[llvm-bugs] [Bug 46196] New: [5.0] taskwait with depend clause not supported

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46196

            Bug ID: 46196
           Summary: [5.0] taskwait with depend clause not supported
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Clang Compiler Support
          Assignee: unassignedclangbugs at nondot.org
          Reporter: protze at itc.rwth-aachen.de
                CC: llvm-bugs at lists.llvm.org

$ cat taskwait-depend.c
int main(){
  int a;
#pragma omp task depend(out:a)
{}
#pragma omp taskwait depend(in:a)
}

$ clang -fopenmp -fopenmp-version=50 taskwait-depend.c
taskwait-depend.c:5:22: error: unexpected OpenMP clause 'depend' in directive
'#pragma omp taskwait'
#pragma omp taskwait depend(in:a)


OpenMP 5.0 introduced taskwait with the depend clause as an alias for:

#pragma omp task if(0) depend(in:a)
{}


Clang should generate code to call __kmpc_omp_wait_deps (as it does for the
included task). It is not necessary to generate code for the empty task.



OpenMP 5.1 will additionally introduce the nowait clause for taskwait, which
allows to add empty dependency nodes to the DAG.

#pragma omp taskwait depend(in:a) depend(out:b) nowait

is equivalent to

#pragma omp task depend(in:a) depend(out:b)
{}

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