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Diffstat (limited to 'docs/OpenMPSupport.rst')
| -rw-r--r-- | docs/OpenMPSupport.rst | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/docs/OpenMPSupport.rst b/docs/OpenMPSupport.rst index e8ec1e371b04..04a9648ca294 100644 --- a/docs/OpenMPSupport.rst +++ b/docs/OpenMPSupport.rst @@ -66,12 +66,11 @@ Combined directives * #pragma omp target teams distribute parallel for [simd]: :good:`Complete`. -Clang does not support any constructs/updates from upcoming OpenMP 5.0 except +Clang does not support any constructs/updates from OpenMP 5.0 except for `reduction`-based clauses in the `task` and `target`-based directives. 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. -ows, and mac OS. .. _basic support for Cuda devices: @@ -109,11 +108,19 @@ are stored in the global memory. In `Cuda` mode local variables are not shared between the threads and it is user responsibility to share the required data between the threads in the parallel regions. +Collapsed loop nest counter +--------------------------- + +When using the collapse clause on a loop nest the default behaviour is to +automatically extend the representation of the loop counter to 64 bits for +the cases where the sizes of the collapsed loops are not known at compile +time. To prevent this conservative choice and use at most 32 bits, +compile your program with the `-fopenmp-optimistic-collapse`. + + Features not supported or with limited support for Cuda devices --------------------------------------------------------------- -- Reductions across the teams are not supported yet. - - Cancellation constructs are not supported. - Doacross loop nest is not supported. |