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<title>Polly - Polyhedral optimizations for LLVM</title>
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<h1>Polly: Polyhedral optimizations for LLVM</h1>
<!--*********************************************************************-->
<p> Polly is a polyhedral optimizer for LLVM. Using an abstract mathematical
representation it analyzes and optimizes the memory access pattern of a
program. This includes data-locality optimizations for cache locality as
well as automatic parallelization for thread-level and SIMD parallelism.
Our overall goal is an integrated optimizer for data-locality and
parallelism that takes advantage of multi-cores, cache hierarchies, short
vector instructions as well as dedicated accelerators.</p>
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<b>WARNING:</b> Polly started as a research project and larger parts of it are
still open research projects. Even though we aim for a robust, production
quality implementation, not all parts of Polly are there yet. We invite
you to contribute - both as industry collaborator, who may want to use parts
of Polly in production, as well as researcher, who is more interested in using
his expertise to work on some of the open research projects.
</p>
<!--=====================================================================-->
<h2>News</h2>
<!--=====================================================================-->
<table id="news">
<tr><td><b>2012</b></td></tr>
<tr><td width="120"><p>February</p></td>
<td>
<p>Polly is an official LLVM project, reachable at <a
href="http://polly.llvm.org">http://polly.llvm.org</a></p>
</td></tr>
<tr><td width="120"><p>January</p></td>
<td>
<p>Improved support for the isl scheduling optimizer</p>
Polly can now automatically optimize all <a
href="http://www.cse.ohio-state.edu/~pouchet/software/polybench/">polybench
2.0</a> kernels without the help of
an external optimizer. The compile time is reasonable and we can show
notable speedups for various kernels.
</td></tr>
<tr>
<tr><td><b><br/>2011</b></td></tr>
<tr><td width="120"><p>November</p></td>
<td>
<p>
Talk at the <a href="http://llvm.org/devmtg/2011-11/">
LLVM Developer Meeting 2011</a></p>
New SCEV parser<br>
(Allows parameters in array subscript and max/signextend)
</td></tr>
<tr>
<td><p>October</p></td>
<td>
<p>Polly can use the isl schedule optimizer<br>
(The optimizer is similar to the one in Pluto, but it is part of isl)
</p>
</td></tr>
<tr>
<td><p>August</p></td>
<td>
<p>
<a href="example_load_Polly_into_clang.html">Use Polly as
clang plugin</a></p>
</td>
</tr>
<tr>
<td><p>July</p></td>
<td>
<p> Polly builder as part of the <a
href="http://lab.llvm.org:8011/console">LLVM Buildbots</a>
</p>
</td>
</tr>
<tr>
<td><p>June</p></td>
<td>
<p><a href="http://www.grosser.es">Tobias</a> is founded for
three years by a <a
href="http://research.google.com/university/relations/fellowship_recipients.html">
Google Europe Fellowship in Efficient Computing</a>.
</p>
</td>
</tr>
<tr>
<td><p>May </p></td>
<td><p><a href="http://www.grosser.es">Tobias</a>' diploma thesis and
Raghesh's master thesis. See our <a
href="publications.html">list of publications</a>.</p></td>
</tr>
<tr>
<td><p>April</p></td>
<td><p>Polly moves to the LLVM infrastructure (svn, bugtracker)</p></td>
</tr>
<tr>
<td><p>March</p></td>
<td><p>Presentation at <a
href="http://impact2011.inrialpes.fr/">CGO/IMPACT</a></p>
<p>Polly can compile
polybench 2.0 with vectorization and OpenMP code generation</p>
</td>
</tr>
<tr>
<td><p>Februar</p></td>
<td><p>pollycc - a script to automatically compile with
polyhedral optimizations </p></td>
</tr>
<tr>
<td><p> Januar</p></td>
<td><p> Basic OpenMP support, Alias analysis integration,
Pluto/POCC support </p></td>
</tr>
<tr><td><b><br>2010</b></td></tr>
<tr>
<td><p> Dezember </p></td>
<td><p>Basic vectorization support </p></td>
</tr>
<tr>
<td><p> November </p></td>
<td><p>Talk at the <a
href="http://llvm.org/devmtg/2010-11/">LLVM Developer Meeting</a> </p></td>
</tr>
<tr>
<td><p>October</p></td>
<td><p>Dependency analysis </p>
<p>Finished Phase 1 - Get something working </p>
<p>Support scalar dependences and sequential SCoPs </p>
</td>
</tr>
<tr>
<td><p>August</p></td>
<td><p>RegionInfo pass committed to LLVM</p>
<p>llvm-test suite compiles </p>
</td>
</tr>
<tr>
<td><p>July</p></td>
<td><p>Code generation works for normal SCoPs. </p></td>
</tr>
<tr>
<td><p>June </p></td>
<td><p>OpenSCoP import/export works (as far as openscop is finished).</p></td>
</tr>
<tr>
<td><p>May</p></td>
<td><p>The CLooG AST can be parsed.</p>
</td>
</tr>
<tr>
<td><p>April</p></td>
<td><p>SCoPs can automatically be detected. </p></td>
</tr>
<tr>
<td><p>March</p></td>
<td><p>The RegionInfo framework is almost completed. </p></td>
</tr>
<tr>
<td><p>February</p></td>
<td><p>Translate a simple loop to Polly-IR and regenerate a loop structure
with CLooG works. </p>
<p>ISL and CLooG are integrated. </p></td>
</tr>
</tr>
<tr>
<td><p>January</p></td>
<td><p>The RegionInfo pass is finished. </p></td>
</tr>
<tr><td><b><br>2009</b></td></tr>
<tr>
<td><p>End of the year</p></td>
<td><p>Work on the infrastructure started. </p></td>
</tr>
</table>
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