diff options
Diffstat (limited to 'clang/docs/OpenMPSupport.rst')
| -rw-r--r-- | clang/docs/OpenMPSupport.rst | 1003 |
1 files changed, 506 insertions, 497 deletions
diff --git a/clang/docs/OpenMPSupport.rst b/clang/docs/OpenMPSupport.rst index 986aaab..58cd10a 100644 --- a/clang/docs/OpenMPSupport.rst +++ b/clang/docs/OpenMPSupport.rst @@ -1,497 +1,506 @@ -.. raw:: html - - <style type="text/css"> - .none { background-color: #FFCCCC } - .part { background-color: #FFFF99 } - .good { background-color: #CCFF99 } - </style> - -.. role:: none -.. role:: part -.. role:: good - -.. contents:: - :local: - -============== -OpenMP Support -============== - -Clang fully supports OpenMP 4.5, almost all of 5.0 and most of 5.1/2. -Clang supports offloading to X86_64, AArch64, PPC64[LE], NVIDIA GPUs (all models) and AMD GPUs (all models). - -In addition, the LLVM OpenMP runtime `libomp` supports the OpenMP Tools -Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and macOS. -OMPT is also supported for NVIDIA and AMD GPUs. - -For the list of supported features from OpenMP 5.0 and 5.1 -see `OpenMP implementation details`_ and `OpenMP 51 implementation details`_. - -General improvements -==================== -- New collapse clause scheme to avoid expensive remainder operations. - Compute loop index variables after collapsing a loop nest via the - collapse clause by replacing the expensive remainder operation with - multiplications and additions. - -- When using the collapse clause on a loop nest the default behavior - is to automatically extend the representation of the loop counter to - 64 bits for the cases where the sizes of the collapsed loops are not - known at compile time. To prevent this conservative choice and use - at most 32 bits, compile your program with the - `-fopenmp-optimistic-collapse`. - - -GPU devices support -=================== - -Data-sharing modes ------------------- - -Clang supports two data-sharing models for Cuda devices: `Generic` and `Cuda` -modes. The default mode is `Generic`. `Cuda` mode can give an additional -performance and can be activated using the `-fopenmp-cuda-mode` flag. In -`Generic` mode all local variables that can be shared in the parallel regions -are stored in the global memory. In `Cuda` mode local variables are not shared -between the threads and it is user responsibility to share the required data -between the threads in the parallel regions. Often, the optimizer is able to -reduce the cost of `Generic` mode to the level of `Cuda` mode, but the flag, -as well as other assumption flags, can be used for tuning. - -Features not supported or with limited support for Cuda devices ---------------------------------------------------------------- - -- Cancellation constructs are not supported. - -- Doacross loop nest is not supported. - -- User-defined reductions are supported only for trivial types. - -- Nested parallelism: inner parallel regions are executed sequentially. - -- Debug information for OpenMP target regions is supported, but sometimes it may - be required to manually specify the address class of the inspected variables. - In some cases the local variables are actually allocated in the global memory, - but the debug info may be not aware of it. - - -.. _OpenMP implementation details: - -OpenMP 5.0 Implementation Details -================================= - -The following table provides a quick overview over various OpenMP 5.0 features -and their implementation status. Please post on the -`Discourse forums (Runtimes - OpenMP category)`_ for more -information or if you want to help with the -implementation. - -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -|Category | Feature | Status | Reviews | -+==============================+==============================================================+==========================+=======================================================================+ -| loop | support != in the canonical loop form | :good:`done` | D54441 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | #pragma omp loop (directive) | :part:`partial` | D145823 (combined forms) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | #pragma omp loop bind | :part:`worked on` | D144634 (needs review) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | collapse imperfectly nested loop | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | collapse non-rectangular nested loop | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | C++ range-base for loop | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | clause: if for SIMD directives | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | inclusive scan (matching C++17 PSTL) | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory management | memory allocators | :good:`done` | r341687,r357929 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory management | allocate directive and allocate clause | :good:`done` | r355614,r335952 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| OMPD | OMPD interfaces | :good:`done` | https://reviews.llvm.org/D99914 (Supports only HOST(CPU) and Linux | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| OMPT | OMPT interfaces (callback support) | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| thread affinity | thread affinity | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | taskloop reduction | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | task affinity | :part:`not upstream` | https://github.com/jklinkenberg/openmp/tree/task-affinity | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | clause: depend on the taskwait construct | :good:`done` | D113540 (regular codegen only) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | depend objects and detachable tasks | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | mutexinoutset dependence-type for tasks | :good:`done` | D53380,D57576 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | combined taskloop constructs | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | master taskloop | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | parallel master taskloop | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | master taskloop simd | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | parallel master taskloop simd | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| SIMD | atomic and simd constructs inside SIMD code | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| SIMD | SIMD nontemporal | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | infer target functions from