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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / dbb85859f9bd0550d794d4c7af94f1e13ffdaa5d / . / docs / Lexicon.html
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Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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">
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]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>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]19 <tr><th colspan="8"><b>- <a href="#A">A</a> -</b></th></tr>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]20 <tr>
21 <td><a href="#ADCE">ADCE</a></td>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]22 </tr>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]23 <tr><th colspan="8"><b>- <a href="#B">B</a> -</b></th></tr>
Reid Spencerce6be332004-08-24 18:34:10 +0000[diff] [blame]24 <tr>
25 <td><a href="#BURS">BURS</a></td>
Reid Spencerce6be332004-08-24 18:34:10 +0000[diff] [blame]26 </tr>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]27 <tr><th colspan="8"><b>- <a href="#C">C</a> -</b></th></tr>
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]28 <tr>
29 <td><a href="#CSE">CSE</a></td>
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]30 </tr>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]31 <tr><th colspan="8"><b>- <a href="#D">D</a> -</b></th></tr>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]32 <tr>
Misha Brukman9a4c9042004-09-05 03:00:20 +0000[diff] [blame]33 <td><a href="#DSA">DSA</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]34 <td><a href="#DSE">DSE</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]35 </tr>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]36 <tr><th colspan="8"><b>- <a href="#I">I</a> -</b></th></tr>
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]37 <tr>
38 <td><a href="#IPA">IPA</a></td>
39 <td><a href="#IPO">IPO</a></td>
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]40 </tr>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]41 <tr><th colspan="8"><b>- <a href="#L">L</a> -</b></th></tr>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]42 <tr>
43 <td><a href="#LICM">LICM</a></td>
Misha Brukman183cfc22004-08-24 04:13:17 +0000[diff] [blame]44 <td><a href="#Load-VN">Load-VN</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]45 </tr>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]46 <tr><th colspan="8"><b>- <a href="#P">P</a> -</b></th></tr>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]47 <tr>
48 <td><a href="#PRE">PRE</a></td>
Chris Lattnerdbb85852005-05-13 20:18:49 +0000[diff] [blame^]49 </tr>
50 <tr><th colspan="8"><b>- <a href="#R">R</a> -</b></th></tr>
51 <tr>
52 <td><a href="#Reassociation">Reassociation</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]53 </tr>
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]54 <tr><th colspan="8"><b>- <a href="#S">S</a> -</b></th></tr>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]55 <tr>
56 <td><a href="#SCCP">SCCP</a></td>
57 <td><a href="#SSA">SSA</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]58 </tr>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]59 </table>
60</div>
61
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">
68 <dl>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]69 <dt><a name="ADCE"><b>ADCE</b></a></dt>
70 <dd>Aggressive Dead Code Elimination</dd>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]71 </dl>
72</div>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]73<!-- _______________________________________________________________________ -->
Reid Spencerce6be332004-08-24 18:34:10 +0000[diff] [blame]74<div class="doc_subsection"><a name="B">- B -</a></div>
75<div class="doc_text">
76 <dl>
77 <dt><a name="BURS"><b>BURS</b></a></dt>
Chris Lattnerc4985ba2004-08-24 18:53:39 +0000[diff] [blame]78 <dd>Bottom Up Rewriting System - A method of instruction selection for
79 code generation. An example is the <a
80href="http://www.program-transformation.org/Transform/BURG">BURG</a> tool.</dd>
Reid Spencerce6be332004-08-24 18:34:10 +0000[diff] [blame]81 </dl>
82</div>
83<!-- _______________________________________________________________________ -->
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]84<div class="doc_subsection"><a name="C">- C -</a></div>
85<div class="doc_text">
86 <dl>
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).
93 </dl>
94</div>
95<!-- _______________________________________________________________________ -->
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]96<div class="doc_subsection"><a name="D">- D -</a></div>
97<div class="doc_text">
98 <dl>
Misha Brukman9a4c9042004-09-05 03:00:20 +0000[diff] [blame]99 <dt><a name="DSA"><b>DSA</b></a></dt>
Misha Brukman100bd712004-09-05 03:57:23 +0000[diff] [blame]100 <dd>Data Structure Analysis</dd>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]101 <dt><a name="DSE"><b>DSE</b></a></dt>
102 <dd>Dead Store Elimination</dd>
103 </dl>
104</div>
105<!-- _______________________________________________________________________ -->
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]106<div class="doc_subsection"><a name="I">- I -</a></div>
107<div class="doc_text">
108 <dl>
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
115 (modules).</dd>
116 </dl>
117</div>
118<!-- _______________________________________________________________________ -->
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]119<div class="doc_subsection"><a name="L">- L -</a></div>
120<div class="doc_text">
121 <dl>
122 <dt><a name="LICM"><b>LICM</b></a></dt>
123 <dd>Loop Invariant Code Motion</dd>
Misha Brukman183cfc22004-08-24 04:13:17 +0000[diff] [blame]124 <dt><a name="Load-VN"><b>Load-VN</b></a></dt>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]125 <dd>Load Value Numbering</dd>
126 </dl>
127</div>
Chris Lattnerdbb85852005-05-13 20:18:49 +0000[diff] [blame^]128
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]129<!-- _______________________________________________________________________ -->
130<div class="doc_subsection"><a name="P">- P -</a></div>
131<div class="doc_text">
132 <dl>
133 <dt><a name="PRE"><b>PRE</b></a></dt>
134 <dd>Partial Redundancy Elimination</dd>
135 </dl>
136</div>
Chris Lattnerdbb85852005-05-13 20:18:49 +0000[diff] [blame^]137
138<!-- _______________________________________________________________________ -->
139<div class="doc_subsection"><a name="R">- R -</a></div>
140<div class="doc_text">
141 <dl>
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).
146 </dl>
147</div>
148
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]149<!-- _______________________________________________________________________ -->
150<div class="doc_subsection"><a name="S">- S -</a></div>
151<div class="doc_text">
152 <dl>
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>
157 </dl>
158</div>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]159<!-- *********************************************************************** -->
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