[Ffmpeg-devel] [BUG] H.264 + AltiVec == heavy artefacts

matthieu castet castet.matthieu
Fri Oct 7 17:38:46 CEST 2005

Diego Biurrun wrote:
> Debian unstable
> PowerBook G4 7447A processor running at 1500MHz
> gcc (GCC) 4.0.2 (Debian 4.0.2-2)
> I get the same results with
> gcc-3.3 (GCC) 3.3.6 (Debian 1:3.3.6-10)
> gcc-3.4 (GCC) 3.4.5 20050821 (prerelease) (Debian 3.4.4-8)
May be seending the assembler file (gcc -S) of the faulty functions 
could help to debug this ?

How does PPC manage allignement stuff ?
Is it done in cpu or in kernel ?

For sparc machines there were a bug for some swap insctructions using 
unaligned data : the kernel trap forgot to swap them correctly....


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