[Openmp-dev] Visual C/C++ OpenMP

[Michael Kruse via Openmp-dev]

This sounds exciting. Do you also plan to support OpenMP offloading,
as an alternative to C++AMP?

The OpenMP contributors have a weekly phone call where implementation
questions are discussed. You might be interested to join. Details at
https://docs.google.com/document/d/1Tz8WFN13n7yJ-SCE0Qjqf9LmjGUw0dWO9Ts1ss4YOdg/edit?usp=sharing

Michael

Am Fr., 11. Dez. 2020 um 12:40 Uhr schrieb Natalia Glagoleva via
Openmp-dev <openmp-dev at lists.llvm.org>:
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> Hello!
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> Visual C/C++ compiler team in Microsoft (see Cc list) is working on updating our support for OpenMP.
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> Currently Visual C/C++ compiler supports OpenMP standard 2.0, with some exclusions. We started the work to support the newer standards.
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> As the first step we took LLVM OpenMP runtime library (libomp) and switched the Visual C/C++ compiler to generate code for OpenMP 2.0 for libomp, currently only for x64. The feature is in ‘experimental’ (or ‘beta’) state; should be available in the next release, Visual Studio version 16.9 preview 3, early next year. It’ll be available under a separate switch (-openmp:llvm), so people can try it out.
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> With this update we’ve fixed a nasty bug for shared variables (was present in Visual C/C++ compiler) and added unsigned induction variables for for loops (was not supported previously). We’ve also added some initial limited support for tasks; that one is under additional -openmp:experimental switch (not ‘beta’ quality yet, and only a minimal set of clauses is supported). There will be a more detailed announcement at the time of the release.
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> As it’s beta, we don’t have yet full quality assessment. Our internal compiler tests passed, libomp runtime tests show that we don’t have a lot of features yet (which is expected), and there are some issues with tasks which we still need to look at. We plan to try https://www.epcc.ed.ac.uk/research/computing/performance-characterisation-and-benchmarking/epcc-openmp-micro-benchmark-suiterun next. I am doing performance measurements now.
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> We’ve done several changes to libomp (additional functions), and if the performance will be good, we’d like to upstream the changes.
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> Natalia Glagoleva, MSVC
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