initializers | :part:`worked on` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | infer target variables from initializers | :good:`done` | D146418 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | OMP_TARGET_OFFLOAD environment variable | :good:`done` | D50522 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | support full 'defaultmap' functionality | :good:`done` | D69204 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | device specific functions | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: device_type | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: extended device | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: uses_allocators clause | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: in_reduction | :part:`worked on` | r308768 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | omp_get_device_num() | :good:`done` | D54342,D128347 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | structure mapping of references | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | nested target declare | :good:`done` | D51378 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | implicitly map 'this' (this[:1]) | :good:`done` | D55982 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | allow access to the reference count (omp_target_is_present) | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | requires directive | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: unified_shared_memory | :good:`done` | D52625,D52359 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: unified_address | :part:`partial` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: reverse_offload | :part:`partial` | D52780,D155003 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: atomic_default_mem_order | :good:`done` | D53513 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: dynamic_allocators | :part:`unclaimed parts` | D53079 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | user-defined mappers | :good:`done` | D56326,D58638,D58523,D58074,D60972,D59474 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | map array-section with implicit mapper | :good:`done` | https://github.com/llvm/llvm-project/pull/101101 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | mapping lambda expression | :good:`done` | D51107 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | clause: use_device_addr for target data | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | support close modifier on map clause | :good:`done` | D55719,D55892 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | teams construct on the host device | :good:`done` | r371553 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | support non-contiguous array sections for target update | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | pointer attachment | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| atomic | hints for the atomic construct | :good:`done` | D51233 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| base language | C11 support | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| base language | C++11/14/17 support | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| base language | lambda support | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | array shaping | :good:`done` | D74144 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | library shutdown (omp_pause_resource[_all]) | :good:`done` | D55078 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | metadirectives | :part:`mostly done` | D91944, https://github.com/llvm/llvm-project/pull/128640 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | conditional modifier for lastprivate clause | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | iterator and multidependences | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | depobj directive and depobj dependency kind | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | user-defined function variants | :good:`done`. | D67294, D64095, D71847, D71830, D109635 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | pointer/reference to pointer based array reductions | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | prevent new type definitions in clauses | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory model | memory model update (seq_cst, acq_rel, release, acquire,...) | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ - - -.. _OpenMP 51 implementation details: - -OpenMP 5.1 Implementation Details -================================= - -The following table provides a quick overview over various OpenMP 5.1 features -and their implementation status. -Please post on the -`Discourse forums (Runtimes - OpenMP category)`_ for more -information or if you want to help with the -implementation. - -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -|Category | Feature | Status | Reviews | -+==============================+==============================================================+==========================+=======================================================================+ -| atomic | 'compare' clause on atomic construct | :good:`done` | D120290, D120007, D118632, D120200, D116261, D118547, D116637 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| atomic | 'fail' clause on atomic construct | :part:`worked on` | D123235 (in progress) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| base language | C++ attribute specifier syntax | :good:`done` | D105648 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | 'present' map type modifier | :good:`done` | D83061, D83062, D84422 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | 'present' motion modifier | :good:`done` | D84711, D84712 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | 'present' in defaultmap clause | :good:`done` | D92427 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | map clause reordering based on 'present' modifier | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | device-specific environment variables | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | omp_target_is_accessible routine | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | omp_get_mapped_ptr routine | :good:`done` | D141545 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | new async target memory copy routines | :good:`done` | D136103 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | thread_limit clause on target construct | :part:`partial` | D141540 (offload), D152054 (host, in progress) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | has_device_addr