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15
16OpenMP Support
17==============
18
19Clang fully supports OpenMP 4.5. Clang supports offloading to X86_64, AArch64,
20PPC64[LE] and has `basic support for Cuda devices`_.
21
22* #pragma omp declare simd: :part:`Partial`.  We support parsing/semantic
23  analysis + generation of special attributes for X86 target, but still
24  missing the LLVM pass for vectorization.
25
26In addition, the LLVM OpenMP runtime `libomp` supports the OpenMP Tools
27Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and macOS.
28
29For the list of supported features from OpenMP 5.0 see `OpenMP implementation details`_.
30
31General improvements
32====================
33- New collapse clause scheme to avoid expensive remainder operations.
34  Compute loop index variables after collapsing a loop nest via the
35  collapse clause by replacing the expensive remainder operation with
36  multiplications and additions.
37
38- The default schedules for the `distribute` and `for` constructs in a
39  parallel region and in SPMD mode have changed to ensure coalesced
40  accesses. For the `distribute` construct, a static schedule is used
41  with a chunk size equal to the number of threads per team (default
42  value of threads or as specified by the `thread_limit` clause if
43  present). For the `for` construct, the schedule is static with chunk
44  size of one.
45
46- Simplified SPMD code generation for `distribute parallel for` when
47  the new default schedules are applicable.
48
49- When using the collapse clause on a loop nest the default behavior
50  is to automatically extend the representation of the loop counter to
51  64 bits for the cases where the sizes of the collapsed loops are not
52  known at compile time. To prevent this conservative choice and use
53  at most 32 bits, compile your program with the
54  `-fopenmp-optimistic-collapse`.
55
56.. _basic support for Cuda devices:
57
58Cuda devices support
59====================
60
61Directives execution modes
62--------------------------
63
64Clang code generation for target regions supports two modes: the SPMD and
65non-SPMD modes. Clang chooses one of these two modes automatically based on the
66way directives and clauses on those directives are used. The SPMD mode uses a
67simplified set of runtime functions thus increasing performance at the cost of
68supporting some OpenMP features. The non-SPMD mode is the most generic mode and
69supports all currently available OpenMP features. The compiler will always
70attempt to use the SPMD mode wherever possible. SPMD mode will not be used if:
71
72   - The target region contains user code (other than OpenMP-specific
73     directives) in between the `target` and the `parallel` directives.
74
75Data-sharing modes
76------------------
77
78Clang supports two data-sharing models for Cuda devices: `Generic` and `Cuda`
79modes. The default mode is `Generic`. `Cuda` mode can give an additional
80performance and can be activated using the `-fopenmp-cuda-mode` flag. In
81`Generic` mode all local variables that can be shared in the parallel regions
82are stored in the global memory. In `Cuda` mode local variables are not shared
83between the threads and it is user responsibility to share the required data
84between the threads in the parallel regions.
85
86
87Features not supported or with limited support for Cuda devices
88---------------------------------------------------------------
89
90- Cancellation constructs are not supported.
91
92- Doacross loop nest is not supported.
93
94- User-defined reductions are supported only for trivial types.
95
96- Nested parallelism: inner parallel regions are executed sequentially.
97
98- Static linking of libraries containing device code is not supported yet.
99
100- Automatic translation of math functions in target regions to device-specific
101  math functions is not implemented yet.
102
103- Debug information for OpenMP target regions is supported, but sometimes it may
104  be required to manually specify the address class of the inspected variables.
105  In some cases the local variables are actually allocated in the global memory,
106  but the debug info may be not aware of it.
107
108
109.. _OpenMP implementation details:
110
111OpenMP 5.0 Implementation Details
112=================================
113
114The following table provides a quick overview over various OpenMP 5.0 features
115and their implementation status. Please contact *openmp-dev* at
116*lists.llvm.org* for more information or if you want to help with the
117implementation.
118
119+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
120|Category                      | Feature                                                      | Status                   | Reviews                                                               |
121+==============================+==============================================================+==========================+=======================================================================+
122| loop extension               | support != in the canonical loop form                        | :good:`done`             | D54441                                                                |
123+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
124| loop extension               | #pragma omp loop (directive)                                 | :part:`worked on`        |                                                                       |
125+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
126| loop extension               | collapse imperfectly nested loop                             | :good:`done`             |                                                                       |
127+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
128| loop extension               | collapse non-rectangular nested loop                         | :good:`done`             |                                                                       |
129+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
130| loop extension               | C++ range-base for loop                                      | :good:`done`             |                                                                       |
131+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
132| loop extension               | clause: if for SIMD directives                               | :good:`done`             |                                                                       |
133+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
134| loop extension               | inclusive scan extension (matching C++17 PSTL)               | :good:`done`             |                                                                       |
135+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
136| memory mangagement           | memory allocators                                            | :good:`done`             | r341687,r357929                                                       |
137+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
138| memory mangagement           | allocate directive and allocate clause                       | :good:`done`             | r355614,r335952                                                       |
139+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
140| OMPD                         | OMPD interfaces                                              | :part:`not upstream`     | https://github.com/OpenMPToolsInterface/LLVM-openmp/tree/ompd-tests   |
141+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
142| OMPT                         | OMPT interfaces                                              | :part:`mostly done`      |                                                                       |
143+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
144| thread affinity extension    | thread affinity extension                                    | :good:`done`             |                                                                       |
145+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
146| task extension               | taskloop reduction                                           | :good:`done`             |                                                                       |
147+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
148| task extension               | task affinity                                                | :part:`not upstream`     |                                                                       |
149+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
150| task extension               | clause: depend on the taskwait construct                     | :part:`worked on`        |                                                                       |
151+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
152| task extension               | depend objects and detachable tasks                          | :good:`done`             |                                                                       |
153+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
154| task extension               | mutexinoutset dependence-type for tasks                      | :good:`done`             | D53380,D57576                                                         |
155+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
156| task extension               | combined taskloop constructs                                 | :good:`done`             |                                                                       |
157+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
158| task extension               | master taskloop                                              | :good:`done`             |                                                                       |
159+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
160| task extension               | parallel master taskloop                                     | :good:`done`             |                                                                       |
161+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
162| task extension               | master taskloop simd                                         | :good:`done`             |                                                                       |
163+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
164| task extension               | parallel master taskloop simd                                | :good:`done`             |                                                                       |
165+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
166| SIMD extension               | atomic and simd constructs inside SIMD code                  | :good:`done`             |                                                                       |
167+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
168| SIMD extension               | SIMD nontemporal                                             | :good:`done`             |                                                                       |
169+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
170| device extension             | infer target functions from initializers                     | :part:`worked on`        |                                                                       |
171+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
172| device extension             | infer target variables from initializers                     | :part:`worked on`        |                                                                       |
173+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
174| device extension             | OMP_TARGET_OFFLOAD environment variable                      | :good:`done`             | D50522                                                                |
175+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
176| device extension             | support full 'defaultmap' functionality                      | :good:`done`             | D69204                                                                |
177+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
178| device extension             | device specific functions                                    | :good:`done`             |                                                                       |
179+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
180| device extension             | clause: device_type                                          | :good:`done`             |                                                                       |
181+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
182| device extension             | clause: extended device                                      | :good:`done`             |                                                                       |
183+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
184| device extension             | clause: uses_allocators clause                               | :good:`done`             |                                                                       |
185+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
186| device extension             | clause: in_reduction                                         | :part:`worked on`        | r308768                                                               |
187+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
188| device extension             | omp_get_device_num()                                         | :part:`worked on`        | D54342                                                                |
189+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
190| device extension             | structure mapping of references                              | :none:`unclaimed`        |                                                                       |
191+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
192| device extension             | nested target declare                                        | :good:`done`             | D51378                                                                |
193+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
194| device extension             | implicitly map 'this' (this[:1])                             | :good:`done`             | D55982                                                                |
195+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
196| device extension             | allow access to the reference count (omp_target_is_present)  | :part:`worked on`        |                                                                       |
