[Openmp-dev] Mapping of non-trivial type support

[Itaru Kitayama via Openmp-dev]

In which issue the virtual function offloading feature support being worked
on? I am not certain still after
going over the OpenMP 5.0 features list.


On Fri, Aug 9, 2019 at 2:32 AM Doerfert, Johannes <jdoerfert at anl.gov> wrote:

> Itaru, a webpage with implementation status details is in the works,
>   https://reviews.llvm.org/D64375
> but it seems hard to agree on an initial version.
>
> On 08/05, Itaru Kitayama via Openmp-dev wrote:
> > Alexey et al.,
> > What's the plan for OpenMP 5.0 API adoption in Clang? Would you point me
> to
> > a link to an appropriate web page?
> > Is there an OpenMP 5.0 API work-in-progress branch which I can give it a
> > try?
> >
> > On Sun, Aug 4, 2019 at 8:57 PM Alexey Bataev <a.bataev at hotmail.com>
> wrote:
> >
> > > clang works in accordance with the standard. Standard says that
> mapping is
> > > performed as bitwise copy of the objects. You can perform the bitwise
> copy
> > > safely only for the trivial types.
> > > You cannot simply map a vector. You need to convert it to C/C++ array
> at
> > > first.
> > > OpenMP 5.0 introduced user-defined mappers to solve the problem of
> > > non-trivial types mapping, which are not supported by clang yet. We're
> > > working on this feature.
> > >
> > > Best regards,
> > > Alexey Bataev
> > >
> > > > 4 авг. 2019 г., в 1:16, Itaru Kitayama via Openmp-dev <
> > > openmp-dev at lists.llvm.org> написал(а):
> > > >
> > > > Hi,
> > > > This simple code:
> > > >
> > > > int main() {
> > > >
> > > > std::vector<int> v(100, 0);
> > > > #pragma omp target teams distribute parallel for map(tofrom: v)
> > > >    for (int i=0;i<100;i++) {
> > > >         v[i] =i;
> > > >    }
> > > > };
> > > >
> > > > causes Clang to warn a message like:
> > > >
> > > > vectormap.cpp:31:62: warning: Non-trivial type 'std::vector<int>' is
> > > mapped, only trivial types are guaranteed to be mapped correctly
> > > [-Wopenmp-target]
> > > > #pragma omp target teams distribute parallel for map(tofrom: v)
> > > >
> > > >                                    ^
> > > > 1 warning generated.
> > > >
> > > > ... and encounters an issue at run time. How much non-trivial types
> are
> > > > supported in trunk Clang?
> > > > _______________________________________________
> > > > Openmp-dev mailing list
> > > > Openmp-dev at lists.llvm.org
> > > > https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
> > >
>
> > _______________________________________________
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> > Openmp-dev at lists.llvm.org
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>
>
> --
>
> Johannes Doerfert
> Researcher
>
> Argonne National Laboratory
> Lemont, IL 60439, USA
>
> jdoerfert at anl.gov
>
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