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<h1>Flatten</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p><a href="Flatten">Flatten</a> is an optimization pass for the <a href="SSA">SSA</a>
<a href="IntermediateLanguage">IntermediateLanguage</a>, invoked from <a href="SSASimplify">SSASimplify</a>.</p></div>
</div>
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<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<div class="paragraph"><p>This pass flattens arguments to <a href="SSA">SSA</a> constructors, blocks, and
functions.</p></div>
<div class="paragraph"><p>If a tuple is explicitly available at all uses of a function
(resp. block), then:</p></div>
<div class="ulist"><ul>
<li>
<p>
The formals and call sites are changed so that the components of the
tuple are passed.
</p>
</li>
<li>
<p>
The tuple is reconstructed at the beginning of the body of the
function (resp. block).
</p>
</li>
</ul></div>
<div class="paragraph"><p>Similarly, if a tuple is explicitly available at all uses of a
constructor, then:</p></div>
<div class="ulist"><ul>
<li>
<p>
The constructor argument datatype is changed to flatten the tuple
type.
</p>
</li>
<li>
<p>
The tuple is passed flat at each <span class="monospaced">ConApp</span>.
</p>
</li>
<li>
<p>
The tuple is reconstructed at each <span class="monospaced">Case</span> transfer target.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_implementation">Implementation</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
<a href="https://github.com/MLton/mlton/blob/master/mlton/ssa/flatten.fun"><span class="monospaced">flatten.fun</span></a>
</p>
</li>
</ul></div>
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<div class="sect1">
<h2 id="_details_and_notes">Details and Notes</h2>
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<div class="paragraph"><p></p></div>
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