Import Upstream version 20180207
[hcoop/debian/mlton.git] / doc / guide / localhost / Polyvariance
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22<a href="./Home">MLton 20180207</a>\r
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25<div id="header">\r
26<h1>Polyvariance</h1>\r
27</div>\r
28<div id="content">\r
29<div id="preamble">\r
30<div class="sectionbody">\r
31<div class="paragraph"><p>Polyvariance is an optimization pass for the <a href="SXML">SXML</a>\r
32<a href="IntermediateLanguage">IntermediateLanguage</a>, invoked from <a href="SXMLSimplify">SXMLSimplify</a>.</p></div>\r
33</div>\r
34</div>\r
35<div class="sect1">\r
36<h2 id="_description">Description</h2>\r
37<div class="sectionbody">\r
38<div class="paragraph"><p>This pass duplicates a higher-order, <span class="monospaced">let</span> bound function at each\r
39variable reference, if the cost is smaller than some threshold.</p></div>\r
40</div>\r
41</div>\r
42<div class="sect1">\r
43<h2 id="_implementation">Implementation</h2>\r
44<div class="sectionbody">\r
45<div class="ulist"><ul>\r
46<li>\r
47<p>\r
48<a href="https://github.com/MLton/mlton/blob/master/mlton/xml/polyvariance.fun"><span class="monospaced">polyvariance.fun</span></a>\r
49</p>\r
50</li>\r
51</ul></div>\r
52</div>\r
53</div>\r
54<div class="sect1">\r
55<h2 id="_details_and_notes">Details and Notes</h2>\r
56<div class="sectionbody">\r
57<div class="paragraph"><p></p></div>\r
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