2013-09-27 18:38:44 +08:00
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<title>OpenMP* : Support for the OpenMP language</title>
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<a href="http://llvm.org/">LLVM Home</a>
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<div class="submenu">
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<label>OpenMP Info</label>
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<a href="/index.html">About</a>
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<label>Quick Links</label>
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/openmp-dev">openmp-dev</a>
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2013-10-03 15:27:25 +08:00
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/openmp-commits">openmp-commits</a>
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<a href="http://llvm.org/bugs/">Bug Reports</a>
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<a href="http://llvm.org/svn/llvm-project/openmp/trunk/">Browse SVN</a>
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<a href="http://llvm.org/viewvc/llvm-project/openmp/trunk/">Browse ViewVC</a>
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<div id="content">
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<!--*********************************************************************-->
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2013-10-03 19:55:28 +08:00
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<h1>"OpenMP®" Support for the OpenMP language</h1>
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<!--*********************************************************************-->
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<p>The OpenMP subproject of LLVM is intended to contain all of the
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components required to build an executing OpenMP program that are
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outside the compiler itself. Support for OpenMP 3.1 in Clang is in the
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process of being promoted into the Clang mainline, and can be
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found at <a href="http://clang-omp.github.io/">OpenMP/Clang</a>.
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2013-09-27 18:38:44 +08:00
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</p>
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<p>Here you can find the code for the runtime library against which
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code compiled by the OpenMP/Clang compiler must be linked before it
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can run. This code is also available
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at <a href="http://openmprtl.org/">openmprtl.org</a>; we intend to
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keep the different sites in sync.
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2013-09-27 18:38:44 +08:00
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</p>
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2014-04-09 23:40:23 +08:00
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<p>Support for the parts of the OpenMP 4.0 language that are not
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associated with the "target" constructs are contained in the
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"runtime" directory. Support for offloading computation via the
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"target" directive is in the separate "offload" directory. That
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builds a library that provides the interfaces for transferring code
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and data to an attached computational device. Initial support here
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is for the Intel® Xeon Phi™ coprocessor, but work is
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beginning to support other attached computing devices, and the
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design is intended to be general. The README.txt in the "offload"
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directory describes how to build the offload library.
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</p>
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2013-09-27 18:38:44 +08:00
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<p>All of the code here is <a
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href="http://llvm.org/docs/DeveloperPolicy.html#license">dual licensed</a>
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under the MIT license and the UIUC License (a BSD-like license).
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The LICENSE.txt file at the top of the OpenMP project contains
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the license text and associated patent grants.
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</p>
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<!--=====================================================================-->
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<h2 id="goals">Features and Goals</h2>
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<!--=====================================================================-->
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<ul>
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<li>Correctness as defined by the
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<a href="http://www.openmp.org/mp-documents/OpenMP3.1.pdf">OpenMP
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3.1 standard (PDF)</a> now, and <a href="http://www.openmp.org/mp-documents/OpenMP4.0.0.pdf">OpenMP
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4.0 standard (PDF)</a> in the future.</li>
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<li>High performance.</li>
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<li>ABI compatibility with <a href="http://gcc.gnu.org">Gcc</a> and
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<a href="http://software.intel.com/en-us/intel-compilers">Intel's
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existing OpenMP compilers.</a>
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However, we are not currently (May 2014) compatible with gcc 4.9, since
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it has introduced new entrypoints with which we have not yet
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caught up...
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</li>
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</ul>
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<!--=====================================================================-->
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<h2 id="why">Why have the runtime code here?</h2>
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<!--=====================================================================-->
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<p>It makes sense to have the runtime sources in the same place
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(and with the same license) as the compiler.
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</p>
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<!--=====================================================================-->
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<h2 id="requirements">Platform Support</h2>
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<!--=====================================================================-->
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<p>The OpenMP runtime is known to work on 32 and 64 bit X86
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processors when compiled with either the Intel compiler or gcc, and also the Intel® Xeon Phi™ product family, when compiled with
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the Intel compiler.
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</p>
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2013-10-03 19:55:28 +08:00
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<p>A full OS compatibility matrix is in
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<a href="README.txt">README.txt</a>
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</p>
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<!--=====================================================================-->
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<h2 id="dir-structure">Status</h2>
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<!--=====================================================================-->
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2014-05-11 01:02:09 +08:00
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<p>The runtime can be built with gcc, icc or clang. However, note
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that a runtime built with clang cannot be guaranteed to work with
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OpenMP code compiled by the other compilers, since clang does not support
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a 128-bit float type, and cannot therefore generate the code used
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for reductions of that type (which may occur in user code compiled
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by the other compilers).
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2013-09-27 18:38:44 +08:00
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</p>
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2014-05-11 01:02:09 +08:00
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<p>The University of Houston has kindly contributed their test
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suite (in the "testsuite" directory). Integration and use of this
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for automatic testing remain to be done, but now the code is here
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work can begin.
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</p>
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<!--=====================================================================-->
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<h2>Get it and get involved!</h2>
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<!--=====================================================================-->
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<p>First please review our
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<a href="http://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>.
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<p>To check out the code, use:</p>
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<ul>
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<li><code>svn co http://llvm.org/svn/llvm-project/openmp/trunk openmp</code></li>
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</ul>
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<p>
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Next:
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</p>
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<ul>
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<li><code>cd openmp/runtime</code></li>
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<li><code>make compiler=gcc</code></li>
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</ul>
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<p>Full details of how to build are in the
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<a href="README.txt">README.txt</a>
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</p>
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<!--=====================================================================-->
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<h3>Notes</h3>
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<!--=====================================================================-->
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<p>
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</p>
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<p>Send discussions to the
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(<a href="http://lists.cs.uiuc.edu/mailman/listinfo/openmp-dev">OpenMP mailing list</a>).</p>
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<!--=====================================================================-->
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<h2>Design Documents</h2>
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<!--=====================================================================-->
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<ul>
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<li><a href="Reference.pdf">Runtime design (PDF)</a></li>
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</ul>
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2013-10-03 19:55:28 +08:00
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<!--=====================================================================-->
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<h2>Copyright notices</h2>
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<!--=====================================================================-->
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<ul>
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<li>
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The OpenMP name and the OpenMP logo are registered trademarks of the
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OpenMP Architecture Review Board.
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</li>
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<li>
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Intel is a trademark of Intel Corporation in the U.S. and/or other
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countries.
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</li>
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</ul>
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</div>
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</body>
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</html>
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