clause on target construct | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | iterators in map clause or motion clauses | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | indirect clause on declare target directive | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | allow virtual functions calls for mapped object on device | :part:`partial` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | interop construct | :part:`partial` | parsing/sema done: D98558, D98834, D98815 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| device | assorted routines for querying interoperable properties | :part:`partial` | D106674 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | Loop tiling transformation | :good:`done` | D76342 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | Loop unrolling transformation | :good:`done` | D99459 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| loop | 'reproducible'/'unconstrained' modifiers in 'order' clause | :part:`partial` | D127855 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory management | alignment for allocate directive and clause | :good:`done` | D115683 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory management | 'allocator' modifier for allocate clause | :good:`done` | https://github.com/llvm/llvm-project/pull/114883 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory management | 'align' modifier for allocate clause | :good:`done` | https://github.com/llvm/llvm-project/pull/121814 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory management | new memory management routines | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory management | changes to omp_alloctrait_key enum | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| memory model | seq_cst clause on flush construct | :good:`done` | https://github.com/llvm/llvm-project/pull/114072 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | 'omp_all_memory' keyword and use in 'depend' clause | :good:`done` | D125828, D126321 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | error directive | :good:`done` | D139166 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | scope construct | :good:`done` | D157933, https://github.com/llvm/llvm-project/pull/109197 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | routines for controlling and querying team regions | :part:`partial` | D95003 (libomp only) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | changes to ompt_scope_endpoint_t enum | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | omp_display_env routine | :good:`done` | D74956 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | extended OMP_PLACES syntax | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | OMP_NUM_TEAMS and OMP_TEAMS_THREAD_LIMIT env vars | :good:`done` | D138769 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | 'target_device' selector in context specifier | :none:`worked on` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | begin/end declare variant | :good:`done` | D71179 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | dispatch construct and function variant argument adjustment | :part:`worked on` | D99537, D99679 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | assumes directives | :part:`worked on` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | assume directive | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | nothing directive | :good:`done` | D123286 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | masked construct and related combined constructs | :good:`done` | D99995, D100514, PR-121741(parallel_masked_taskloop) | -| | | | PR-121746(parallel_masked_task_loop_simd),PR-121914(masked_taskloop) | -| | | | PR-121916(masked_taskloop_simd) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| misc | default(firstprivate) & default(private) | :good:`done` | D75591 (firstprivate), D125912 (private) | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| other | deprecating master construct | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| OMPT | new barrier types added to ompt_sync_region_t enum | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| OMPT | async data transfers added to ompt_target_data_op_t enum | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| OMPT | new barrier state values added to ompt_state_t enum | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| OMPT | new 'emi' callbacks for external monitoring interfaces | :good:`done` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| OMPT | device tracing interface | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | 'strict' modifier for taskloop construct | :none:`unclaimed` | | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | inoutset in depend clause | :good:`done` | D97085, D118383 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ -| task | nowait clause on taskwait | :part:`partial` | parsing/sema done: D131830, D141531 | -+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ - - -.. _OpenMP 6.0 implementation details: - -OpenMP 6.0 Implementation Details -================================= - -The following table provides a quick overview over various OpenMP 6.0 features -and their implementation status. Please post on the -`Discourse forums (Runtimes - OpenMP category)`_ for more -information or if you want to help with the -implementation. - -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -|Feature | C/C++ Status | Fortran Status | Reviews | -+=============================================================+===========================+===========================+==========================================================================+ -| free-agent threads | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| threadset clause | :`worked on` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Recording of task graphs | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Parallel inductions | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| init_complete for scan directive | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Loop transformation constructs | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| loop stripe transformation | :good:`done` | https://github.com/llvm/llvm-project/pull/119891 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| work distribute construct | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| task_iteration | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| memscope clause for atomic and flush | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| transparent clause (hull tasks) | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| rule-based compound directives | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| C23, C++23 | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Fortran 2023 | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| decl attribute for declarative directives | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| C attribute syntax | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| pure directives in DO CONCURRENT | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Optional argument for all clauses | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Function references for locator list items | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| All clauses accept directive name modifier | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Extensions to depobj construct | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Extensions to atomic construct | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Private reductions | :good:`mostly` | :none:`unclaimed` | Parse/Sema:https://github.com/llvm/llvm-project/pull/129938 | -| | | | Codegen: https://github.com/llvm/llvm-project/pull/134709 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Self maps | :part:`partial` | :none:`unclaimed` | parsing/sema done: https://github.com/llvm/llvm-project/pull/129888 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Release map type for declare mapper | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Extensions to interop construct | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| no_openmp_constructs | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125933 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| safe_sync and progress with identifier and API | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| OpenMP directives in concurrent loop regions | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125621 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| atomics constructs on concurrent loop regions | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125621 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Loop construct with DO CONCURRENT | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| device_type clause for target construct | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| nowait for ancestor target directives | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| New API for devices' num_teams/thread_limit | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Host and device environment variables | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| num_threads ICV and clause accepts list | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Numeric names for environment variables | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Increment between places for OMP_PLACES | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| OMP_AVAILABLE_DEVICES envirable | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Traits for default device envirable | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Optionally omit array length expression | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Canonical loop sequences | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Clarifications to Fortran map semantics | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| default clause at target construct | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| ref count update use_device_{ptr, addr} | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Clarifications to implicit reductions | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| ref modifier for map clauses | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| map-type modifiers in arbitrary position | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/90499 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Lift nesting restriction on concurrent loop | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125621 | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| priority clause for target constructs | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| changes to target_data construct | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ -| Non-const do_not_sync for nowait/nogroup | :none:`unclaimed` | :none:`unclaimed` | | -+-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+ - -OpenMP Extensions -================= - -The following table provides a quick overview over various OpenMP -extensions and their implementation status. These extensions are not -currently defined by any standard, so links to associated LLVM -documentation are provided. As these extensions mature, they will be -considered for standardization. Please post on the -`Discourse forums (Runtimes - OpenMP category)`_ to provide feedback. - -+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+ -|Category | Feature | Status | Reviews | -+==============================+===================================================================================+==========================+========================================================+ -| atomic extension | `'atomic' strictly nested within 'teams' | :good:`prototyped` | D126323 | -| | <https://openmp.llvm.org/docs/openacc/OpenMPExtensions.html#atomicWithinTeams>`_ | | | -+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+ -| device extension | `'ompx_hold' map type modifier | :good:`prototyped` | D106509, D106510 | -| | <https://openmp.llvm.org/docs/openacc/OpenMPExtensions.html#ompx-hold>`_ | | | -+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+ -| device extension | `'ompx_bare' clause on 'target teams' construct | :good:`prototyped` | #66844, #70612 | -| | <https://www.osti.gov/servlets/purl/2205717>`_ | | | -+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+ -| device extension | Multi-dim 'num_teams' and 'thread_limit' clause on 'target teams ompx_bare' | :good:`partial` | #99732, #101407, #102715 | -| | construct | | | -+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+ - -.. _Discourse forums (Runtimes - OpenMP category): https://discourse.llvm.org/c/runtimes/openmp/35 +.. raw:: html
+
+ <style type="text/css">
+ .none { background-color: #FFCCCC }
+ .part { background-color: #FFFF99 }
+ .good { background-color: #CCFF99 }
+ </style>
+
+.. role:: none
+.. role:: part
+.. role:: good
+
+.. contents::
+ :local:
+
+==============
+OpenMP Support
+==============
+
+Clang fully supports OpenMP 4.5, almost all of 5.0 and most of 5.1/2.
