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