llvm dev - Jun 2016 - PTX generation from CUDA file for compute capability 1.0 (sm_10)

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
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Hi Ginu,

I don't believe so, no. Art and Justin would know best here I think if
there were or how difficult it would be to target that far back.

-eric

On Wed, Jun 1, 2016 at 10:18 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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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
>

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
--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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You may be out of luck. http://reviews.llvm.org/rL178417 committed in 2013
says:
"[NVPTX] Remove support for SM < 2.0. This was never fully supported
anyway."

--Artem

On Wed, Jun 1, 2016 at 10:18 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
>
>

-- 
--Artem Belevich
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Hello Artem,

Thanks for the mail. I think I may need to dig down a little bit to see
which part is supported and try out some way to make the compilation happen.

Best regards,
Ginu

On Fri, Jun 3, 2016 at 1:07 AM, Artem Belevich <tra at google.com> wrote:
> You may be out of luck. http://reviews.llvm.org/rL178417 committed in
> 2013 says:
> "[NVPTX] Remove support for SM < 2.0. This was never fully
supported
> anyway."
>
> --Artem
>
> On Wed, Jun 1, 2016 at 10:18 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
>>
>>
>
>
> --
> --Artem Belevich
>
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