+Clang supports offloading to X86_64, AArch64, PPC64[LE], NVIDIA GPUs (all models) and AMD GPUs (all models).
+
+In addition, the LLVM OpenMP runtime `libomp` supports the OpenMP Tools
+Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and macOS.
+OMPT is also supported for NVIDIA and AMD GPUs.
+
+For the list of supported features from OpenMP 5.0 and 5.1
+see `OpenMP implementation details`_ and `OpenMP 51 implementation details`_.
+
+General improvements
+====================
+- New collapse clause scheme to avoid expensive remainder operations.
+ Compute loop index variables after collapsing a loop nest via the
+ collapse clause by replacing the expensive remainder operation with
+ multiplications and additions.
+
+- When using the collapse clause on a loop nest the default behavior
+ is to automatically extend the representation of the loop counter to
+ 64 bits for the cases where the sizes of the collapsed loops are not
+ known at compile time. To prevent this conservative choice and use
+ at most 32 bits, compile your program with the
+ `-fopenmp-optimistic-collapse`.
+
+
+GPU devices support
+===================
+
+Data-sharing modes
+------------------
+
+Clang supports two data-sharing models for Cuda devices: `Generic` and `Cuda`
+modes. The default mode is `Generic`. `Cuda` mode can give an additional
+performance and can be activated using the `-fopenmp-cuda-mode` flag. In
+`Generic` mode all local variables that can be shared in the parallel regions
+are stored in the global memory. In `Cuda` mode local variables are not shared
+between the threads and it is user responsibility to share the required data
+between the threads in the parallel regions. Often, the optimizer is able to
+reduce the cost of `Generic` mode to the level of `Cuda` mode, but the flag,
+as well as other assumption flags, can be used for tuning.
+
+Features not supported or with limited support for Cuda devices
+---------------------------------------------------------------
+
+- Cancellation constructs are not supported.
+
+- Doacross loop nest is not supported.
+
+- User-defined reductions are supported only for trivial types.
+
+- Nested parallelism: inner parallel regions are executed sequentially.
+
+- Debug information for OpenMP target regions is supported, but sometimes it may
+ be required to manually specify the address class of the inspected variables.
+ In some cases the local variables are actually allocated in the global memory,
+ but the debug info may be not aware of it.
+
+
+.. _OpenMP implementation details:
+
+OpenMP 5.0 Implementation Details
+=================================
+
+The following table provides a quick overview over various OpenMP 5.0 features
+and their implementation status. Please post on the
+`Discourse forums (Runtimes - OpenMP category)`_ for more
+information or if you want to help with the
+implementation.
+
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+|Category | Feature | Status | Reviews |
++==============================+==============================================================+==========================+=======================================================================+
+| loop | support != in the canonical loop form | :good:`done` | D54441 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | #pragma omp loop (directive) | :part:`partial` | D145823 (combined forms) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | #pragma omp loop bind | :part:`worked on` | D144634 (needs review) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | collapse imperfectly nested loop | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | collapse non-rectangular nested loop | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | C++ range-base for loop | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | clause: if for SIMD directives | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | inclusive scan (matching C++17 PSTL) | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory management | memory allocators | :good:`done` | r341687,r357929 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory management | allocate directive and allocate clause | :good:`done` | r355614,r335952 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| OMPD | OMPD interfaces | :good:`done` | https://reviews.llvm.org/D99914 (Supports only HOST(CPU) and Linux |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| OMPT | OMPT interfaces (callback support) | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| thread affinity | thread affinity | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | taskloop reduction | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | task affinity | :part:`not upstream` | https://github.com/jklinkenberg/openmp/tree/task-affinity |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | clause: depend on the taskwait construct | :good:`done` | D113540 (regular codegen only) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | depend objects and detachable tasks | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | mutexinoutset dependence-type for tasks | :good:`done` | D53380,D57576 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | combined taskloop constructs | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | master