[llvm-dev] [OpenCL][AMDGPU] Using AMDGPU generated kernel code for OpenCL

[Philipp Schaad via llvm-dev]

Hi Michael

Thank you for those two links.
So if I understand that correctly, this means that the ISA generated by the
AMDGPU backend is only a part of the expected elf-linked binary file, and
would have to be correctly wrapped/packed up in order for OpenCL to accept
it?

Best,
Philipp

On Tue, 9 May 2017 at 15:49 Michael Kruse <llvmdev at meinersbur.de> wrote:

> The binary format expected by AMD OpenCL drivers are elf-linked binaries.
> See
>
> http://openwall.info/wiki/john/development/AMD-IL
> https://community.amd.com/thread/166955
>
> Michael
>
>
> 2017-05-08 11:43 GMT+02:00 Philipp Schaad via llvm-dev
> <llvm-dev at lists.llvm.org>:
> > Hello everyone
> >
> > I was wondering, what the correct way of using an AMDGPU generated kernel
> > code for OpenCL was. I am trying to provide Polly's GPGPU Code generation
> > with the ability to run on different GPU devices, such as AMD GPUs.
> >
> > For NVIDIA, I simply retrieve a pre-compiled PTX string from the NVPTX
> > backend and pass that to OpenCL's 'clCreateProgramWithBinary' function.
> > However, when doing the same with the AMDGPU backend and its returned
> kernel
> > string, OpenCL complains about an invalid binary.
> > This has been tried with a number of different target triples (eg.
> > 'amdgcn--', 'amdgcn-amd-amdhsa' etc), and my assumption so far is, that
> I am
> > not trying the correct Triple.
> > Or am I missing something entirely, and there have to be additional
> steps,
> > to get the correct ELF binary?
> >
> > Thank you in advance for any help and pointers!
> >
> > Best,
> > Philipp
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
>
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