[XviD-devel] [PATCH] Possible patches for decoder speedup

Edouard Gomez ed.gomez at free.fr
Thu May 20 23:46:37 CEST 2004

Edouard Gomez (ed.gomez at free.fr) wrote:
> Patches are attached, i'd like to have feedback on both.

The setedges patch idea wasgood, but the implementation was
completly wrong, i wonder what i was tking about at the moment
i hacked it. I have a bugfree version ready for commit.

> Results on a 4min sequence:
> no patches:
> BENCHMARKs: VC:  35,539s VO:   0,038s A:   0,000s Sys:   2,103s =   37,681s
> int32 patch alone:
> BENCHMARKs: VC:  35,075s VO:   0,037s A:   0,000s Sys:   2,134s =   37,246s 
> Both patches applied:
> BENCHMARKs: VC:  32,364s VO:   0,038s A:   0,000s Sys:   2,175s = 34,577s
> To show we wtill sux at decoding :-)
> Libavcodec:
> BENCHMARKs: VC:  22,334s VO:   0,042s A:   0,000s Sys:   2,435s =   24,812s

I did some tests this afternoon, w/o oprofile, and i got much
better results both for xvid and ffmpeg. We're still lagging
far behind tho.

I noticed many inline functions were'nt being inlined by gcc,
and even increasing inline threshold (thus making sure all
inline functions were inlined), the decoder wasn't that
faster. So i think i can't get it faster w/o some real
changes to it. But im short on ideas, i'm open to suggestions.

Edouard Gomez

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