197+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
198| device extension             | requires directive                                           | :part:`partial`          |                                                                       |
199+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
200| device extension             | clause: unified_shared_memory                                | :good:`done`             | D52625,D52359                                                         |
201+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
202| device extension             | clause: unified_address                                      | :part:`partial`          |                                                                       |
203+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
204| device extension             | clause: reverse_offload                                      | :none:`unclaimed parts`  | D52780                                                                |
205+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
206| device extension             | clause: atomic_default_mem_order                             | :good:`done`             | D53513                                                                |
207+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
208| device extension             | clause: dynamic_allocators                                   | :part:`unclaimed parts`  | D53079                                                                |
209+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
210| device extension             | user-defined mappers                                         | :part:`worked on`        | D56326,D58638,D58523,D58074,D60972,D59474                             |
211+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
212| device extension             | mapping lambda expression                                    | :good:`done`             | D51107                                                                |
213+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
214| device extension             | clause: use_device_addr for target data                      | :good:`done`             |                                                                       |
215+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
216| device extension             | support close modifier on map clause                         | :good:`done`             | D55719,D55892                                                         |
217+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
218| device extension             | teams construct on the host device                           | :part:`worked on`        | Clang part is done, r371553.                                          |
219+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
220| device extension             | support non-contiguous array sections for target update      | :good:`done`             |                                                                       |
221+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
222| device extension             | pointer attachment                                           | :none:`unclaimed`        |                                                                       |
223+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
224| device extension             | map clause reordering based on map types                     | :none:`unclaimed`        |                                                                       |
225+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
226| atomic extension             | hints for the atomic construct                               | :good:`done`             | D51233                                                                |
227+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
228| base language                | C11 support                                                  | :good:`done`             |                                                                       |
229+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
230| base language                | C++11/14/17 support                                          | :good:`done`             |                                                                       |
231+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
232| base language                | lambda support                                               | :good:`done`             |                                                                       |
233+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
234| misc extension               | array shaping                                                | :good:`done`             | D74144                                                                |
235+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
236| misc extension               | library shutdown (omp_pause_resource[_all])                  | :none:`unclaimed parts`  | D55078                                                                |
237+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
238| misc extension               | metadirectives                                               | :part:`worked on`        |                                                                       |
239+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
240| misc extension               | conditional modifier for lastprivate clause                  | :good:`done`             |                                                                       |
241+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
242| misc extension               | iterator and multidependences                                | :good:`done`             |                                                                       |
243+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
244| misc extension               | depobj directive and depobj dependency kind                  | :good:`done`             |                                                                       |
245+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
246| misc extension               | user-defined function variants                               | :part:`worked on`        | D67294, D64095, D71847, D71830                                        |
247+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
248| misc extension               | pointer/reference to pointer based array reductions          | :none:`unclaimed`        |                                                                       |
249+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
250| misc extension               | prevent new type definitions in clauses                      | :good:`done`             |                                                                       |
251+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
252| memory model extension       | memory model update (seq_cst, acq_rel, release, acquire,...) | :good:`done`             |                                                                       |
253+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
254
255
256OpenMP 5.1 Implementation Details
257=================================
258
259The following table provides a quick overview over various OpenMP 5.1 features
260and their implementation status, as defined in the technical report 8 (TR8).
261Please contact *openmp-dev* at *lists.llvm.org* for more information or if you
262want to help with the implementation.
263
264+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
265|Category                      | Feature                                                      | Status                   | Reviews                                                               |
266+==============================+==============================================================+==========================+=======================================================================+
267| atomic extension             | 'compare' and 'fail' clauses on atomic construct             | :none:`unclaimed`        |                                                                       |
268+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
269| base language                | C++ attribute specifier syntax                               | :none:`unclaimed`        |                                                                       |
270+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
271| device extension             | 'present' map type modifier                                  | :good:`done`             | D83061, D83062, D84422                                                |
272+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
273| device extension             | 'present' motion modifier                                    | :good:`done`             | D84711, D84712                                                        |
274+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
275| device extension             | 'present' in defaultmap clause                               | :part:`worked on`        | D92427                                                                |
276+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
277| device extension             | map clause reordering reordering based on 'present' modifier | :none:`unclaimed`        |                                                                       |
278+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
279| device extension             | device-specific environment variables                        | :none:`unclaimed`        |                                                                       |
280+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
281| device extension             | omp_target_is_accessible routine                             | :none:`unclaimed`        |                                                                       |
