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

Cownie, James H via Openmp-dev openmp-dev at lists.llvm.org
Wed Oct 17 01:47:29 PDT 2018

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

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

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



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