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9 content="A glossary of terms used with the LLVM project.">
12 <div class="doc_title">The LLVM Lexicon</div>
13 <p class="doc_warning">NOTE: This document is a work in progress!</p>
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15 <div class="doc_section">Table Of Contents</div>
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17 <div class="doc_text">
19 <tr><th colspan="8"><b>- <a href="#A">A</a> -</b></th></tr>
21 <td><a href="#ADCE">ADCE</a></td>
23 <tr><th colspan="8"><b>- <a href="#B">B</a> -</b></th></tr>
25 <td><a href="#BURS">BURS</a></td>
27 <tr><th colspan="8"><b>- <a href="#C">C</a> -</b></th></tr>
29 <td><a href="#CSE">CSE</a></td>
31 <tr><th colspan="8"><b>- <a href="#D">D</a> -</b></th></tr>
33 <td><a href="#DSA">DSA</a></td>
34 <td><a href="#DSE">DSE</a></td>
36 <tr><th colspan="8"><b>- <a href="#I">I</a> -</b></th></tr>
38 <td><a href="#IPA">IPA</a></td>
39 <td><a href="#IPO">IPO</a></td>
41 <tr><th colspan="8"><b>- <a href="#L">L</a> -</b></th></tr>
43 <td><a href="#LICM">LICM</a></td>
44 <td><a href="#Load-VN">Load-VN</a></td>
46 <tr><th colspan="8"><b>- <a href="#P">P</a> -</b></th></tr>
48 <td><a href="#PRE">PRE</a></td>
50 <tr><th colspan="8"><b>- <a href="#R">R</a> -</b></th></tr>
52 <td><a href="#Reassociation">Reassociation</a></td>
54 <tr><th colspan="8"><b>- <a href="#S">S</a> -</b></th></tr>
56 <td><a href="#SCCP">SCCP</a></td>
57 <td><a href="#SSA">SSA</a></td>
62 <!-- *********************************************************************** -->
63 <div class="doc_section">Definitions</div>
64 <!-- *********************************************************************** -->
65 <!-- _______________________________________________________________________ -->
66 <div class="doc_subsection"><a name="A">- A -</a></div>
67 <div class="doc_text">
69 <dt><a name="ADCE"><b>ADCE</b></a></dt>
70 <dd>Aggressive Dead Code Elimination</dd>
73 <!-- _______________________________________________________________________ -->
74 <div class="doc_subsection"><a name="B">- B -</a></div>
75 <div class="doc_text">
77 <dt><a name="BURS"><b>BURS</b></a></dt>
78 <dd>Bottom Up Rewriting System - A method of instruction selection for
79 code generation. An example is the <a
80 href="http://www.program-transformation.org/Transform/BURG">BURG</a> tool.</dd>
83 <!-- _______________________________________________________________________ -->
84 <div class="doc_subsection"><a name="C">- C -</a></div>
85 <div class="doc_text">
87 <dt><a name="CSE"><b>CSE</b></a></dt>
88 <dd>Common Subexpression Elimination. An optimization that removes common
89 subexpression compuation. For example <tt>(a+b)*(a+b)</tt> has two
90 subexpressions that are the same: <tt>(a+b)</tt>. This optimization would
91 perform the addition only once and then perform the multiply (but only if
92 its compulationally correct/safe).
95 <!-- _______________________________________________________________________ -->
96 <div class="doc_subsection"><a name="D">- D -</a></div>
97 <div class="doc_text">
99 <dt><a name="DSA"><b>DSA</b></a></dt>
100 <dd>Data Structure Analysis</dd>
101 <dt><a name="DSE"><b>DSE</b></a></dt>
102 <dd>Dead Store Elimination</dd>
105 <!-- _______________________________________________________________________ -->
106 <div class="doc_subsection"><a name="I">- I -</a></div>
107 <div class="doc_text">
109 <dt><a name="IPA"><b>IPA</b></a></dt>
110 <dd>Inter-Procedural Analysis. Refers to any variety of code analysis that
111 occurs between procedures, functions or compilation units (modules).</dd>
112 <dt><a name="IPO"><b>IPO</b></a></dt>
113 <dd>Inter-Procedural Optimization. Refers to any variety of code
114 optimization that occurs between procedures, functions or compilation units
118 <!-- _______________________________________________________________________ -->
119 <div class="doc_subsection"><a name="L">- L -</a></div>
120 <div class="doc_text">
122 <dt><a name="LICM"><b>LICM</b></a></dt>
123 <dd>Loop Invariant Code Motion</dd>
124 <dt><a name="Load-VN"><b>Load-VN</b></a></dt>
125 <dd>Load Value Numbering</dd>
129 <!-- _______________________________________________________________________ -->
130 <div class="doc_subsection"><a name="P">- P -</a></div>
131 <div class="doc_text">
133 <dt><a name="PRE"><b>PRE</b></a></dt>
134 <dd>Partial Redundancy Elimination</dd>
138 <!-- _______________________________________________________________________ -->
139 <div class="doc_subsection"><a name="R">- R -</a></div>
140 <div class="doc_text">
142 <dt><a name="Reassociation"><b>Reassociation</b></a></dt> <dd>Rearranging
143 associative expressions to promote better redundancy elimination and other
144 optimization. For example, changing (A+B-A) into (B+A-A), permitting it to
145 be optimized into (B+0) then (B).
149 <!-- _______________________________________________________________________ -->
150 <div class="doc_subsection"><a name="S">- S -</a></div>
151 <div class="doc_text">
153 <dt><a name="SCCP"><b>SCCP</b></a></dt>
154 <dd>Sparse Conditional Constant Propagation
155 <dt><a name="SSA"><b>SSA</b></a></dt>
156 <dd>Static Single Assignment</dd>
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