tax
|
|
lda (ptr2),y
|
|
sta (ptr1),y
|
|
txa
|
|
sta (ptr2),y
|
|
iny
|
|
dec ptr3
|
|
bne @L3
|
|
|
|
; Done
|
|
|
|
@L9: rts
|
|
|
|
|