[llvm-dev] PTX generation from CUDA file for compute capability 1.0 (sm_10)

ginu jacob via llvm-dev llvm-dev at lists.llvm.org
Thu Jun 2 00:23:31 PDT 2016

Hello Bergström/Eric,

Thanks for the reply. The G80(sm_10) architecture was ported on FPGA by a
group of researchers (http://www.ecs.umass.edu/ece/tessier/andryc-fpt13.pdf).
Our group have some further research interest on this work. I was working
on modifying the Clang-LLVM for a couple of months and achieved the
required changes. But Clang-LLVM is only allowing me to generate PTX for
sm_20, sm_30 etc.While trying to generate PTX for sm_10, it gave

*error: unknown target CPU 'sm_10'*
*fatal error: cannot open file '/tmp/shared-395893.s': No such file or
directory1 error generated.*

The compilation command used is:
clang -Xclang -I$LIBCLC/include/generic -I$LIBCLC/include/ptx
-Dcl_clang_storage_class_specifiers -O3 CudaSource.cu -S -o PtxOutput.ptx

Is there any chance that this error being generated from CUDA runtime alone
since I am using CUDA 7.5 which does not support sm_10. If there is any
chance that the error is isolated from LLVM and is only due to CUDA, i have
some hope to use a lower CUDA version. Please let me know your suggestions.

Thank you,

On Thu, Jun 2, 2016 at 2:36 PM, C Bergström <cbergstrom at pathscale.com>

> What happens if you hack change llvm to accept sm_10? Do you get an
> error somewhere further down the pipeline?
> sm_10 is pretty old hardware - Why the strong dependency on this?
> On Thu, Jun 2, 2016 at 1:18 PM, ginu jacob via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > Hello,
> >
> > When generating the PTX output from CUDA file(.cu file), the minimum
> target
> > that is accepted by LLVM is sm_20. But I have a specific requirement to
> > generate PTX output for compute capability 1.0 (sm_10). Is there any
> > previous version of LLVM supporting this?
> >
> > Thank you,
> > Ginu
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
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