https://bugs.llvm.org/show_bug.cgi?id=49779
Bug ID: 49779
Summary: The device runtime cannot simply skip nested parallel
regions but it has to execute them
Product: OpenMP
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Runtime Library
Assignee: unassignedb...@nondot.org
Reporter: jdoerf...@anl.gov
CC: a.bat...@hotmail.com, jonathanchesterfi...@gmail.com,
llvm-bugs@lists.llvm.org
The following code (https://godbolt.org/z/aMqTePnE9) should increment
C between 2 and 6 times, depending on the choice of #threads for the parallel
regions. Clang right now increments C only once, which is wrong. The problem is
the nested parallel region is skipped completely but it should be executed by
at least one thread (for each encountering thread), thus we should see 3 given
our current mapping of the parallel region in main.
```
void work(int *C) {
#pragma omp atomic
++(*C);
}
void use(int *C) {
#pragma omp parallel num_threads(2)
work(C);
}
int main() {
int C = 0;
#pragma omp target map(C)
{
use(&C);
#pragma omp parallel num_threads(2)
use(&C);
}
return C;
}
```
This bug is to make sure the new runtime doesn't have the same issue.
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