2012-08-15 13:02:25 +08:00
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<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Polly - Load Polly into dragonegg</title>
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<div id="content">
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<!--=====================================================================-->
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<h1>Load Polly into dragonegg and automatically run it at -O3</h1>
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<!--=====================================================================-->
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<p><b>Note:</b>This is a quick note on how to load Polly into
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dragonegg. The choice of front-end does not affect the passes
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available with Polly, only the syntax is different.
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The <a href="example_load_Polly_into_clang.html">examples for use
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with clang</a> can also be performed with Polly, with suitable
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corrections in the syntax.
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<h2>Compile dragonegg with support for LLVM plugins</h2>
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The support for LLVM plugins in dragonegg is still experimental, and
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hence protected by a build option. You must rebuild dragonegg with the
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following options:
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<pre class="code">
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$ GCC=${PATH_TO_GCC} LLVM_CONFIG=${PATH_TO_LLVM_CONFIG} ENABLE_LLVM_PLUGINS=1 make
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</pre>
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<h2>Load Polly into dragonegg</h2>
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By loading Polly into dragonegg, the Polly options become automatically
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available. You can load Polly either by adding the relevant commands to
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the CPPFLAGS or by creating an alias.
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<pre class="code">
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2012-10-22 01:33:00 +08:00
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$ export CPPFLAGS="-fplugin=/path/to/dragonegg.so -fplugin-arg-dragonegg-llvm-option=-load:${POLLY_BUILD_DIR}/lib/LLVMPolly.so"
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2012-08-15 13:02:25 +08:00
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</pre>
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or
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<pre class="code">
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2012-10-22 01:33:00 +08:00
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$ alias pollycc gcc -fplugin=/path/to/dragonegg.so -fplugin-arg-dragonegg-llvm-option=-load:${POLLY_BUILD_DIR}/lib/LLVMPolly.so
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2012-08-15 13:02:25 +08:00
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</pre>
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<h2>Optimizing with Polly</h2>
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Optimizing with Polly is as easy as adding <b>-O3 -fplugin-arg-dragonegg-llvm-option=-polly</b> to your
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compiler flags (Polly is only available at -O3).
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<pre class="code">pollycc -O3 -fplugin-arg-dragonegg-llvm-option=-polly file.c</pre>
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<h2>Passing various options to Polly</h2>
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As must be evident from the examples so far, options to LLVM and its
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plugins are passed via the <b>-fplugin-arg-dragonegg-llvm-option</b>
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commandline argment.
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The <a href="example_load_Polly_into_clang.html">examples for use with
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clang</a> can be executed with dragonegg by replacing
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the <b>-mllvm</b> syntax with the dragonegg syntax.
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</div>
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</body>
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</html>
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