final/www/index.html - polly - Git at Google

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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>

   <p>
   <div class="video-js-box" style="margin:auto; margin-top: 1em; margin-bottom: 1em">
     <video id="example_video_2" class="video-js" width="640" height="360"
            controls="controls" preload="auto"
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       <source
            src="http://www.grosser.es/publications/grosser-2011--Polly-First-successful-optimizations--LLVM-Developer-Meeting.mp4"
            type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
       <source
            src="http://www.grosser.es/publications/grosser-2011--Polly-First-successful-optimizations--LLVM-Developer-Meeting.webm"
            type='video/webm; codecs="vp8, vorbis"'>
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   </div>
   <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>December</p></td>
   <td>
   <p> New <a
 href="http://www.worldscientific.com/doi/abs/10.1142/S0129626412500107?af=R">
         publication</a> in the PPL Journal.
      </p>
   </td></tr>
   <tr><td width="120"><p>September</p></td>
   <td>
   <p>Experimental support for the <b>new isl code generator</b>
      was committed. The code generator can be parameterized on a fine-grained
      level. It gives direct control for example over unrolling, the amount of
      control overhead and the code size. It can also be used to
      create loops to handle border conditions or to perform full-partial tile
      separation.<br />
      We also relicensed isl under the <b>MIT license</b>. This means, with the
      exception of GMP (LGPL), there is no other (L)GPL licensed software used in
      Polly. The
      use of GMP is limited to a well defined interface. Replacing it with
      a BSD licensed replacement is a tractable engineering project we would
      be very interested in. For more information about isl see the <a
      href="http://www.kotnet.org/~skimo/isl/manual.pdf">isl manual</a>.
      </p>
   </td></tr>
   <tr><td width="120"><p>July</p></td>
   <td>
   <p> Polly can now be directly linked to the <a
 href="http://pluto-compiler.sourceforge.net/">Pluto optimizer</a>. We were
 already able to perform Pluto-like optimizations with Polly, as a similer
 algorithm was added to isl half a year ago. However, being able to directly
 compare with the original implementation will not only bring in competition in
 the optimizer field. It will also allow new experiments with a cutting edge
 research tool.<br \>
   This support was on of the outcomes of the 1-day Polly workshop and the
   following week of joint work at IISC Bangalore and in cooperation with
   AMD India.
   </td></tr>
   <td>
   </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>
   </ul>
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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>

	<p>
	<div class="video-js-box" style="margin:auto; margin-top: 1em; margin-bottom: 1em">
	<video id="example_video_2" class="video-js" width="640" height="360"
	controls="controls" preload="auto"
	poster="images/video-summit-2011.png">
	<source
	src="http://www.grosser.es/publications/grosser-2011--Polly-First-successful-optimizations--LLVM-Developer-Meeting.mp4"
	type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
	<source
	src="http://www.grosser.es/publications/grosser-2011--Polly-First-successful-optimizations--LLVM-Developer-Meeting.webm"
	type='video/webm; codecs="vp8, vorbis"'>
	<object id="flash_fallback_2" class="vjs-flash-fallback" width="640"
	height="360" type="application/x-shockwave-flash"
	data="http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf">
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	/>
	<img src="images/video-summit-2011.png" width="640" height="360" alt="Poster Image"
	title="No video playback capabilities." />
	</object>
	</video>
	</div>
	<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>December</p></td>
	<td>
	<p> New <a
	href="http://www.worldscientific.com/doi/abs/10.1142/S0129626412500107?af=R">
	publication</a> in the PPL Journal.
	</p>
	</td></tr>
	<tr><td width="120"><p>September</p></td>
	<td>
	<p>Experimental support for the <b>new isl code generator</b>
	was committed. The code generator can be parameterized on a fine-grained
	level. It gives direct control for example over unrolling, the amount of
	control overhead and the code size. It can also be used to
	create loops to handle border conditions or to perform full-partial tile
	separation.<br />
	We also relicensed isl under the <b>MIT license</b>. This means, with the
	exception of GMP (LGPL), there is no other (L)GPL licensed software used in
	Polly. The
	use of GMP is limited to a well defined interface. Replacing it with
	a BSD licensed replacement is a tractable engineering project we would
	be very interested in. For more information about isl see the <a
	href="http://www.kotnet.org/~skimo/isl/manual.pdf">isl manual</a>.
	</p>
	</td></tr>
	<tr><td width="120"><p>July</p></td>
	<td>
	<p> Polly can now be directly linked to the <a
	href="http://pluto-compiler.sourceforge.net/">Pluto optimizer</a>. We were
	already able to perform Pluto-like optimizations with Polly, as a similer
	algorithm was added to isl half a year ago. However, being able to directly
	compare with the original implementation will not only bring in competition in
	the optimizer field. It will also allow new experiments with a cutting edge
	research tool.<br \>
	This support was on of the outcomes of the 1-day Polly workshop and the
	following week of joint work at IISC Bangalore and in cooperation with
	AMD India.
	</td></tr>
	<td>
	</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>
	</ul>
	</div>
	</body>
	</html>