[all-commits] [llvm/llvm-project] 48ca3a: [OpenMP] Extend omp teams to permit nested omp atomic

[Joel E. Denny via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 48ca3a5ebb156ccb776eea399138b7cda4d13395
      https://github.com/llvm/llvm-project/commit/48ca3a5ebb156ccb776eea399138b7cda4d13395
  Author: Joel E. Denny <jdenny.ornl at gmail.com>
  Date:   2022-05-26 (Thu, 26 May 2022)

  Changed paths:
    M clang/lib/Sema/SemaOpenMP.cpp
    M clang/test/OpenMP/nesting_of_regions.cpp
    A openmp/libomptarget/test/offloading/target-teams-atomic.c
    A openmp/runtime/test/teams/teams-atomic.c

  Log Message:
  -----------
  [OpenMP] Extend omp teams to permit nested omp atomic

OpenMP 5.2, sec. 10.2 "teams Construct", p. 232, L9-12 restricts what
regions can be strictly nested within a `teams` construct.  This patch
relaxes Clang's enforcement of this restriction in the case of nested
`atomic` constructs unless `-fno-openmp-extensions` is specified.
Cases like the following then seem to work fine with no additional
implementation changes:

```
 #pragma omp target teams map(tofrom:x)
 #pragma omp atomic update
 x++;
```

Reviewed By: ABataev

Differential Revision: https://reviews.llvm.org/D126323