[Openicc] GSoC & oyranos

[Bob Friesenhahn]

On Sat, 4 Apr 2009, Kai-Uwe Behrmann wrote:

> Ah, that is a point I did not really understand. So a library can add a
> (GPU) backend to LLVM at runtime? E.g. thus enabling GPU support in
> gallium3d while OpenGTL has no benefit?
> So a (longterm) plan could be:
>   CTL/Shiva -> IL -> GLSL -> IL -> GPU/CPU assembler code ?

It seems that the LLVM VM just needs to be ready to accept 
instructions.  Based on what I saw while building LLVM, it seemed like 
assembly output for all supported targets is available in one build.

Not having any experience with LLVM before, I installed it on a 
FreeBSD/Xeon system and built GraphicsMagick with it.  Then I ran a 
benchmark suite which uses OpenMP.  Usually native GCC was somewhat 
faster than LLVM generated code, but for some floating-point intensive 
algorithms, LLVM was faster.  I would say that performance was pretty 
competitive.

OpenMP was detected and worked.

The only anomally I noticed was that C++ exceptions did not work in 
the build.

There is no autotools support for building LLVM IL files so I was 
unable to test its bitstream VM capability.

Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/