taskloop | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | parallel master taskloop | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | master taskloop simd | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | parallel master taskloop simd | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| SIMD | atomic and simd constructs inside SIMD code | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| SIMD | SIMD nontemporal | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | infer target functions from initializers | :part:`worked on` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | infer target variables from initializers | :good:`done` | D146418 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | OMP_TARGET_OFFLOAD environment variable | :good:`done` | D50522 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | support full 'defaultmap' functionality | :good:`done` | D69204 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | device specific functions | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: device_type | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: extended device | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: uses_allocators clause | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: in_reduction | :part:`worked on` | r308768 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | omp_get_device_num() | :good:`done` | D54342,D128347 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | structure mapping of references | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | nested target declare | :good:`done` | D51378 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | implicitly map 'this' (this[:1]) | :good:`done` | D55982 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | allow access to the reference count (omp_target_is_present) | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | requires directive | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: unified_shared_memory | :good:`done` | D52625,D52359 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: unified_address | :part:`partial` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: reverse_offload | :part:`partial` | D52780,D155003 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: atomic_default_mem_order | :good:`done` | D53513 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: dynamic_allocators | :part:`unclaimed parts` | D53079 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | user-defined mappers | :good:`done` | D56326,D58638,D58523,D58074,D60972,D59474 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | map array-section with implicit mapper | :good:`done` | https://github.com/llvm/llvm-project/pull/101101 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | mapping lambda expression | :good:`done` | D51107 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | clause: use_device_addr for target data | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | support close modifier on map clause | :good:`done` | D55719,D55892 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | teams construct on the host device | :good:`done` | r371553 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | support non-contiguous array sections for target update | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | pointer attachment | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| atomic | hints for the atomic construct | :good:`done` | D51233 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| base language | C11 support | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| base language | C++11/14/17 support | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| base language | lambda support | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | array shaping | :good:`done` | D74144 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | library shutdown (omp_pause_resource[_all]) | :good:`done` | D55078 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | metadirectives | :part:`mostly done` | D91944, https://github.com/llvm/llvm-project/pull/128640 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | conditional modifier for lastprivate clause | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | iterator and multidependences | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | depobj directive and depobj dependency kind | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | user-defined function variants | :good:`done`. | D67294, D64095, D71847, D71830, D109635 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | pointer/reference to pointer based array reductions | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | prevent new type definitions in clauses | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory model | memory model update (seq_cst, acq_rel, release, acquire,...) | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+
+
+.. _OpenMP 51 implementation details:
+
+OpenMP 5.1 Implementation Details
+=================================
+
+The following table provides a quick overview over various OpenMP 5.1 features
+and their implementation status.
+Please post on the
+`Discourse forums (Runtimes - OpenMP category)`_ for more
+information or if you want to help with the
+implementation.
