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284 lines
9.4 KiB
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<title>Polly - Polyhedral optimizations for LLVM</title>
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<!--*********************************************************************-->
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<h1>Polly: Polyhedral optimizations for LLVM</h1>
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<!--*********************************************************************-->
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<p> Polly is a polyhedral optimizer for LLVM. Using an abstract mathematical
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representation it analyzes and optimizes the memory access pattern of a
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program. This includes data-locality optimizations for cache locality as
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well as automatic parallelization for thread-level and SIMD parallelism.
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Our overall goal is an integrated optimizer for data-locality and
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parallelism that takes advantage of multi-cores, cache hierarchies, short
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vector instructions as well as dedicated accelerators.</p>
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<p>
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<div class="video-js-box" style="margin:auto; margin-top: 1em; margin-bottom: 1em">
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<video id="example_video_2" class="video-js" width="640" height="360"
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controls="controls" preload="auto"
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poster="images/video-summit-2011.png">
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<source
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src="http://www.grosser.es/publications/grosser-2011--Polly-First-successful-optimizations--LLVM-Developer-Meeting.mp4"
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type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
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<b>WARNING:</b> Polly started as a research project and larger parts of it are
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still open research projects. Even though we aim for a robust, production
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quality implementation, not all parts of Polly are there yet. We invite
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you to contribute - both as industry collaborator, who may want to use parts
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of Polly in production, as well as researcher, who is more interested in using
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his expertise to work on some of the open research projects.
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</p>
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<!--=====================================================================-->
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<h2>News</h2>
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<!--=====================================================================-->
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<table id="news">
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<tr><td><b>2012</b></td></tr>
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<tr><td width="120"><p>December</p></td>
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<td>
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<p> New <a
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href="http://www.worldscientific.com/doi/abs/10.1142/S0129626412500107?af=R">
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publication</a> in the PPL Journal.
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</p>
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</td></tr>
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<tr><td width="120"><p>September</p></td>
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<td>
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<p>Experimental support for the <b>new isl code generator</b>
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was committed. The code generator can be parameterized on a fine-grained
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level. It gives direct control for example over unrolling, the amount of
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control overhead and the code size. It can also be used to
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create loops to handle border conditions or to perform full-partial tile
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separation.<br />
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We also relicensed isl under the <b>MIT license</b>. This means, with the
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exception of GMP (LGPL), there is no other (L)GPL licensed software used in
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Polly. The
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use of GMP is limited to a well defined interface. Replacing it with
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a BSD licensed replacement is a tractable engineering project we would
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be very interested in. For more information about isl see the <a
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href="http://www.kotnet.org/~skimo/isl/manual.pdf">isl manual</a>.
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</p>
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</td></tr>
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<tr><td width="120"><p>July</p></td>
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<td>
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<p> Polly can now be directly linked to the <a
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href="http://pluto-compiler.sourceforge.net/">Pluto optimizer</a>. We were
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already able to perform Pluto-like optimizations with Polly, as a similer
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algorithm was added to isl half a year ago. However, being able to directly
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compare with the original implementation will not only bring in competition in
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the optimizer field. It will also allow new experiments with a cutting edge
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research tool.<br \>
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This support was on of the outcomes of the 1-day Polly workshop and the
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following week of joint work at IISC Bangalore and in cooperation with
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AMD India.
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</td></tr>
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<td>
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</td></tr>
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<tr><td width="120"><p>February</p></td>
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<td>
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<p>Polly is an official LLVM project, reachable at <a
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href="http://polly.llvm.org">http://polly.llvm.org</a></p>
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</td></tr>
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<tr><td width="120"><p>January</p></td>
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<td>
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<p>Improved support for the isl scheduling optimizer</p>
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Polly can now automatically optimize all <a
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href="http://www.cse.ohio-state.edu/~pouchet/software/polybench/">polybench
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2.0</a> kernels without the help of
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an external optimizer. The compile time is reasonable and we can show
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notable speedups for various kernels.
