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Diffstat (limited to 'docs/OpenMPSupport.rst')
| -rw-r--r-- | docs/OpenMPSupport.rst | 76 |
1 files changed, 33 insertions, 43 deletions
diff --git a/docs/OpenMPSupport.rst b/docs/OpenMPSupport.rst index 04a9648ca2942..7b567c966ee53 100644 --- a/docs/OpenMPSupport.rst +++ b/docs/OpenMPSupport.rst @@ -17,60 +17,50 @@ OpenMP Support ================== -Clang fully supports OpenMP 4.5. Clang supports offloading to X86_64, AArch64, -PPC64[LE] and has `basic support for Cuda devices`_. - -Standalone directives -===================== - -* #pragma omp [for] simd: :good:`Complete`. - -* #pragma omp declare simd: :partial:`Partial`. We support parsing/semantic - analysis + generation of special attributes for X86 target, but still - missing the LLVM pass for vectorization. - -* #pragma omp taskloop [simd]: :good:`Complete`. - -* #pragma omp target [enter|exit] data: :good:`Complete`. - -* #pragma omp target update: :good:`Complete`. - -* #pragma omp target: :good:`Complete`. +Clang supports the following OpenMP 5.0 features -* #pragma omp declare target: :good:`Complete`. +* The `reduction`-based clauses in the `task` and `target`-based directives. -* #pragma omp teams: :good:`Complete`. +* Support relational-op != (not-equal) as one of the canonical forms of random + access iterator. -* #pragma omp distribute [simd]: :good:`Complete`. +* Support for mapping of the lambdas in target regions. -* #pragma omp distribute parallel for [simd]: :good:`Complete`. +* Parsing/sema analysis for the requires directive. -Combined directives -=================== +* Nested declare target directives. -* #pragma omp parallel for simd: :good:`Complete`. +* Make the `this` pointer implicitly mapped as `map(this[:1])`. -* #pragma omp target parallel: :good:`Complete`. +* The `close` *map-type-modifier*. -* #pragma omp target parallel for [simd]: :good:`Complete`. - -* #pragma omp target simd: :good:`Complete`. - -* #pragma omp target teams: :good:`Complete`. - -* #pragma omp teams distribute [simd]: :good:`Complete`. - -* #pragma omp target teams distribute [simd]: :good:`Complete`. - -* #pragma omp teams distribute parallel for [simd]: :good:`Complete`. - -* #pragma omp target teams distribute parallel for [simd]: :good:`Complete`. +Clang fully supports OpenMP 4.5. Clang supports offloading to X86_64, AArch64, +PPC64[LE] and has `basic support for Cuda devices`_. -Clang does not support any constructs/updates from OpenMP 5.0 except -for `reduction`-based clauses in the `task` and `target`-based directives. +* #pragma omp declare simd: :partial:`Partial`. We support parsing/semantic + analysis + generation of special attributes for X86 target, but still + missing the LLVM pass for vectorization. In addition, the LLVM OpenMP runtime `libomp` supports the OpenMP Tools -Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and mac OS. +Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and macOS. + +General improvements +-------------------- +- New collapse clause scheme to avoid expensive remainder operations. + Compute loop index variables after collapsing a loop nest via the + collapse clause by replacing the expensive remainder operation with + multiplications and additions. + +- The default schedules for the `distribute` and `for` constructs in a + parallel region and in SPMD mode have changed to ensure coalesced + accesses. For the `distribute` construct, a static schedule is used + with a chunk size equal to the number of threads per team (default + value of threads or as specified by the `thread_limit` clause if + present). For the `for` construct, the schedule is static with chunk + size of one. + +- Simplified SPMD code generation for `distribute parallel for` when + the new default schedules are applicable. .. _basic support for Cuda devices: |