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

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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Hi, Ginu.

No earlier version of llvm supports sm_10.  It's not something I have
looked at deeply, but I expect adding support would be nontrivial, because
one would have to teach the nvptx backend which machine instructions are
and are not available in that architecture.

Regards,
-Justin
On Jun 2, 2016 12:23 AM, "ginu jacob via llvm-dev" <llvm-dev at
lists.llvm.org>
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
> 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
>> >
>>
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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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
>> >
>
>

Previously when I started with installation of LLVM and CUDA, I had a very
bad time with the error "Unsupported CUDA version!". I remember it now
and
dig down a bit into the LLVM source code. In the LLVM file
*llvm/tools/clang/lib/Headers/__clang_cuda_runtime_wrapper.h *
*(http://clang.llvm.org/doxygen/cuda__runtime_8h_source.html
<http://clang.llvm.org/doxygen/cuda__runtime_8h_source.html>)*
there is a check for the CUDA_VERSION and it allows only versions between 7
and 7.05. So is there a handy way of checking this file for previous LLVM
versions so that I can avoid heading into a catastrophe which I am certain
about and give a better chance for success...



On Thu, Jun 2, 2016 at 3:34 PM, C Bergström <cbergstrom at pathscale.com>
wrote:
> 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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