[Openmp-dev] Question about gcc support related to file kmp_gsupport.cpp

[Joachim Protze via Openmp-dev]

If this function is also in the interface of libgomp.so, there might be a
use case for this function. You can either look into the codegen source of
gcc or ask at the gcc compiler list.

-joachim

Tianyi Zhang via Openmp-dev <openmp-dev at lists.llvm.org> schrieb am Mi., 17.
Okt. 2018, 17:04:

> Thanks, Jim,
> I was wondering why there is a function :
>
> PARALLEL_LOOP(KMP_EXPAND_NAME(KMP_API_NAME_GOMP_PARALLEL_LOOP_STATIC),
>               kmp_sch_static, OMPT_LOOP_PRE, OMPT_LOOP_POST)
>
> which maps gcc call to clang but never used or called.
>
> On Wed, Oct 17, 2018 at 3:47 AM Cownie, James H <james.h.cownie at intel.com>
> wrote:
>
>> Your question is really about the code which is generated by gcc for a
>> statically scheduled loop, which has nothing to do with the runtime.
>>
>>
>>
>> If you investigate how gcc compiles a statically scheduled OpenMP loop
>> (look at https://godbolt.org/z/GtUnND for instance), you’ll see that
>> there are no calls into the runtime for static loop scheduling.
>>
>>
>>
>> -- Jim
>>
>> Jim Cownie <james.h.cownie at intel.com>
>> CVCG/DPD/TCAR (Technical Computing, Analyzers, and Runtimes)
>>
>> Tel: +44 117 9071438
>>
>>
>>
>> *From:* Openmp-dev [mailto:openmp-dev-bounces at lists.llvm.org] *On Behalf
>> Of *Tianyi Zhang via Openmp-dev
>> *Sent:* Tuesday, October 16, 2018 10:27 PM
>> *To:* openmp-dev at lists.llvm.org
>> *Subject:* [Openmp-dev] Question about gcc support related to file
>> kmp_gsupport.cpp
>>
>>
>>
>> Hi,
>>
>> Could anyone familiar with the gcc support for llvm-openmp help with this:
>>
>>
>>
>> When I build everything with gcc, and using debug mode, the
>> debugger refuses to stop at
>>
>>
>>
>> #pragma omp parallel
>>
>> #pragma omp *for *schedule(*static*)
>>
>>  It seems that for schedule(static) is not mapped to GCC.
>>
>>
>>
>> Or is there any marco that are introduced inside function
>>
>> KMP_EXPAND_NAME(KMP_API_NAME_GOMP_PARALLEL)
>>
>> As It is only calling this function when I was running the program.
>>
>>
>>
>>
>>
>> however, if I use
>>
>> #pragma omp parallel
>>
>> #pragma omp *for *schedule(dynamic)
>>
>> it is calling
>>
>> *void *KMP_EXPAND_NAME(KMP_API_NAME_GOMP_PARALLEL_LOOP_DYNAMIC)
>>
>>
>>
>> Thanks,
>>
>> Tianyi
>>
>>
>>
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