Re: [hatari-devel] Issues with cache hits/misses?

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 01/06/2015 23:04, Nicolas Pomarède a écrit :

> I don't see either :) But just try the lines I show in previous mail,
> and you will see that speed gets higher.
>
> No, this just returns the same value, so I don't see how it could change
> the emulated ST.

"mystery" solved, altough cache and direct memory read should return the 
same value, the TOS was slow during blitter access, and it turned out 
that when I factorized some code earlier, I forgot to remove an old call 
that wrongly marked the IO region as cachable :( So, when TOS waited for 
blitter to end, it never read the real time status, but an old value and 
waited much longer than expected...

That's better, because I didn't see how a shift in the code could have 
made the emulation slower ; in fact it was the shifted value that was 
wrong in the particular case of the blitter (which explains why TOS 3 
for TT was not slowed down, it doesn't have a blitter :) )

Nicolas