[Slackers] conditional performance

[Jaymz Julian]

On Mon, Apr 17, 2006 at 07:49:50PM -0600, Steve Judd wrote:
> The first one assembles to
> 
> 	lda a
> 	bne :skip
> 	lda b
> 	bne :skip
> 	inc $d020
> :skip
> 
> while the first one is
> 
> 	lda a
> 	and b
> 	bne :skip
> 
> (which assumes a and b are logical 1 or 0 -- if a=1 and b=2 the branch
> won't be taken, for example.)
> 
> (Note, by the way, that parethesis aren't required.)

Yeah, in my case the first piece of code is actually preferable in a lot 
of cases, since my if statements are complicated - stuff like 
if(enemy(y)=pY) and (enemyx(y)=px) ends up being quicker if it doesn't
have to do the second lookup 70%+ of the time :)

	--jj


-- 
--
Jaymz Julian - Coder, Visionary, Fat Ass.
"Hannibal is a serial killer. He only likes to kill and eat people. 
 Very few people have `I want to be killed and eaten' on their cards, 
 so Hannibal is out of a job." - http://cards.sf.net