llvm dev - Dec 2011 - [LLVMdev] Build PTX samples with LLVM/Clang/libclc

Hi Justin,

  I download llvm-ptx-samples [1] and try to build them. I found it seems lack
of a complete document on how to build them with LLVM/Clang/libclc. Do you think
it's a good idea to put a complete document/tutorial in _one_ place?
Currently,
there are your website [2], LLVM [3], Clang and libclc websites [5] over there.
I feel people might get lost among those websites. ;-)

  Here are my flows, hope it's useful to you. (At least [1] should be
updated to
include libclc)

1. Build LLVM/Clang with PTX support.

2. Download your PTX samples and libclc, then build them. I guess you want to
   pull libclc under llvm-ptx-samples/libclc/, right?

---
$ git clone git://github.com/jholewinski/llvm-ptx-samples.git
$ cd llvm-ptx-samples; rm -rf libclc/
$ git clone git://git.pcc.me.uk/~peter/libclc.git
# Build libclc first
$ cd libclc/
$ ./configure.py --with-llvm-config=/path/to/llvm-config && make
# Then build your PTX samples
$ cd ../; make build; cd build
$ cmake ../
$ make
---

  O.K., I have a problem here.

[ 12%] Compiling blur2d_kernel.cl -> blur2d_kernel.ll
clang: error: no such file or directory: 'ptx32'
make[2]: *** [bin/blur2d_kernel.ll] Error 1
make[1]: *** [opencl/blur2d/CMakeFiles/blur2d_kernel.ptx.dir/all] Error 2

  Do you know how to fix it? Thanks.

[1] https://github.com/jholewinski/llvm-ptx-samples
[2] http://sites.google.com/site/justinholewinski/projects/llvm-ptx-back-end
[3] http://llvm.org/docs/ReleaseNotes.html#whatsnew
[4] http://clang.llvm.org/docs/ReleaseNotes.html#opencl
[5] http://www.pcc.me.uk/~peter/libclc/

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj

On Tue, Dec 6, 2011 at 10:17 PM, 陳韋任 <chenwj at iis.sinica.edu.tw> wrote:
> Hi Justin,
>
>  I download llvm-ptx-samples [1] and try to build them. I found it seems
> lack
> of a complete document on how to build them with LLVM/Clang/libclc. Do you
> think
> it's a good idea to put a complete document/tutorial in _one_ place?
> Currently,
> there are your website [2], LLVM [3], Clang and libclc websites [5] over
> there.
> I feel people might get lost among those websites. ;-)
>
I agree.  I'm just not sure how these projects fit in with LLVM as a whole.
 LLVM does not really have a "samples" project, and these are very
specific
in their use-case.

>
>  Here are my flows, hope it's useful to you. (At least [1] should be
> updated to
> include libclc)
>
> 1. Build LLVM/Clang with PTX support.
>
> 2. Download your PTX samples and libclc, then build them. I guess you want
> to
>   pull libclc under llvm-ptx-samples/libclc/, right?
>
> ---
> $ git clone git://github.com/jholewinski/llvm-ptx-samples.git
> $ cd llvm-ptx-samples; rm -rf libclc/
> $ git clone git://git.pcc.me.uk/~peter/libclc.git
> # Build libclc first
> $ cd libclc/
> $ ./configure.py --with-llvm-config=/path/to/llvm-config && make
> # Then build your PTX samples
> $ cd ../; make build; cd build
> $ cmake ../
> $ make
> ---
>
>
libclc is a submodule of the llvm-ptx-samples repo.  Therefore, the flow is
simple:

$ git clone git://github.com/jholewinski/llvm-ptx-samples
$ cd llvm-ptx-samples
$ git submodule init
$ git submodule update

I'll update the documentation to reflect this.

Also, the libclc configuration is not necessary.  Only some header files
are pulled in by the samples.

>  O.K., I have a problem here.
>
> [ 12%] Compiling blur2d_kernel.cl -> blur2d_kernel.ll
> clang: error: no such file or directory: 'ptx32'
> make[2]: *** [bin/blur2d_kernel.ll] Error 1
> make[1]: *** [opencl/blur2d/CMakeFiles/blur2d_kernel.ptx.dir/all] Error 2
>
>  Do you know how to fix it? Thanks.
>
That's a new one.  I just tried a fresh clone and build, and did not
experience this issue.

Can you run "make VERBOSE=1" and post the compiler command-line?

> [1] https://github.com/jholewinski/llvm-ptx-samples
> [2]
> http://sites.google.com/site/justinholewinski/projects/llvm-ptx-back-end
> [3] http://llvm.org/docs/ReleaseNotes.html#whatsnew
> [4] http://clang.llvm.org/docs/ReleaseNotes.html#opencl
> [5] http://www.pcc.me.uk/~peter/libclc/
>
> Regards,
> chenwj
>
> --
> Wei-Ren Chen (陳韋任)
> Computer Systems Lab, Institute of Information Science,
> Academia Sinica, Taiwan (R.O.C.)
> Tel:886-2-2788-3799 #1667
> Homepage: http://people.cs.nctu.edu.tw/~chenwj
>


-- 

Thanks,

Justin Holewinski
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> I agree.  I'm just not sure how these projects fit in with LLVM as a
whole.
>  LLVM does not really have a "samples" project, and these are
very specific
> in their use-case.
  I mean maintaining a document about PTX and its samples in one place so that
people won't get lost among those website. 
> libclc is a submodule of the llvm-ptx-samples repo.  Therefore, the flow is
> simple:
> 
> $ git clone git://github.com/jholewinski/llvm-ptx-samples
> $ cd llvm-ptx-samples
> $ git submodule init
> $ git submodule update
  That's simple. I'm still learning how to git. :) 
> >  O.K., I have a problem here.
> >
> > [ 12%] Compiling blur2d_kernel.cl -> blur2d_kernel.ll
> > clang: error: no such file or directory: 'ptx32'
> > make[2]: *** [bin/blur2d_kernel.ll] Error 1
> > make[1]: *** [opencl/blur2d/CMakeFiles/blur2d_kernel.ptx.dir/all]
Error 2
> >
> >  Do you know how to fix it? Thanks.
> >
> 
> That's a new one.  I just tried a fresh clone and build, and did not
> experience this issue.
> 
> Can you run "make VERBOSE=1" and post the compiler command-line?
  Sorry, I delete the problematic source directory and cannot reproduce it. :/
`git submodule` works fine. Thanks! :)

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj