Add SYCL/ComputeCpp and libraries

[mattgodbolt]

Compiler: https://www.codeplay.com/products/computesuite/computecpp - NB EULA needs looking at.

Also worth looking at:

• https://github.com/codeplaysoftware/computecpp-sdk
• https://github.com/KhronosGroup/OpenCL-Headers

Requested by Jan Wilmans over email.

[mattgodbolt]

Clicking the link: it requires registratration. EULA below:

---------------------------------------------------------------------

SOFTWARE LICENSE AGREEMENT

---------------------------------------------------------------------
---------------------------------------------------------------------

By downloading, installing, copying, or otherwise using the
ComputeCpp Community Edition software, including any associated
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("Software"), the user agrees to the following terms and conditions
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terms of this Agreement carefully before beginning your download, as
pressing the "I AGREE" button at the end of this Agreement will
confirm your assent. If you do not agree to these terms, then
Codeplay Software Limited is unwilling to license the Software to
you; so please press the "CANCEL" button to cancel your download.

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+-------------------------------------------+
|Redistributable Component|File Name |
|-------------------------+-----------------|
|Runtime (for Linux) |libComputeCpp.so |
|-------------------------+-----------------|
|Runtime (for Windows) |libComputeCpp.dll|
+-------------------------------------------+

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[mattgodbolt]

Cursory glance, I think we're ok. Will chat with a tame lawyer.

[mattgodbolt]

Tried a quick local install, didn't instill much confidence :)

/t/ComputeCpp-CE-1.1.0-Ubuntu-16.04-x86_64 $ bin/compute++
bin/compute++: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory

Presumably I'm a few apt-get installs from it working. But no mention in any README that I found...

[mattgodbolt]

Indeed:
$ sudo apt install libtinfo5

[janwilmans]

good, that that works, @TartanLlama or @mmha is it usefull or even possible to show SPIR-V assembly output ?

[mmha]

Hey @janwilmans,

I have ComputeCpp working with a local Compiler Explorer instance. Showing the SPIR-V assembly works out of the box, all that needs to be passed to the compiler is -I <ComputeCpp Prefix>/include and then -sycl -sycl-target spirv[32|64] (or one of the other backends) if you want to see the device code in Compiler Explorer (which adds -S by itself). I personally only added the include path and enter -sycl manually to easily switch between different backends and host/device, but for godbolt.org you can probably add the device targets as separate "compilers" in the combobox.

I should also add that you get much more readable and LLVM-like SPIR-V assembly by disassembling the binary SPIR-V module with spirv-dis from KhronosGroup/SPIRV-Tools instead of using -S.

Thinking forward, it may be a benefitial for all the heterogeneous compilers on CE (nvcc, ComputeCpp, clang + OpenMP, gcc + OpenMP/OpenACC, icc + OpenMP) to be able to select both host and device targets separately instead of grouping them by host architecture only. In fact, gcc offloading works by having two compilers installed. What do you think @mattgodbolt?

[mmha]

Oh another thing, I just saw the link to the OpenCL headers in the first post. If you want to add OpenCL as a library in CE, it would also make sense to add the OpenCL ICD Loader so the code can be linked without undefined references as well.

Another cool library to have on CE would be SYCL Parallel STL, but we can open a separate issue for this and the other libraries.

[janwilmans]

As always morris is three steps ahead of me ;) good stuff, however, I'm not sure about the ICD Loader, I thought code on compiler explorer is not linked at all?

[mmha]

Code can optionally be linked and disassembled when you click on the 11010 button right under the compiler selection combo box.

[janwilmans]

Oh, is that what that does.... thanks.

[rolandschulz]

It would be nice if it was possible to add not only the CodePlay compiler but also the Intel initiated open-source compiler (https://lists.llvm.org/pipermail/cfe-dev/2019-January/060811.html https://github.com/intel/llvm/tree/sycl). BTW: There are also other SYCL implementations (for an overview see e.g. https://raw.githubusercontent.com/illuhad/hipSYCL/master/doc/img/sycl-targets.png).

[mattgodbolt]

Thinking forward, it may be a benefitial for all the heterogeneous compilers on CE (nvcc, ComputeCpp, clang + OpenMP, gcc + OpenMP/OpenACC, icc + OpenMP) to be able to select both host and device targets separately instead of grouping them by host architecture only. In fact, gcc offloading works by having two compilers installed. What do you think @mattgodbolt?

I don't really know...I've not used any of these technologies so don't have a strong opinion. Sounds like a bit of UI work to have two separate compilers to pick?

[partouf]

As per #4019 I think we can close this issue (and if not I'll refer to the discussion in #2244)