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<a href="./Home">MLton 20201002</a>
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<h1>SSASimplify</h1>
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<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>The optimization passes for the <a href="SSA">SSA</a> <a href="IntermediateLanguage">IntermediateLanguage</a> are
collected and controlled by the <span class="monospaced">Simplify</span> functor
(<a href="https://github.com/MLton/mlton/blob/master/mlton/ssa/simplify.sig"><span class="monospaced">simplify.sig</span></a>,
<a href="https://github.com/MLton/mlton/blob/master/mlton/ssa/simplify.fun"><span class="monospaced">simplify.fun</span></a>).</p></div>
<div class="paragraph"><p>The following optimization passes are implemented:</p></div>
<div class="ulist"><ul>
<li>
<p>
<a href="CombineConversions">CombineConversions</a>
</p>
</li>
<li>
<p>
<a href="CommonArg">CommonArg</a>
</p>
</li>
<li>
<p>
<a href="CommonBlock">CommonBlock</a>
</p>
</li>
<li>
<p>
<a href="CommonSubexp">CommonSubexp</a>
</p>
</li>
<li>
<p>
<a href="ConstantPropagation">ConstantPropagation</a>
</p>
</li>
<li>
<p>
<a href="Contify">Contify</a>
</p>
</li>
<li>
<p>
<a href="DuplicateGlobals">DuplicateGlobals</a>
</p>
</li>
<li>
<p>
<a href="Flatten">Flatten</a>
</p>
</li>
<li>
<p>
<a href="Inline">Inline</a>
</p>
</li>
<li>
<p>
<a href="IntroduceLoops">IntroduceLoops</a>
</p>
</li>
<li>
<p>
<a href="KnownCase">KnownCase</a>
</p>
</li>
<li>
<p>
<a href="LocalFlatten">LocalFlatten</a>
</p>
</li>
<li>
<p>
<a href="LocalRef">LocalRef</a>
</p>
</li>
<li>
<p>
<a href="LoopInvariant">LoopInvariant</a>
</p>
</li>
<li>
<p>
<a href="LoopUnfoll">LoopUnfoll</a>
</p>
</li>
<li>
<p>
<a href="LoopUnswitch">LoopUnswitch</a>
</p>
</li>
<li>
<p>
<a href="Redundant">Redundant</a>
</p>
</li>
<li>
<p>
<a href="RedundantTests">RedundantTests</a>
</p>
</li>
<li>
<p>
<a href="RemoveUnused">RemoveUnused</a>
</p>
</li>
<li>
<p>
<a href="ShareZeroVec">ShareZeroVec</a>
</p>
</li>
<li>
<p>
<a href="SimplifyTypes">SimplifyTypes</a>
</p>
</li>
<li>
<p>
<a href="SplitTypes">SplitTypes</a>
</p>
</li>
<li>
<p>
<a href="Useless">Useless</a>
</p>
</li>
</ul></div>
<div class="paragraph"><p>The following implementation passes are implemented:</p></div>
<div class="ulist"><ul>
<li>
<p>
<a href="PolyEqual">PolyEqual</a>
</p>
</li>
<li>
<p>
<a href="PolyHash">PolyHash</a>
</p>
</li>
</ul></div>
<div class="paragraph"><p>There are additional analysis and rewrite passes that augment many of the other optimization passes:</p></div>
<div class="ulist"><ul>
<li>
<p>
<a href="Multi">Multi</a>
</p>
</li>
<li>
<p>
<a href="Restore">Restore</a>
</p>
</li>
<li>
<p>
<a href="Shrink">Shrink</a>
</p>
</li>
</ul></div>
<div class="paragraph"><p>The optimization passes can be controlled from the command-line by the options:</p></div>
<div class="ulist"><ul>
<li>
<p>
<span class="monospaced">-diag-pass &lt;pass&gt;</span>&#8201;&#8212;&#8201;keep diagnostic info for pass
</p>
</li>
<li>
<p>
<span class="monospaced">-disable-pass &lt;pass&gt;</span>&#8201;&#8212;&#8201;skip optimization pass (if normally performed)
</p>
</li>
<li>
<p>
<span class="monospaced">-enable-pass &lt;pass&gt;</span>&#8201;&#8212;&#8201;perform optimization pass (if normally skipped)
</p>
</li>
<li>
<p>
<span class="monospaced">-keep-pass &lt;pass&gt;</span>&#8201;&#8212;&#8201;keep the results of pass
</p>
</li>
<li>
<p>
<span class="monospaced">-loop-passes &lt;n&gt;</span>&#8201;&#8212;&#8201;loop optimization passes
</p>
</li>
<li>
<p>
<span class="monospaced">-ssa-passes &lt;passes&gt;</span>&#8201;&#8212;&#8201;ssa optimization passes
</p>
</li>
</ul></div>
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