[FFmpeg-devel] [PATCH] Faster CABAC H.264 residual decoding

Michael Niedermayer michaelni
Mon Apr 28 01:40:48 CEST 2008

On Sun, Apr 27, 2008 at 02:09:12PM +0200, Nicolas George wrote:
> Le nonidi 9 flor?al, an CCXVI, matthieu castet a ?crit?:
> > > On the advice of #ffmpeg-devel I have made a version with uint8_t
> > > arrays instead of int.
> > Don't forget that some cpu (arm for example) don't have native 8 bits 
> > operation. Everything is done in 32 bits, and 8 bits behavior is 
> > emulated with extra operation.
> I think it may be worth reminding the existence if uint_fast8_t, wihci is
> the fastest integer type of size at least 8.

True but is it anywhere different from uint8_t ?
Anyway iam fine with uint_fast8_t as well, if someone wants to change
all/most tables in ffmpeg to that _and_ shows that it is faster on at least
one architecture. (that can be with a #define uint_fast8_t uint32_t or so)

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

There will always be a question for which you do not know the correct awnser.
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