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</td></tr>
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<tr>
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<tr><td><b><br/>2011</b></td></tr>
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<tr><td width="120"><p>November</p></td>
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<td>
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<p>
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Talk at the <a href="http://llvm.org/devmtg/2011-11/">
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LLVM Developer Meeting 2011</a></p>
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New SCEV parser<br>
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(Allows parameters in array subscript and max/signextend)
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</td></tr>
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<tr>
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<td><p>October</p></td>
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<td>
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<p>Polly can use the isl schedule optimizer<br>
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(The optimizer is similar to the one in Pluto, but it is part of isl)
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</p>
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</td></tr>
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<tr>
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<td><p>August</p></td>
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<td>
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<p>
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<a href="example_load_Polly_into_clang.html">Use Polly as
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clang plugin</a></p>
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</td>
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</tr>
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<tr>
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<td><p>July</p></td>
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<td>
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<p> Polly builder as part of the <a
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href="http://lab.llvm.org:8011/console">LLVM Buildbots</a>
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</p>
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</td>
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</tr>
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<tr>
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<td><p>June</p></td>
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<td>
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<p><a href="http://www.grosser.es">Tobias</a> is founded for
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three years by a <a
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href="http://research.google.com/university/relations/fellowship_recipients.html">
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Google Europe Fellowship in Efficient Computing</a>.
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</p>
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</td>
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</tr>
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<tr>
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<td><p>May </p></td>
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<td><p><a href="http://www.grosser.es">Tobias</a>' diploma thesis and
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Raghesh's master thesis. See our <a
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href="publications.html">list of publications</a>.</p></td>
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</tr>
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<tr>
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<td><p>April</p></td>
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<td><p>Polly moves to the LLVM infrastructure (svn, bugtracker)</p></td>
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</tr>
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<tr>
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<td><p>March</p></td>
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<td><p>Presentation at <a
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href="http://impact2011.inrialpes.fr/">CGO/IMPACT</a></p>
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<p>Polly can compile
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polybench 2.0 with vectorization and OpenMP code generation</p>
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</td>
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</tr>
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<tr>
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<td><p>Februar</p></td>
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<td><p>pollycc - a script to automatically compile with
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polyhedral optimizations </p></td>
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</tr>
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<tr>
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<td><p> Januar</p></td>
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<td><p> Basic OpenMP support, Alias analysis integration,
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Pluto/POCC support </p></td>
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</tr>
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<tr><td><b><br>2010</b></td></tr>
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<tr>
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<td><p> Dezember </p></td>
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<td><p>Basic vectorization support </p></td>
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</tr>
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<tr>
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<td><p> November </p></td>
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<td><p>Talk at the <a
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href="http://llvm.org/devmtg/2010-11/">LLVM Developer Meeting</a> </p></td>
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</tr>
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<tr>
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<td><p>October</p></td>
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<td><p>Dependency analysis </p>
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<p>Finished Phase 1 - Get something working </p>
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<p>Support scalar dependences and sequential SCoPs </p>
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</td>
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</tr>
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<tr>
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<td><p>August</p></td>
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<td><p>RegionInfo pass committed to LLVM</p>
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<p>llvm-test suite compiles </p>
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</td>
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</tr>
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<tr>
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<td><p>July</p></td>
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<td><p>Code generation works for normal SCoPs. </p></td>
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</tr>
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<tr>
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<td><p>June </p></td>
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<td><p>OpenSCoP import/export works (as far as openscop is finished).</p></td>
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</tr>
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<tr>
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<td><p>May</p></td>
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<td><p>The CLooG AST can be parsed.</p>
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</td>
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</tr>
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<tr>
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<td><p>April</p></td>
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<td><p>SCoPs can automatically be detected. </p></td>
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</tr>
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<tr>
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<td><p>March</p></td>
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<td><p>The RegionInfo framework is almost completed. </p></td>
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</tr>
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<tr>
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<td><p>February</p></td>
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<td><p>Translate a simple loop to Polly-IR and regenerate a loop structure
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with CLooG works. </p>
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<p>ISL and CLooG are integrated. </p></td>
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</tr>
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</tr>
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<tr>
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<td><p>January</p></td>
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<td><p>The RegionInfo pass is finished. </p></td>
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</tr>
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<tr><td><b><br>2009</b></td></tr>
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<tr>
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<td><p>End of the year</p></td>
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<td><p>Work on the infrastructure started. </p></td>
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</tr>
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</table>
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</ul>
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