[Mesa-dev] [r600g] Is LLVM-compiler (--enable-r600-llvm-compiler) usable, now?

[Alex Deucher]

On Wed, Oct 22, 2014 at 12:49 PM, Dieter Nützel <Dieter at nuetzel-hh.de> wrote:
> Hello Michel,
>
> subject say it all ;-)

The llvm support for r600g is for compute (OpenCL).  The fact that is
it somewhat usable for graphics is mainly for testing purposes.  There
are no plans to expand it to handle additional graphics features,
although any interested parties are welcome to contribute to improving
it.  IIRC, even when you enable it, it currently only gets applied to
compute shaders.

>
> Second, we are now nearly on par with 3.16 on RV730 (AGP) with all your
> latest work, but I think about what we could get if we find the right commit
> between 3.16 (.4 here) and 3.17-rc1 (the transition from 3.16 to 3.17-next).
>
> I do not have 3.16.x around (it is not any longer in the openSUSE kernel
> current tree) but with latest 3.16.4 I was faster then with all 3.17.x and
> 3.18/3.19-next kernels.
>
> bisect do not work right or I couldn't revert the 'right' commit.
> WC helped on RV730 (AGP) with some apps, here:

How are you doing the bisection?  If it's purely a performance issue
it should be pretty straight forward.

>
> mesa-demos e.g.
> vsraytrace
> fsraytrace
> objview
>
> Any ideas?

Can you provide some additional detail?  It would probably be easier
to track this in a bug report.

Alex