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[OPENMP] Info about OpenMP Support in Users Manual, NFC. 

Differential Revision: http://reviews.llvm.org/D12152

llvm-svn: 245823
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Alexey Bataev 2015-08-24 05:31:10 +00:00
parent 5196a17d3c
commit ae8c17ef58
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clang/docs/UsersManual.rst
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@ -1852,6 +1852,32 @@ Objective-C Language Features
Objective-C++ Language Features
===============================
.. _openmp:
OpenMP Features
===============
Clang supports all OpenMP 3.1 directives and clauses. In addition, some
features of OpenMP 4.0 are supported. For example, ``#pragma omp simd``,
``#pragma omp for simd``, ``#pragma omp parallel for simd`` directives, extended
set of atomic constructs, ``proc_bind`` clause for all parallel-based
directives, ``depend`` clause for ``#pragma omp task`` directive (except for
array sections), ``#pragma omp cancel`` and ``#pragma omp cancellation point``
directives, and ``#pragma omp taskgroup`` directive.
OpenMP support is disabled by default. Use :option:`-fopenmp=libomp` to enable
it. Support for OpenMP can be disabled with :option:`-fno-openmp`.
Controlling implementation limits
---------------------------------
.. option:: -fopenmp-use-tls
Controls code generation for OpenMP threadprivate variables. In presence of
this option all threadprivate variables are generated the same way as thread
local variables, using TLS support. If :option:`-fno-openmp-use-tls`
is provided or target does not support TLS, code generation for threadprivate
variables relies on OpenMP runtime library.
.. _target_features: