Import Upstream version 20180207
[hcoop/debian/mlton.git] / doc / guide / localhost / RemoveUnused
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22<a href="./Home">MLton 20180207</a>\r
23</div>\r
24</div>\r
25<div id="header">\r
26<h1>RemoveUnused</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><a href="RemoveUnused">RemoveUnused</a> is an optimization pass for both the <a href="SSA">SSA</a> and\r
32<a href="SSA2">SSA2</a> <a href="IntermediateLanguage">IntermediateLanguage</a>s, invoked from <a href="SSASimplify">SSASimplify</a> and\r
33<a href="SSA2Simplify">SSA2Simplify</a>.</p></div>\r
34</div>\r
35</div>\r
36<div class="sect1">\r
37<h2 id="_description">Description</h2>\r
38<div class="sectionbody">\r
39<div class="paragraph"><p>This pass aggressively removes unused:</p></div>\r
40<div class="ulist"><ul>\r
41<li>\r
42<p>\r
43datatypes\r
44</p>\r
45</li>\r
46<li>\r
47<p>\r
48datatype constructors\r
49</p>\r
50</li>\r
51<li>\r
52<p>\r
53datatype constructor arguments\r
54</p>\r
55</li>\r
56<li>\r
57<p>\r
58functions\r
59</p>\r
60</li>\r
61<li>\r
62<p>\r
63function arguments\r
64</p>\r
65</li>\r
66<li>\r
67<p>\r
68function returns\r
69</p>\r
70</li>\r
71<li>\r
72<p>\r
73blocks\r
74</p>\r
75</li>\r
76<li>\r
77<p>\r
78block arguments\r
79</p>\r
80</li>\r
81<li>\r
82<p>\r
83statements (variable bindings)\r
84</p>\r
85</li>\r
86<li>\r
87<p>\r
88handlers from non-tail calls (mayRaise analysis)\r
89</p>\r
90</li>\r
91<li>\r
92<p>\r
93continuations from non-tail calls (mayReturn analysis)\r
94</p>\r
95</li>\r
96</ul></div>\r
97</div>\r
98</div>\r
99<div class="sect1">\r
100<h2 id="_implementation">Implementation</h2>\r
101<div class="sectionbody">\r
102<div class="ulist"><ul>\r
103<li>\r
104<p>\r
105<a href="https://github.com/MLton/mlton/blob/master/mlton/ssa/remove-unused.fun"><span class="monospaced">remove-unused.fun</span></a>\r
106</p>\r
107</li>\r
108<li>\r
109<p>\r
110<a href="https://github.com/MLton/mlton/blob/master/mlton/ssa/remove-unused2.fun"><span class="monospaced">remove-unused2.fun</span></a>\r
111</p>\r
112</li>\r
113</ul></div>\r
114</div>\r
115</div>\r
116<div class="sect1">\r
117<h2 id="_details_and_notes">Details and Notes</h2>\r
118<div class="sectionbody">\r
119<div class="paragraph"><p></p></div>\r
120</div>\r
121</div>\r
122</div>\r
123<div id="footnotes"><hr></div>\r
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