20 lines
286 B
ArmAsm
20 lines
286 B
ArmAsm
.define Ngi2
|
|
|
|
! This subroutine negates the integer in registerpair AX.
|
|
! The negation is a one's complement plus one.
|
|
|
|
|
|
Ngi2:
|
|
eor #0FFh ! one's complement A
|
|
tay
|
|
txa
|
|
eor #0FFh ! one's complement X
|
|
tax
|
|
inx ! increment X
|
|
bne 1f
|
|
iny ! increment A if neccesairy
|
|
1: tya
|
|
rts
|
|
|
|
|