Re: RE: [stella] "Zombie" optimizations

Subject: Re: RE: [stella] "Zombie" optimizations
From: Thomas Jentzsch <tjentzsch@xxxxxx>
Date: Fri, 17 Jan 2003 17:34:43 +0100
Dennis Debro wrote:
> What do you think?

Your code works as long as you only new have one single object that can start at random positions.  

If you use more than one object (and/or VDELPx) then you will need a more general solution, because then you can't "waste" a whole register for every object. That's what .skipDraw and my latest "Zombie optimization" are made for.

> I'd love to hear comments on how it could've been improved.

I think the first BMI is avoidable. As long as X is negative (or < 0) the carry flag will also be set after the compare.

> I will study this optimization too. It will help me get more familiar
> with your tricks :)

I hope my explanations make sense. :-)


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