Re: Bug#842513: vlc: immediate crash on launch on powerpc

[lsorense@csclub.uwaterloo.ca (Lennart Sorensen)]

On Fri, Nov 04, 2016 at 10:41:57AM -0400, Lennart Sorensen wrote:
> Well it's not the complete solution yet.
> 
> I have it down to only deinterlace being miscompiled (it auto vectorized
> Generic* functions with altivec instructions, which is not good).
> 
> At the moment it looks like either the altivec stuff has to be #ifdef
> out and compiled in a separeta pass like the yuv _altivec_ plugin, or
> gcc #pragma has to be used to only enable altivec in the one function
> (which I am trying now).  #pragma seems a tad ugly though.
> 
> I suspect gcc didn't always generate vector code automatically when
> -maltivec was passed, but these days it does, even at -O2 it seems,
> even though all the places I can find in the documentation says only -O3
> enables vectorization.

This would of course go much faster if I currently had access to a
powerpc box rather than running in qemu. :)

I miss the p710 at my previous job.

-- 
Len Sorensen