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361 lines
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.. contents::
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:local:
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==============
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OpenMP Support
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==============
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Clang fully supports OpenMP 4.5, almost all of 5.0 and most of 5.1/2.
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Clang supports offloading to X86_64, AArch64, PPC64[LE], NVIDIA GPUs (all models) and AMD GPUs (all models).
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In addition, the LLVM OpenMP runtime `libomp` supports the OpenMP Tools
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Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and macOS.
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OMPT is also supported for NVIDIA and AMD GPUs.
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For the list of supported features from OpenMP 5.0 and 5.1
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see `OpenMP implementation details`_ and `OpenMP 51 implementation details`_.
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General improvements
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====================
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- New collapse clause scheme to avoid expensive remainder operations.
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Compute loop index variables after collapsing a loop nest via the
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collapse clause by replacing the expensive remainder operation with
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multiplications and additions.
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- When using the collapse clause on a loop nest the default behavior
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is to automatically extend the representation of the loop counter to
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64 bits for the cases where the sizes of the collapsed loops are not
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known at compile time. To prevent this conservative choice and use
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at most 32 bits, compile your program with the
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`-fopenmp-optimistic-collapse`.
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GPU devices support
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===================
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Data-sharing modes
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------------------
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Clang supports two data-sharing models for Cuda devices: `Generic` and `Cuda`
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modes. The default mode is `Generic`. `Cuda` mode can give an additional
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performance and can be activated using the `-fopenmp-cuda-mode` flag. In
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`Generic` mode all local variables that can be shared in the parallel regions
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are stored in the global memory. In `Cuda` mode local variables are not shared
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between the threads and it is user responsibility to share the required data
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between the threads in the parallel regions. Often, the optimizer is able to
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reduce the cost of `Generic` mode to the level of `Cuda` mode, but the flag,
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as well as other assumption flags, can be used for tuning.
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Features not supported or with limited support for Cuda devices
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---------------------------------------------------------------
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- Cancellation constructs are not supported.
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- Doacross loop nest is not supported.
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- User-defined reductions are supported only for trivial types.
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- Nested parallelism: inner parallel regions are executed sequentially.
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- Debug information for OpenMP target regions is supported, but sometimes it may
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be required to manually specify the address class of the inspected variables.
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In some cases the local variables are actually allocated in the global memory,
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but the debug info may be not aware of it.
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.. _OpenMP implementation details:
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OpenMP 5.0 Implementation Details
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=================================
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The following table provides a quick overview over various OpenMP 5.0 features
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and their implementation status. Please post on the
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`Discourse forums (Runtimes - OpenMP category)`_ for more
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information or if you want to help with the
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implementation.
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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|Category | Feature | Status | Reviews |
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+==============================+==============================================================+==========================+=======================================================================+
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| loop | support != in the canonical loop form | :good:`done` | D54441 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | #pragma omp loop (directive) | :part:`partial` | D145823 (combined forms) |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | #pragma omp loop bind | :part:`worked on` | D144634 (needs review) |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | collapse imperfectly nested loop | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | collapse non-rectangular nested loop | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | C++ range-base for loop | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | clause: if for SIMD directives | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | inclusive scan (matching C++17 PSTL) | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| memory management | memory allocators | :good:`done` | r341687,r357929 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| memory management | allocate directive and allocate clause | :good:`done` | r355614,r335952 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| OMPD | OMPD interfaces | :good:`done` | https://reviews.llvm.org/D99914 (Supports only HOST(CPU) and Linux |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| OMPT | OMPT interfaces (callback support) | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| thread affinity | thread affinity | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | taskloop reduction | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | task affinity | :part:`not upstream` | https://github.com/jklinkenberg/openmp/tree/task-affinity |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | clause: depend on the taskwait construct | :good:`done` | D113540 (regular codegen only) |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | depend objects and detachable tasks | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | mutexinoutset dependence-type for tasks | :good:`done` | D53380,D57576 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | combined taskloop constructs | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | master taskloop | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | parallel master taskloop | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | master taskloop simd | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | parallel master taskloop simd | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| SIMD | atomic and simd constructs inside SIMD code | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| SIMD | SIMD nontemporal | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | infer target functions from initializers | :part:`worked on` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | infer target variables from initializers | :good:`done` | D146418 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | OMP_TARGET_OFFLOAD environment variable | :good:`done` | D50522 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | support full 'defaultmap' functionality | :good:`done` | D69204 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | device specific functions | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: device_type | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: extended device | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: uses_allocators clause | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: in_reduction | :part:`worked on` | r308768 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | omp_get_device_num() | :good:`done` | D54342,D128347 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | structure mapping of references | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | nested target declare | :good:`done` | D51378 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | implicitly map 'this' (this[:1]) | :good:`done` | D55982 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | allow access to the reference count (omp_target_is_present) | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | requires directive | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: unified_shared_memory | :good:`done` | D52625,D52359 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: unified_address | :part:`partial` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: reverse_offload | :part:`partial` | D52780,D155003 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: atomic_default_mem_order | :good:`done` | D53513 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: dynamic_allocators | :part:`unclaimed parts` | D53079 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | user-defined mappers | :good:`done` | D56326,D58638,D58523,D58074,D60972,D59474 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | mapping lambda expression | :good:`done` | D51107 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | clause: use_device_addr for target data | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | support close modifier on map clause | :good:`done` | D55719,D55892 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | teams construct on the host device | :good:`done` | r371553 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | support non-contiguous array sections for target update | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | pointer attachment | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| atomic | hints for the atomic construct | :good:`done` | D51233 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| base language | C11 support | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| base language | C++11/14/17 support | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| base language | lambda support | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | array shaping | :good:`done` | D74144 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | library shutdown (omp_pause_resource[_all]) | :good:`done` | D55078 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | metadirectives | :part:`mostly done` | D91944 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | conditional modifier for lastprivate clause | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | iterator and multidependences | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | depobj directive and depobj dependency kind | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | user-defined function variants | :good:`done`. | D67294, D64095, D71847, D71830, D109635 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | pointer/reference to pointer based array reductions | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | prevent new type definitions in clauses | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| memory model | memory model update (seq_cst, acq_rel, release, acquire,...) | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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.. _OpenMP 51 implementation details:
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OpenMP 5.1 Implementation Details
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=================================
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The following table provides a quick overview over various OpenMP 5.1 features
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and their implementation status.
