[stella] unrolling loops

Subject: [stella] unrolling loops
From: Glenn Saunders <mos6507@xxxxxxxxxxx>
Date: Sun, 21 Aug 2005 17:34:20 -0400
I knew it was unrealistic to think that one of the instructions in your 
kernel could be extraneous.  Anyway, unrolling the entire loop takes too 
much ROM so I just branched off into two variations, one B&W and one color, 
where all color-register loads are immediate, and it works fine that 
way.  I think I have the ROM to spare.  If I had just done that from the 
beginning I would have saved myself hours of experimentation.  I guess it's 
good practice regardless.

At 12:44 PM 8/21/2005, you wrote:
>Glenn Saunders wrote:
> > ... it feels satisfying to have been able to successfully customize
> > it this way.
>Glenn, I am very sorry to disappoint you, but you removed one
>necessary write to GRP0 (VDELPx!). So the last digit of the 2nd and
>3rd number are always the same now.
>I suggest unrolling the loop once to gain the missing cycles.

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