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

C Bergström via llvm-dev llvm-dev at lists.llvm.org
Thu Jun 2 00:34:22 PDT 2016

I think you may have answered your own question - If CUDA 7.5 doesn't
support sm_10 then you'll eventually hit that as a problem. So yes if
possible make sure you're installing a version of CUDA toolkit which
supports the target you need.

I'm not certain the exact compilation flow when fighting this, but
ensure the underlying nvcc and ptxas work first for sm_10 before
trying to get llvm involved.

On Thu, Jun 2, 2016 at 3:23 PM, ginu jacob <ginujacob10 at gmail.com> wrote:
> 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
> directory
> 1 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
> --cuda-gpu-arch=sm_10
> 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,
> Ginu
> On Thu, Jun 2, 2016 at 2:36 PM, C Bergström <cbergstrom at pathscale.com>
> wrote:
>> 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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