+
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+|Category | Feature | Status | Reviews |
++==============================+==============================================================+==========================+=======================================================================+
+| atomic | 'compare' clause on atomic construct | :good:`done` | D120290, D120007, D118632, D120200, D116261, D118547, D116637 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| atomic | 'fail' clause on atomic construct | :part:`worked on` | D123235 (in progress) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| base language | C++ attribute specifier syntax | :good:`done` | D105648 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | 'present' map type modifier | :good:`done` | D83061, D83062, D84422 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | 'present' motion modifier | :good:`done` | D84711, D84712 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | 'present' in defaultmap clause | :good:`done` | D92427 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | map clause reordering based on 'present' modifier | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | device-specific environment variables | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | omp_target_is_accessible routine | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | omp_get_mapped_ptr routine | :good:`done` | D141545 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | new async target memory copy routines | :good:`done` | D136103 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | thread_limit clause on target construct | :part:`partial` | D141540 (offload), D152054 (host, in progress) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | has_device_addr clause on target construct | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | iterators in map clause or motion clauses | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | indirect clause on declare target directive | :part:`In Progress` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | allow virtual functions calls for mapped object on device | :part:`partial` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | interop construct | :part:`partial` | parsing/sema done: D98558, D98834, D98815 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| device | assorted routines for querying interoperable properties | :part:`partial` | D106674 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | Loop tiling transformation | :good:`done` | D76342 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | Loop unrolling transformation | :good:`done` | D99459 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| loop | 'reproducible'/'unconstrained' modifiers in 'order' clause | :part:`partial` | D127855 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory management | alignment for allocate directive and clause | :good:`done` | D115683 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory management | 'allocator' modifier for allocate clause | :good:`done` | https://github.com/llvm/llvm-project/pull/114883 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory management | 'align' modifier for allocate clause | :good:`done` | https://github.com/llvm/llvm-project/pull/121814 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory management | new memory management routines | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory management | changes to omp_alloctrait_key enum | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| memory model | seq_cst clause on flush construct | :good:`done` | https://github.com/llvm/llvm-project/pull/114072 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | 'omp_all_memory' keyword and use in 'depend' clause | :good:`done` | D125828, D126321 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | error directive | :good:`done` | D139166 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | scope construct | :good:`done` | D157933, https://github.com/llvm/llvm-project/pull/109197 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | routines for controlling and querying team regions | :part:`partial` | D95003 (libomp only) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | changes to ompt_scope_endpoint_t enum | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | omp_display_env routine | :good:`done` | D74956 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | extended OMP_PLACES syntax | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | OMP_NUM_TEAMS and OMP_TEAMS_THREAD_LIMIT env vars | :good:`done` | D138769 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | 'target_device' selector in context specifier | :none:`worked on` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | begin/end declare variant | :good:`done` | D71179 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | dispatch construct and function variant argument adjustment | :part:`worked on` | D99537, D99679 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | assumes directives | :part:`worked on` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | assume directive | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | nothing directive | :good:`done` | D123286 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | masked construct and related combined constructs | :good:`done` | D99995, D100514, PR-121741(parallel_masked_taskloop) |
+| | | | PR-121746(parallel_masked_task_loop_simd),PR-121914(masked_taskloop) |
+| | | | PR-121916(masked_taskloop_simd) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| misc | default(firstprivate) & default(private) | :good:`done` | D75591 (firstprivate), D125912 (private) |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| other | deprecating master construct | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| OMPT | new barrier types added to ompt_sync_region_t enum | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| OMPT | async data transfers added to ompt_target_data_op_t enum | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| OMPT | new barrier state values added to ompt_state_t enum | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| OMPT | new 'emi' callbacks for external monitoring interfaces | :good:`done` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| OMPT | device tracing interface | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | 'strict' modifier for taskloop construct | :none:`unclaimed` | |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | inoutset in depend clause | :good:`done` | D97085, D118383 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+| task | nowait clause on taskwait | :part:`partial` | parsing/sema done: D131830, D141531 |
++------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
+
+
+.. _OpenMP 6.0 implementation details:
+
+OpenMP 6.0 Implementation Details
+=================================
+
+The following table provides a quick overview over various OpenMP 6.0 features
+and their implementation status. Please post on the
+`Discourse forums (Runtimes - OpenMP category)`_ for more
+information or if you want to help with the
+implementation.
