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<title>OpenMP* : Support for the OpenMP language</title>
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<!--*********************************************************************-->
<h1>"OpenMP®" Support for the OpenMP language</h1>
<!--*********************************************************************-->
<p>The OpenMP subproject of LLVM is intended to contain all of the
components required to build an executing OpenMP program that are
outside the compiler itself. Support for OpenMP 3.1 in Clang is in the
process of being promoted into the Clang mainline, and can be
found at <a href="http://clang-omp.github.io/">OpenMP/Clang</a>.
</p>
<p>Here you can find the code for the runtime library against which
code compiled by the OpenMP/Clang compiler must be linked before it
can run. This code is also available
at <a href="http://openmprtl.org/">openmprtl.org</a>; we intend to
keep the different sites in sync.
</p>
<p>We are, however, still missing test code. Any contributions in
that area would be greatly appreciated!
</p>
<p>All of the code here is <a
href="http://llvm.org/docs/DeveloperPolicy.html#license">dual licensed</a>
under the MIT license and the UIUC License (a BSD-like license).
The LICENSE.txt file at the top of the OpenMP project contains
the license text and associated patent grants.
</p>
<!--=====================================================================-->
<h2 id="goals">Features and Goals</h2>
<!--=====================================================================-->
<ul>
<li>Correctness as defined by the
<a href="http://www.openmp.org/mp-documents/OpenMP3.1.pdf">OpenMP
3.1 standard (PDF)</a> now, and <a href="http://www.openmp.org/mp-documents/OpenMP4.0.0.pdf">OpenMP
4.0 standard (PDF)</a> in the future.</li>
<li>High performance.</li>
<li>ABI compatibility with <a href="http://gcc.gnu.org">Gcc</a> and
<a href="http://software.intel.com/en-us/intel-compilers">Intel's
existing OpenMP compilers.</a>
</li>
</ul>
<!--=====================================================================-->
<h2 id="why">Why have the runtime code here?</h2>
<!--=====================================================================-->
<p>It makes sense to have the runtime sources in the same place
(and with the same license) as the compiler.
</p>
<!--=====================================================================-->
<h2 id="requirements">Platform Support</h2>
<!--=====================================================================-->
<p>The OpenMP runtime is known to work on 32 and 64 bit X86
processors when compiled with either the Intel compiler or gcc, and also the Intel® Xeon Phi™ product family, when compiled with
the Intel compiler.
</p>
<p>A full OS compatibility matrix is in
<a href="README.txt">README.txt</a>
</p>
<!--=====================================================================-->
<h2 id="dir-structure">Status</h2>
<!--=====================================================================-->
<p>Currently the runtime is built with either gcc or icc. Obviously
it would also be good to build with Clang.
</p>
<!--=====================================================================-->
<h2>Get it and get involved!</h2>
<!--=====================================================================-->
<p>First please review our
<a href="http://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>.
<p>To check out the code, use:</p>
<ul>
<li><code>svn co http://llvm.org/svn/llvm-project/openmp/trunk openmp</code></li>
</ul>
<p>
Next:
</p>
<ul>
<li><code>cd openmp/runtime</code></li>
<li><code>make compiler=gcc</code></li>
</ul>
<p>Full details of how to build are in the
<a href="README.txt">README.txt</a>
</p>
<!--=====================================================================-->
<h3>Notes</h3>
<!--=====================================================================-->
<p>
</p>
<p>Send discussions to the
(<a href="http://lists.cs.uiuc.edu/mailman/listinfo/openmp-dev">OpenMP mailing list</a>).</p>
<!--=====================================================================-->
<h2>Design Documents</h2>
<!--=====================================================================-->
<ul>
<li><a href="Reference.pdf">Runtime design (PDF)</a></li>
</ul>
<!--=====================================================================-->
<h2>Copyright notices</h2>
<!--=====================================================================-->
<ul>
<li>
The OpenMP name and the OpenMP logo are registered trademarks of the
OpenMP Architecture Review Board.
</li>
<li>
Intel is a trademark of Intel Corporation in the U.S. and/or other
countries.
</li>
</ul>
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