Re: [cc65] Lynx target

From: Christian Krüger (christian.krueger_at_pace.de)
Date: 2003-05-05 10:38:34

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> ...
> Suzy. Suzy
> can do 16-bit multiplications, divisions and integration 
> while the CPU is
> working. 42Bastian was using these features in the old cc65 
> port. But I
> assume that there in no math-accelerator hooks in the cc65 today?

Three problems (when Suzy calcs...):

* 0 is negative 
* 0x8000 is positve

(so additional code have to fix that)

* suzy can take 56 cycles when calculating signed values
  (AFAIR 42 cycles minimum) - there are cases when
  the multiply is done by the existing cc65 lib is faster...

Regards
chrisker


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