282+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
283| device extension             | omp_get_mapped_ptr routine                                   | :none:`unclaimed`        |                                                                       |
284+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
285| device extension             | new async target memory copy routines                        | :none:`unclaimed`        |                                                                       |
286+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
287| device extension             | thread_limit clause on target construct                      | :none:`unclaimed`        |                                                                       |
288+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
289| device extension             | has_device_addr clause on target construct                   | :none:`unclaimed`        |                                                                       |
290+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
291| device extension             | iterators in map clause or motion clauses                    | :none:`unclaimed`        |                                                                       |
292+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
293| device extension             | indirect clause on declare target directive                  | :none:`unclaimed`        |                                                                       |
294+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
295| device extension             | allow virtual functions calls for mapped object on device    | :none:`unclaimed`        |                                                                       |
296+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
297| device extension             | interop construct                                            | :none:`unclaimed`        |                                                                       |
298+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
299| device extension             | assorted routines for querying interoperable properties      | :none:`unclaimed`        |                                                                       |
300+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
301| loop extension               | Loop tiling transformation                                   | :part:`worked on`        | D76342                                                                |
302+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
303| loop extension               | Loop unrolling transformation                                | :none:`unclaimed`        |                                                                       |
304+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
305| loop extension               | 'reproducible'/'unconstrained' modifiers in 'order' clause   | :none:`unclaimed`        |                                                                       |
306+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
307| memory management            | alignment extensions for allocate directive and clause       | :none:`unclaimed`        |                                                                       |
308+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
309| memory management            | new memory management routines                               | :none:`unclaimed`        |                                                                       |
310+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
311| memory management            | changes to omp_alloctrait_key enum                           | :none:`unclaimed`        |                                                                       |
312+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
313| memory model extension       | seq_cst clause on flush construct                            | :none:`unclaimed`        |                                                                       |
314+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
315| misc extension               | 'omp_all_memory' keyword and use in 'depend' clause          | :none:`unclaimed`        |                                                                       |
316+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
317| misc extension               | error directive                                              | :none:`unclaimed`        |                                                                       |
318+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
319| misc extension               | scope construct                                              | :none:`unclaimed`        |                                                                       |
320+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
321| misc extension               | routines for controlling and querying team regions           | :none:`unclaimed`        |                                                                       |
322+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
323| misc extension               | changes to ompt_scope_endpoint_t enum                        | :none:`unclaimed`        |                                                                       |
324+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
325| misc extension               | omp_display_env routine                                      | :none:`unclaimed`        |                                                                       |
326+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
327| misc extension               | extended OMP_PLACES syntax                                   | :none:`unclaimed`        |                                                                       |
328+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
329| misc extension               | OMP_NUM_TEAMS and OMP_TEAMS_THREAD_LIMIT env vars            | :none:`unclaimed`        |                                                                       |
330+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
331| misc extension               | 'target_device' selector in context specifier                | :none:`unclaimed`        |                                                                       |
332+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
333| misc extension               | begin/end declare variant                                    | :good:`done`             | D71179                                                                |
334+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
335| misc extension               | dispatch construct and function variant argument adjustment  | :none:`unclaimed`        |                                                                       |
336+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
337| misc extension               | assume and assumes directives                                | :part:`worked on`        |                                                                       |
338+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
339| misc extension               | nothing directive                                            | :none:`unclaimed`        |                                                                       |
340+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
341| misc extension               | masked construct and related combined constructs             | :none:`unclaimed`        |                                                                       |
342+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
343| misc extension               | default(firstprivate) & default(private)                     | :part:`partial`          | firstprivate done: D75591                                             |
344+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
345| other                        | deprecating master construct                                 | :none:`unclaimed`        |                                                                       |
346+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
347| OMPT                         | new barrier types added to ompt_sync_region_t enum           | :none:`unclaimed`        |                                                                       |
348+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
349| OMPT                         | async data transfers added to ompt_target_data_op_t enum     | :none:`unclaimed`        |                                                                       |
350+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
351| OMPT                         | new barrier state values added to ompt_state_t enum          | :none:`unclaimed`        |                                                                       |
352+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
353| OMPT                         | new 'emi' callbacks for external monitoring interfaces       | :none:`unclaimed`        |                                                                       |
354+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
355| task extension               | 'strict' modifier for taskloop construct                     | :none:`unclaimed`        |                                                                       |
356+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
357| task extension               | inoutset in depend clause                                    | :none:`unclaimed`        |                                                                       |
358+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
359| task extension               | nowait clause on taskwait                                    | :none:`unclaimed`        |                                                                       |
360+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
361