Re: [stella] Loops with two counters

Subject: Re: [stella] Loops with two counters
From: Manuel Rotschkar <cybergoth@xxxxxxxx>
Date: Thu, 7 Jul 2005 15:47:13 -0400

Hi Bob!

> So, the looping code looks something like this:
>
>   dey                 ;+2   50
>
>   tya                 ;+2   52
>   cmp BlockChange,X   ;+4   56
>   bne Kernel1Loopa    ;+2   58
>   dex                 ;+2   60
>   bpl Kernel1Loopb    ;+3   63
>
> That takes 15 cycles. Is there a faster way?  I really need a few more 
> cycles :)

Hard to tell from the snippet. If you'd swap x and y, you could do
cpx BlockChange,y
saving you the 2 cycles for the TYA...

Greetings,
Manuel
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Current Thread
[stella] Loops with two counters Bob Montgomery - 7 Jul 2005 19:26:58 -0000 Manuel Rotschkar - 7 Jul 2005 19:47:15 -0000 <= <Possible follow-ups> Bob Montgomery - 7 Jul 2005 19:49:45 -0000 Manuel Rotschkar - 7 Jul 2005 19:55:57 -0000 Bob Montgomery - 7 Jul 2005 19:54:07 -0000 Manuel Rotschkar - 7 Jul 2005 19:57:33 -0000

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