Re: Re: [cc65] bank switching/retro replay?

From: Ullrich von Bassewitz <>
Date: 2009-11-10 14:00:22
On Tue, Nov 10, 2009 at 01:51:02PM +0000, Thomas Giesel wrote:
> Good idea, so the updated mechanism would be:
> 1. Put (all) arguments on stack
> 2. Load bank number into Y
> 3. Load function address into AX
> 4. Call generic trampoline function
> Sounds faster :)

Yes, but it won't work:-) The function address may be an expression, in which
case the Y register may get destroyed when evaluating it. The bank number may
also be a 16 bit value if this has advantages for a speficic implementation.
It is my experience that it isn't a good idea to optimize too much when
designing new code. So let's do it the safe way and pass the bank number on
the stack. If the implementation shows possible improvements, there's still
time to change it.
Anyway, this won't happen anytime soon. I'm still working on the mul/div
routines and TGI, and several other things are waiting.



Ullrich von Bassewitz                        
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Received on Tue Nov 10 14:00:29 2009

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