[MPlayer-dev-eng] [PATCH] (new version) AltiVec: dct64 for mp3lib, IMDCT for liba52, detection code
Romain Dolbeau
dolbeau at irisa.fr
Mon Jan 20 13:44:02 CET 2003
Daniel Egger wrote:
> We should try to get a statement here. I believe that the line_size
> is always a multiple of 16 for the formats we're interested in;
> even VirtualDub breaks when this is not the case.
That would be interesting, as many computations could
be moved out-of-loops in altivec (OK. mostly permutations
and useless loads, but still, it would be faster).
> Oooh, you're writing your thesis about AltiVec in mplayer?
Not at all ! AltiVec is just a way to watch movies
faster ;-) But the team works in comp.arch and
compilation, and I wondered if according to (real)
experts it was worth the hassle (to remove the
spurious load). Of course the answer is 'YMMV', but
if we can fix the line_size to a multiple of 16,
then it's likely worth it (as we'll need the load for
either all or no iterations of the loop).
--
Romain Dolbeau
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