23 lines
305 B
ArmAsm
23 lines
305 B
ArmAsm
.define Tle
|
|
|
|
! This subroutine tests if the value in registerpair AX is
|
|
! less than or equal to zero.
|
|
! The value returned is in AX.
|
|
|
|
|
|
Tle:
|
|
tay
|
|
bpl 1f ! A >= 0
|
|
3: lda #0 ! AX <= 0
|
|
ldx #1
|
|
rts
|
|
1: beq 1f ! A = 0
|
|
2: lda #0 ! AX > 0
|
|
tax
|
|
rts
|
|
1: txa
|
|
bne 2b ! X > 0
|
|
beq 3b ! x = 0
|
|
|
|
|