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Please post on the
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`Discourse forums (Runtimes - OpenMP category)`_ for more
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information or if you want to help with the
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implementation.
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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|Category | Feature | Status | Reviews |
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+==============================+==============================================================+==========================+=======================================================================+
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| atomic | 'compare' clause on atomic construct | :good:`done` | D120290, D120007, D118632, D120200, D116261, D118547, D116637 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| atomic | 'fail' clause on atomic construct | :part:`worked on` | D123235 (in progress) |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| base language | C++ attribute specifier syntax | :good:`done` | D105648 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | 'present' map type modifier | :good:`done` | D83061, D83062, D84422 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | 'present' motion modifier | :good:`done` | D84711, D84712 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | 'present' in defaultmap clause | :good:`done` | D92427 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | map clause reordering based on 'present' modifier | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | device-specific environment variables | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | omp_target_is_accessible routine | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | omp_get_mapped_ptr routine | :good:`done` | D141545 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | new async target memory copy routines | :good:`done` | D136103 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | thread_limit clause on target construct | :part:`partial` | D141540 (offload), D152054 (host, in progress) |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | has_device_addr clause on target construct | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | iterators in map clause or motion clauses | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | indirect clause on declare target directive | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | allow virtual functions calls for mapped object on device | :part:`partial` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | interop construct | :part:`partial` | parsing/sema done: D98558, D98834, D98815 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| device | assorted routines for querying interoperable properties | :part:`partial` | D106674 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | Loop tiling transformation | :good:`done` | D76342 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | Loop unrolling transformation | :good:`done` | D99459 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| loop | 'reproducible'/'unconstrained' modifiers in 'order' clause | :part:`partial` | D127855 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| memory management | alignment for allocate directive and clause | :good:`done` | D115683 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| memory management | new memory management routines | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| memory management | changes to omp_alloctrait_key enum | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| memory model | seq_cst clause on flush construct | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | 'omp_all_memory' keyword and use in 'depend' clause | :good:`done` | D125828, D126321 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | error directive | :good:`done` | D139166 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | scope construct | :none:`worked on` | D157933 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | routines for controlling and querying team regions | :part:`partial` | D95003 (libomp only) |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | changes to ompt_scope_endpoint_t enum | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | omp_display_env routine | :good:`done` | D74956 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | extended OMP_PLACES syntax | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | OMP_NUM_TEAMS and OMP_TEAMS_THREAD_LIMIT env vars | :good:`done` | D138769 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | 'target_device' selector in context specifier | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | begin/end declare variant | :good:`done` | D71179 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | dispatch construct and function variant argument adjustment | :part:`worked on` | D99537, D99679 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | assume and assumes directives | :part:`worked on` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | nothing directive | :good:`done` | D123286 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | masked construct and related combined constructs | :part:`worked on` | D99995, D100514 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| misc | default(firstprivate) & default(private) | :good:`done` | D75591 (firstprivate), D125912 (private) |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| other | deprecating master construct | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| OMPT | new barrier types added to ompt_sync_region_t enum | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| OMPT | async data transfers added to ompt_target_data_op_t enum | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| OMPT | new barrier state values added to ompt_state_t enum | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| OMPT | new 'emi' callbacks for external monitoring interfaces | :good:`done` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| OMPT | device tracing interface | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | 'strict' modifier for taskloop construct | :none:`unclaimed` | |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | inoutset in depend clause | :good:`done` | D97085, D118383 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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| task | nowait clause on taskwait | :part:`partial` | parsing/sema done: D131830, D141531 |
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+------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
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OpenMP Extensions
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=================
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The following table provides a quick overview over various OpenMP
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extensions and their implementation status. These extensions are not
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currently defined by any standard, so links to associated LLVM
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documentation are provided. As these extensions mature, they will be
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considered for standardization. Please post on the
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`Discourse forums (Runtimes - OpenMP category)`_ to provide feedback.
|
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|
+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
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|Category | Feature | Status | Reviews |
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+==============================+===================================================================================+==========================+========================================================+
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|
| atomic extension | `'atomic' strictly nested within 'teams' | :good:`prototyped` | D126323 |
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| | <https://openmp.llvm.org/docs/openacc/OpenMPExtensions.html#atomicWithinTeams>`_ | | |
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+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
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| device extension | `'ompx_hold' map type modifier | :good:`prototyped` | D106509, D106510 |
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| | <https://openmp.llvm.org/docs/openacc/OpenMPExtensions.html#ompx-hold>`_ | | |
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+------------------------------+-----------------------------------------------------------------------------------+--------------------------+--------------------------------------------------------+
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.. _Discourse forums (Runtimes - OpenMP category): https://discourse.llvm.org/c/runtimes/openmp/35
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