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2<html>
3<head>
4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
5 <title>The LLVM Lexicon</title>
6 <link rel="stylesheet" href="llvm.css" type="text/css">
7 <meta name="author" content="Various">
8 <meta name="description"
9 content="A glossary of terms used with the LLVM project.">
10</head>
11<body>
12<div class="doc_title">The LLVM Lexicon</div>
13<p class="doc_warning">NOTE: This document is a work in progress!</p>
14<!-- *********************************************************************** -->
15<div class="doc_section">Table Of Contents</div>
16<!-- *********************************************************************** -->
17<div class="doc_text">
18 <table>
19 <tr><th colspan="8"><b>- <a href="#A">A</a> -</b></th></tr>
20 <tr>
21 <td><a href="#ADCE">ADCE</a></td>
22 </tr>
23 <tr><th colspan="8"><b>- <a href="#B">B</a> -</b></th></tr>
24 <tr>
25 <td><a href="#BURS">BURS</a></td>
26 </tr>
27 <tr><th colspan="8"><b>- <a href="#C">C</a> -</b></th></tr>
28 <tr>
29 <td><a href="#CSE">CSE</a></td>
30 </tr>
31 <tr><th colspan="8"><b>- <a href="#D">D</a> -</b></th></tr>
32 <tr>
33 <td><a href="#DSA">DSA</a></td>
34 <td><a href="#DSE">DSE</a></td>
35 </tr>
36 <tr><th colspan="8"><b>- <a href="#I">I</a> -</b></th></tr>
37 <tr>
38 <td><a href="#IPA">IPA</a></td>
39 <td><a href="#IPO">IPO</a></td>
40 </tr>
41 <tr><th colspan="8"><b>- <a href="#L">L</a> -</b></th></tr>
42 <tr>
43 <td><a href="#LCSSA">LCSSA</a></td>
44 <td><a href="#LICM">LICM</a></td>
45 <td><a href="#Load-VN">Load-VN</a></td>
46 </tr>
47 <tr><th colspan="8"><b>- <a href="#P">P</a> -</b></th></tr>
48 <tr>
49 <td><a href="#PRE">PRE</a></td>
50 </tr>
51 <tr><th colspan="8"><b>- <a href="#R">R</a> -</b></th></tr>
52 <tr>
53 <td><a href="#Reassociation">Reassociation</a></td>
54 </tr>
55 <tr><th colspan="8"><b>- <a href="#S">S</a> -</b></th></tr>
56 <tr>
57 <td><a href="#SCC">SCC</a></td>
58 <td><a href="#SCCP">SCCP</a></td>
59 <td><a href="#SRoA">SRoA</a></td>
60 <td><a href="#SSA">SSA</a></td>
61 </tr>
62 </table>
63</div>
64
65<!-- *********************************************************************** -->
66<div class="doc_section">Definitions</div>
67<!-- *********************************************************************** -->
68<!-- _______________________________________________________________________ -->
69<div class="doc_subsection"><a name="A">- A -</a></div>
70<div class="doc_text">
71 <dl>
72 <dt><a name="ADCE"><b>ADCE</b></a></dt>
73 <dd>Aggressive Dead Code Elimination</dd>
74 </dl>
75</div>
76<!-- _______________________________________________________________________ -->
77<div class="doc_subsection"><a name="B">- B -</a></div>
78<div class="doc_text">
79 <dl>
80 <dt><a name="BURS"><b>BURS</b></a></dt>
81 <dd>Bottom Up Rewriting System - A method of instruction selection for
82 code generation. An example is the <a
83href="http://www.program-transformation.org/Transform/BURG">BURG</a> tool.</dd>
84 </dl>
85</div>
86<!-- _______________________________________________________________________ -->
87<div class="doc_subsection"><a name="C">- C -</a></div>
88<div class="doc_text">
89 <dl>
90 <dt><a name="CSE"><b>CSE</b></a></dt>
91 <dd>Common Subexpression Elimination. An optimization that removes common
92 subexpression compuation. For example <tt>(a+b)*(a+b)</tt> has two
93 subexpressions that are the same: <tt>(a+b)</tt>. This optimization would
94 perform the addition only once and then perform the multiply (but only if
95 its compulationally correct/safe).
96 </dl>
97</div>
98<!-- _______________________________________________________________________ -->
99<div class="doc_subsection"><a name="D">- D -</a></div>
100<div class="doc_text">
101 <dl>
102 <dt><a name="DSA"><b>DSA</b></a></dt>
103 <dd>Data Structure Analysis</dd>
104 <dt><a name="DSE"><b>DSE</b></a></dt>
105 <dd>Dead Store Elimination</dd>
106 </dl>
107</div>
108<!-- _______________________________________________________________________ -->
109<div class="doc_subsection"><a name="I">- I -</a></div>
110<div class="doc_text">
111 <dl>
112 <dt><a name="IPA"><b>IPA</b></a></dt>
113 <dd>Inter-Procedural Analysis. Refers to any variety of code analysis that
114 occurs between procedures, functions or compilation units (modules).</dd>
115 <dt><a name="IPO"><b>IPO</b></a></dt>
116 <dd>Inter-Procedural Optimization. Refers to any variety of code
117 optimization that occurs between procedures, functions or compilation units
118 (modules).</dd>
119 </dl>
120</div>
121<!-- _______________________________________________________________________ -->
122<div class="doc_subsection"><a name="L">- L -</a></div>
123<div class="doc_text">
124 <dl>
125 <dt><a name="LCSSA"><b>LCSSA</b></a></dt>
126 <dd>Loop-Closed Static Single Assignment Form</dd>
127 <dt><a name="LICM"><b>LICM</b></a></dt>
128 <dd>Loop Invariant Code Motion</dd>
129 <dt><a name="Load-VN"><b>Load-VN</b></a></dt>
130 <dd>Load Value Numbering</dd>
131 </dl>
132</div>
133
134<!-- _______________________________________________________________________ -->
135<div class="doc_subsection"><a name="P">- P -</a></div>
136<div class="doc_text">
137 <dl>
138 <dt><a name="PRE"><b>PRE</b></a></dt>
139 <dd>Partial Redundancy Elimination</dd>
140 </dl>
141</div>
142
143<!-- _______________________________________________________________________ -->
144<div class="doc_subsection"><a name="R">- R -</a></div>
145<div class="doc_text">
146 <dl>
147 <dt><a name="Reassociation"><b>Reassociation</b></a></dt> <dd>Rearranging
148 associative expressions to promote better redundancy elimination and other
149 optimization. For example, changing (A+B-A) into (B+A-A), permitting it to
150 be optimized into (B+0) then (B).
151 </dl>
152</div>
153
154<!-- _______________________________________________________________________ -->
155<div class="doc_subsection"><a name="S">- S -</a></div>
156<div class="doc_text">
157 <dl>
158 <dt><a name="SCC"><b>SCC</b></a></dt>
159 <dd>Strongly Connected Component</dd>
160 <dt><a name="SCCP"><b>SCCP</b></a></dt>
161 <dd>Sparse Conditional Constant Propagation</dd>
162 <dt><a name="SRoA"><b>SRoA</b></a></dt>
163 <dd>Scalar Replacement of Aggregates</dd>
164 <dt><a name="SSA"><b>SSA</b></a></dt>
165 <dd>Static Single Assignment</dd>
166 </dl>
167</div>
168<!-- *********************************************************************** -->
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