[FFmpeg-devel] [PATCH] 'vorbis_residue_decode' optimizations

[Siarhei Siamashka]

Hi,

This trivial patch improves overall vorbis decoding performance by ~3% on
Pentium-M with gcc 4.2.3

Maybe some variations of it can provide even more improvement (more separate 
implementations for the typical values of 'ch' and 'vlen'). Respecting
CONFIG_SMALL would be also a good idea.

Anyway, 'vorbis_residue_decode' is currently one of the parts of ffvorbis
decoder that takes quite a lot of time, adding some optimizations to it
(including those that are already mentioned as FIXME in the sources) should
help quite a lot.

-- 
Best regards,
Siarhei Siamashka
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