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110 lines
3.6 KiB
110 lines
3.6 KiB
.. title:: Welcome to the documentation of OpenMP in LLVM!
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.. note::
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This document is a work in progress and most of the expected content is not
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yet available. While you can expect changes, we always welcome feedback and
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additions. Please contact, e.g., through ``openmp-dev@lists.llvm.org``.
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.. toctree::
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:hidden:
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:maxdepth: 1
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LLVM/OpenMP Documentation <self>
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LLVM/OpenMP Design & Overview
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=============================
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OpenMP impacts various parts of the LLVM project, from the frontends (`Clang
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<https://clang.llvm.org/docs/OpenMPSupport.html>`_ and Flang), through
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middle-end :ref:`optimizations <llvm_openmp_optimizations>`, up to the
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multitude of available :ref:`OpenMP runtimes <openmp_runtimes>`.
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A high-level overview of OpenMP in LLVM can be found :doc:`here <design/Overview>`.
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.. toctree::
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:hidden:
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:maxdepth: 1
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design/Overview
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LLVM/OpenMP Optimizations
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=========================
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LLVM, since `version 11 <https://releases.llvm.org/download.html#11.0.0>`_ (12 Oct
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2020), has an :doc:`OpenMP-Aware optimization pass <optimizations/OpenMPOpt>`
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as well as the ability to :doc:`perform "scalar optimizations" across OpenMP region
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boundaries <optimizations/OpenMPUnawareOptimizations>`.
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In-depth discussion of the topic can be found :doc:`here <optimizations/Overview>`.
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.. toctree::
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:hidden:
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:maxdepth: 1
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optimizations/Overview
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LLVM/OpenMP Optimization Remarks
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================================
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LLVM has an elaborate ecosystem around `analysis and optimization remarks
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<https://llvm.org/docs/Remarks.html>`_ issues during
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compilation. The remarks can be enabled from the clang frontend `[1]`_ `[2]`_
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in various formats `[3]`_ `[4]`_ to be used by tools, i.a., `opt-viewer` or
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`llvm-opt-report` (dated).
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The OpenMP optimizations in LLVM have been developed with remark support as a
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priority. For a list of OpenMP specific remarks and more information on them,
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please refer to :doc:`remarks/OptimizationRemarks`.
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.. _`[1]`: https://clang.llvm.org/docs/UsersManual.html#options-to-emit-optimization-reports
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.. _`[2]`: https://clang.llvm.org/docs/ClangCommandLineReference.html#diagnostic-flags
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.. _`[3]`: https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-foptimization-record-file
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.. _`[4]`: https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang1-fsave-optimization-record
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+ `[1]`_ https://clang.llvm.org/docs/UsersManual.html#options-to-emit-optimization-reports
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+ `[2]`_ https://clang.llvm.org/docs/ClangCommandLineReference.html#diagnostic-flags
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+ `[3]`_ https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-foptimization-record-file
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+ `[4]`_ https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang1-fsave-optimization-record
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.. toctree::
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:hidden:
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:maxdepth: 1
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remarks/OptimizationRemarks
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Support, Getting Involved, and Frequently Asked Questions (FAQ)
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===============================================================
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Dealing with OpenMP can be complicated. For help with the setup of an OpenMP
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(offload) capable compiler toolchain, its usage, and common problems, consult
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the :doc:`Support and FAQ <SupportAndFAQ>` page.
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We also encourage everyone interested in OpenMP in LLVM to :doc:`get involved
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<SupportAndFAQ>`.
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.. toctree::
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:hidden:
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:maxdepth: 1
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SupportAndFAQ
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Release Notes
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=============
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The current (in-progress) release notes can be found :doc:`here <ReleaseNotes>` while
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release notes for releases, starting with LLVM 12, will be available on `the
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Download Page <https://releases.llvm.org/download.html>`_.
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.. toctree::
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:hidden:
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:maxdepth: 1
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In-Progress ReleaseNotes <ReleaseNotes>
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