Re: [hatari-devel] DSP performance

[Douglas Little <doug694@xxxxxxxxxxxxxx>]

Actually this whole thing still bothers me at some level. I can't quite put
my finger on it, but something doesn't add up in my head :-)

If there is one big table that specifies cycle counts for CPU instructions
(which seems fair) and everything is relative to that as a master
reference  then surely all other divergences would just cancel out? Except
for divergence vs wallclock time - but that's not an issue here.

i.e. if the DSP runs an op which it thinks takes 2 master cycles and the
CPU runs an op which it thinks takes 8 master cycles, then you can expect 4
DSP ops executed in that same time.

If something breaks the CPU op timing so it takes 16 cycles, the DSP just
gets to execute 8 ops instead. The CPU got virtually slower. The DSP did
not get faster.