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| OpenMP Support |
| ============== |
| |
| Clang fully supports OpenMP 4.5. Clang supports offloading to X86_64, AArch64, |
| PPC64[LE] and has `basic support for Cuda devices`_. |
| |
| * #pragma omp declare simd: :part:`Partial`. We support parsing/semantic |
| analysis + generation of special attributes for X86 target, but still |
| missing the LLVM pass for vectorization. |
| |
| 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. |
| |
| For the list of supported features from OpenMP 5.0 see `OpenMP 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. |
| |
| - The default schedules for the `distribute` and `for` constructs in a |
| parallel region and in SPMD mode have changed to ensure coalesced |
| accesses. For the `distribute` construct, a static schedule is used |
| with a chunk size equal to the number of threads per team (default |
| value of threads or as specified by the `thread_limit` clause if |
| present). For the `for` construct, the schedule is static with chunk |
| size of one. |
| |
| - Simplified SPMD code generation for `distribute parallel for` when |
| the new default schedules are applicable. |
| |
| - 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`. |
| |
| .. _basic support for Cuda devices: |
| |
| Cuda devices support |
| ==================== |
| |
| Directives execution modes |
| -------------------------- |
| |
| Clang code generation for target regions supports two modes: the SPMD and |
| non-SPMD modes. Clang chooses one of these two modes automatically based on the |
| way directives and clauses on those directives are used. The SPMD mode uses a |
| simplified set of runtime functions thus increasing performance at the cost of |
| supporting some OpenMP features. The non-SPMD mode is the most generic mode and |
| supports all currently available OpenMP features. The compiler will always |
| attempt to use the SPMD mode wherever possible. SPMD mode will not be used if: |
| |
| - The target region contains user code (other than OpenMP-specific |
| directives) in between the `target` and the `parallel` directives. |
| |
| 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. |
| |
| |
| 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. |
| |
| - Static linking of libraries containing device code is not supported yet. |
| |
| - Automatic translation of math functions in target regions to device-specific |
| math functions is not implemented yet. |
| |
| - 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 contact *openmp-dev* at |
| *lists.llvm.org* for more information or if you want to help with the |
| implementation. |
| |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| |Category | Feature | Status | Reviews | |
| +==============================+==============================================================+==========================+=======================================================================+ |
| | loop extension | support != in the canonical loop form | :good:`done` | D54441 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | #pragma omp loop (directive) | :part:`worked on` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | collapse imperfectly nested loop | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | collapse non-rectangular nested loop | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | C++ range-base for loop | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | clause: if for SIMD directives | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | inclusive scan extension (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 | :part:`not upstream` | https://github.com/OpenMPToolsInterface/LLVM-openmp/tree/ompd-tests | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | OMPT | OMPT interfaces | :part:`mostly done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | thread affinity extension | thread affinity extension | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | taskloop reduction | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | task affinity | :part:`not upstream` | https://github.com/jklinkenberg/openmp/tree/task-affinity | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | clause: depend on the taskwait construct | :part:`mostly done` | D113540 (regular codegen only) | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | depend objects and detachable tasks | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | mutexinoutset dependence-type for tasks | :good:`done` | D53380,D57576 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | combined taskloop constructs | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | master taskloop | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | parallel master taskloop | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | master taskloop simd | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | parallel master taskloop simd | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | SIMD extension | atomic and simd constructs inside SIMD code | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | SIMD extension | SIMD nontemporal | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | infer target functions from initializers | :part:`worked on` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | infer target variables from initializers | :part:`worked on` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | OMP_TARGET_OFFLOAD environment variable | :good:`done` | D50522 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | support full 'defaultmap' functionality | :good:`done` | D69204 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | device specific functions | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: device_type | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: extended device | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: uses_allocators clause | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: in_reduction | :part:`worked on` | r308768 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | omp_get_device_num() | :part:`worked on` | D54342 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | structure mapping of references | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | nested target declare | :good:`done` | D51378 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | implicitly map 'this' (this[:1]) | :good:`done` | D55982 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | allow access to the reference count (omp_target_is_present) | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | requires directive | :part:`partial` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: unified_shared_memory | :good:`done` | D52625,D52359 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: unified_address | :part:`partial` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: reverse_offload | :none:`unclaimed parts` | D52780 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: atomic_default_mem_order | :good:`done` | D53513 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: dynamic_allocators | :part:`unclaimed parts` | D53079 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | user-defined mappers | :part:`worked on` | D56326,D58638,D58523,D58074,D60972,D59474 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | mapping lambda expression | :good:`done` | D51107 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | clause: use_device_addr for target data | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | support close modifier on map clause | :good:`done` | D55719,D55892 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | teams construct on the host device | :part:`done` | r371553 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | support non-contiguous array sections for target update | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | pointer attachment | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | map clause reordering based on map types | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | atomic extension | 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 extension | array shaping | :good:`done` | D74144 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | library shutdown (omp_pause_resource[_all]) | :none:`unclaimed parts` | D55078 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | metadirectives | :part:`worked on` | D91944 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | conditional modifier for lastprivate clause | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | iterator and multidependences | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | depobj directive and depobj dependency kind | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | user-defined function variants | :part:`worked on` | D67294, D64095, D71847, D71830, D109635 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | pointer/reference to pointer based array reductions | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | prevent new type definitions in clauses | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | memory model extension | memory model update (seq_cst, acq_rel, release, acquire,...) | :good:`done` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| |
| |
| OpenMP 5.1 Implementation Details |
| ================================= |
| |
| The following table provides a quick overview over various OpenMP 5.1 features |
| and their implementation status, as defined in the technical report 8 (TR8). |
| Please contact *openmp-dev* at *lists.llvm.org* for more information or if you |
| want to help with the implementation. |
| |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| |Category | Feature | Status | Reviews | |
| +==============================+==============================================================+==========================+=======================================================================+ |
| | atomic extension | 'compare' clause on atomic construct | :good:`worked on` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | atomic extension | 'fail' clause on atomic construct | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | base language | C++ attribute specifier syntax | :good:`done` | D105648 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | 'present' map type modifier | :good:`done` | D83061, D83062, D84422 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | 'present' motion modifier | :good:`done` | D84711, D84712 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | 'present' in defaultmap clause | :good:`done` | D92427 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | map clause reordering reordering based on 'present' modifier | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | device-specific environment variables | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | omp_target_is_accessible routine | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | omp_get_mapped_ptr routine | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | new async target memory copy routines | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | thread_limit clause on target construct | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | has_device_addr clause on target construct | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | iterators in map clause or motion clauses | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | indirect clause on declare target directive | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | allow virtual functions calls for mapped object on device | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | interop construct | :part:`partial` | parsing/sema done: D98558, D98834, D98815 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | device extension | assorted routines for querying interoperable properties | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | Loop tiling transformation | :good:`done` | D76342 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | Loop unrolling transformation | :good:`done` | D99459 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | loop extension | 'reproducible'/'unconstrained' modifiers in 'order' clause | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | memory management | alignment extensions for allocate directive and clause | :part:`worked on` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | memory management | new memory management routines | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | memory management | changes to omp_alloctrait_key enum | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | memory model extension | seq_cst clause on flush construct | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | 'omp_all_memory' keyword and use in 'depend' clause | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | error directive | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | scope construct | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | routines for controlling and querying team regions | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | changes to ompt_scope_endpoint_t enum | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | omp_display_env routine | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | extended OMP_PLACES syntax | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | OMP_NUM_TEAMS and OMP_TEAMS_THREAD_LIMIT env vars | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | 'target_device' selector in context specifier | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | begin/end declare variant | :good:`done` | D71179 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | dispatch construct and function variant argument adjustment | :part:`worked on` | D99537, D99679 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | assume and assumes directives | :part:`worked on` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | nothing directive | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | masked construct and related combined constructs | :part:`worked on` | D99995, D100514 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | misc extension | default(firstprivate) & default(private) | :part:`partial` | firstprivate done: D75591 | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | 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 | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | 'strict' modifier for taskloop construct | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | inoutset in depend clause | :none:`unclaimed` | | |
| +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+ |
| | task extension | nowait clause on taskwait | :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 contact *openmp-dev* at |
| *lists.llvm.org* to provide feedback. |
| |
| +------------------------------+---------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+ |
| |Category | Feature | Status | Reviews | |
| +==============================+===========================================================================+==========================+========================================================+ |
| | device extension | `'ompx_hold' map type modifier | :good:`prototyped` | D106509, D106510 | |
| | | <https://openmp.llvm.org/docs/openacc/OpenMPExtensions.html#ompx-hold>`_ | | | |
| +------------------------------+---------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+ |
