English Amiga Board - View Single Post - nOOb needing help to understand Conditional Branching

deimos · 25 October 2019, 06:51

You conditionally branch, using the opposite condition, over a branch, so that the bar only gets e ecuted if your condition was true. So to call a subroutine only if d0 is equal to zero:

Code:

        tst.w   d0
        bne     1$
        bar     subroutine
1$      more code...

Use local labels for stuff like this, otherwise you'll spend more time thinking of names than coding.

25 October 2019, 06:51	#2
deimos It's coming back! Join Date: Jul 2018 Location: comp.sys.amiga Posts: 762	You conditionally branch, using the opposite condition, over a branch, so that the bar only gets e ecuted if your condition was true. So to call a subroutine only if d0 is equal to zero: Code: tst.w d0 bne 1$ bar subroutine 1$ more code... Use local labels for stuff like this, otherwise you'll spend more time thinking of names than coding. Last edited by deimos; 25 October 2019 at 07:35.