mirror of
https://github.com/cc65/cc65.git
synced 2024-12-24 11:31:31 +00:00
27 lines
442 B
ArmAsm
27 lines
442 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 29.12.1999
|
|
;
|
|
; CC65 runtime: Decrement eax by value in Y
|
|
;
|
|
|
|
.export deceaxy
|
|
.importzp sreg, tmp1
|
|
|
|
deceaxy:
|
|
sty tmp1
|
|
sec
|
|
sbc tmp1
|
|
sta tmp1
|
|
txa
|
|
sbc #0
|
|
tax
|
|
lda sreg
|
|
sbc #0
|
|
sta sreg
|
|
lda sreg+1
|
|
sbc #0
|
|
sta sreg+1
|
|
lda tmp1
|
|
rts
|
|
|