toby with the processing power we have now a days it shouldnt hit
performance badly. especially since cache size and speeds are getting
quicker
On Thu, Apr 1, 2010 at 11:40 PM, Tobias Doerffel
<[email protected]>wrote:
> Hi,
>
> Am Donnerstag, 25. März 2010 16:46:35 schrieb Stefan Fendt:
> > While it's trivial to change the filter-coeffs to doubles (as modern
> > machines do all fp-stuff in doubles and just cast to floats afterwards
> > this should even give a little speed-boost) in
> > ./includes/basic_filters.h, I wonder what would be needed to do the same
> > for the internal sample-format...
> >
> > I see that ./include/lmms_basics.h defines this:
> > > typedef float sample_t; // standard sample-type
> >
> > But if I just change it, I get a bunch of compiler-errors for
> > "sample_buffer.cpp" due to hard-coded floats instead of sampe_t's ...
> >
> > Just in case I fix that, what other "happy" side-effects would the
> > change of sample_t from float to double imply?
> We discussed about that 2 years ago or so. AFAIR there was no clear result
> so
> we left things as they were. Changing internal processing sample format to
> double definitely would be nice if it does not introduce performance
> regressions (whichI fear due to double data rate and thus less CPU cache
> efficiency). I'd like to see you providing a nice patch for that and make
> some
> benchmarks and/or send the patch to this list, so other people can test it.
> If
> the benchmark results convince, we'll apply the patch.
>
> Toby
>
>
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--
Jonathan Aquilina
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