+
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+|Feature | C/C++ Status | Fortran Status | Reviews |
++=============================================================+===========================+===========================+==========================================================================+
+| free-agent threads | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| threadset clause | :`worked on` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Recording of task graphs | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Parallel inductions | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| init_complete for scan directive | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Loop transformation constructs | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| loop stripe transformation | :good:`done` | https://github.com/llvm/llvm-project/pull/119891 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| work distribute construct | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| task_iteration | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| memscope clause for atomic and flush | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| transparent clause (hull tasks) | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| rule-based compound directives | :none:`unclaimed` | :part:`In Progress` | Testing for Fortran missing |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| C23, C++23 | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Fortran 2023 | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| decl attribute for declarative directives | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| C attribute syntax | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| pure directives in DO CONCURRENT | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Optional argument for all clauses | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Function references for locator list items | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| All clauses accept directive name modifier | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Extensions to depobj construct | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Extensions to atomic construct | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Private reductions | :good:`mostly` | :none:`unclaimed` | Parse/Sema:https://github.com/llvm/llvm-project/pull/129938 |
+| | | | Codegen: https://github.com/llvm/llvm-project/pull/134709 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Self maps | :part:`partial` | :none:`unclaimed` | parsing/sema done: https://github.com/llvm/llvm-project/pull/129888 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Release map type for declare mapper | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Extensions to interop construct | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| no_openmp_constructs | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125933 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| safe_sync and progress with identifier and API | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| OpenMP directives in concurrent loop regions | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125621 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| atomics constructs on concurrent loop regions | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125621 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Loop construct with DO CONCURRENT | :none:`unclaimed` | :part:`In Progress` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| device_type clause for target construct | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| nowait for ancestor target directives | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| New API for devices' num_teams/thread_limit | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Host and device environment variables | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| num_threads ICV and clause accepts list | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Numeric names for environment variables | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Increment between places for OMP_PLACES | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| OMP_AVAILABLE_DEVICES envirable | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Traits for default device envirable | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Optionally omit array length expression | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/148048 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Canonical loop sequences | :none:`unclaimed` | :part:`In Progress` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Clarifications to Fortran map semantics | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| default clause at target construct | :part:`In Progress` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| ref count update use_device_{ptr, addr} | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Clarifications to implicit reductions | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| ref modifier for map clauses | :part:`In Progress` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| map-type modifiers in arbitrary position | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/90499 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Lift nesting restriction on concurrent loop | :good:`done` | :none:`unclaimed` | https://github.com/llvm/llvm-project/pull/125621 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| priority clause for target constructs | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| changes to target_data construct | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Non-const do_not_sync for nowait/nogroup | :none:`unclaimed` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| need_device_addr modifier for adjust_args clause | :part:`partial` | :none:`unclaimed` | Parsing/Sema: https://github.com/llvm/llvm-project/pull/143442 |
+| | | | https://github.com/llvm/llvm-project/pull/149586 |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Prescriptive num_threads | :part:`In Progress` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Message and severity clauses | :part:`In Progress` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Local clause on declare target | :part:`In Progress` | :none:`unclaimed` | |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+
+OpenMP Extensions
+=================
+
+The following table provides a quick overview over various OpenMP
+extensions and their implementation status. These extensions are not
+currently defined by any standard, so links to associated LLVM
+documentation are provided. As these extensions mature, they will be
+considered for standardization. Please post on the
+`Discourse forums (Runtimes - OpenMP category)`_ to provide feedback.
+
++------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
+|Category | Feature | Status | Reviews |
++==============================+===================================================================================+==========================+========================================================+
+| atomic extension | `'atomic' strictly nested within 'teams' | :good:`prototyped` | D126323 |
+| | <https://openmp.llvm.org/docs/openacc/OpenMPExtensions.html#atomicWithinTeams>`_ | | |
++------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
+| device extension | `'ompx_hold' map type modifier | :good:`prototyped` | D106509, D106510 |
+| | <https://openmp.llvm.org/docs/openacc/OpenMPExtensions.html#ompx-hold>`_ | | |
++------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
+| device extension | `'ompx_bare' clause on 'target teams' construct | :good:`prototyped` | #66844, #70612 |
+| | <https://www.osti.gov/servlets/purl/2205717>`_ | | |
++------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
+| device extension | Multi-dim 'num_teams' and 'thread_limit' clause on 'target teams ompx_bare' | :good:`partial` | #99732, #101407, #102715 |
+| | construct | | |
++------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
+
+.. _Discourse forums (Runtimes - OpenMP category): https://discourse.llvm.org/c/runtimes/openmp/35
|