doc/guide/localhost/PolyHash

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  26 <h1>PolyHash</h1>
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  29 <div id="preamble">
  30 <div class="sectionbody">
  31 <div class="paragraph"><p><a href="PolyHash">PolyHash</a> is an optimization pass for the <a href="SSA">SSA</a>
  32 <a href="IntermediateLanguage">IntermediateLanguage</a>, invoked from <a href="SSASimplify">SSASimplify</a>.</p></div>
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  35 <div class="sect1">
  36 <h2 id="_description">Description</h2>
  37 <div class="sectionbody">
  38 <div class="paragraph"><p>This pass implements polymorphic, structural hashing.</p></div>
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  41 <div class="sect1">
  42 <h2 id="_implementation">Implementation</h2>
  43 <div class="sectionbody">
  44 <div class="ulist"><ul>
  45 <li>
  46 <p>
  47 <a href="https://github.com/MLton/mlton/blob/master/mlton/ssa/poly-hash.fun"><span class="monospaced">poly-hash.fun</span></a>
  48 </p>
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  53 <div class="sect1">
  54 <h2 id="_details_and_notes">Details and Notes</h2>
  55 <div class="sectionbody">
  56 <div class="paragraph"><p>For each datatype, tycon, and vector type, it builds and equality
  57 function and translates calls to <span class="monospaced">MLton_hash</span> into calls to that
  58 function.</p></div>
  59 <div class="paragraph"><p>For tuples, it does the equality test inline; i.e., it does not create
  60 a separate equality function for each tuple type.</p></div>
  61 <div class="paragraph"><p>All equality functions are created only if necessary, i.e., if
  62 equality is actually used at a type.</p></div>
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