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

[matthieu castet]

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....


Matthieu