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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 05fe4b02561f4431626a73ac2900be523e233cd6 / . / 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">
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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>
Chris Lattner59f7f212005-11-29 01:34:50 +0000[diff] [blame]56 <td><a href="#SCC">SCC</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]57 <td><a href="#SCCP">SCCP</a></td>
Chris Lattnered51a0f2006-02-08 16:59:49 +0000[diff] [blame]58 <td><a href="#SRoA">SRoA</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]59 <td><a href="#SSA">SSA</a></td>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]60 </tr>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]61 </table>
62</div>
63
64<!-- *********************************************************************** -->
65<div class="doc_section">Definitions</div>
66<!-- *********************************************************************** -->
67<!-- _______________________________________________________________________ -->
68<div class="doc_subsection"><a name="A">- A -</a></div>
69<div class="doc_text">
70 <dl>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]71 <dt><a name="ADCE"><b>ADCE</b></a></dt>
72 <dd>Aggressive Dead Code Elimination</dd>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]73 </dl>
74</div>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]75<!-- _______________________________________________________________________ -->
Reid Spencerce6be332004-08-24 18:34:10 +0000[diff] [blame]76<div class="doc_subsection"><a name="B">- B -</a></div>
77<div class="doc_text">
78 <dl>
79 <dt><a name="BURS"><b>BURS</b></a></dt>
Chris Lattnerc4985ba2004-08-24 18:53:39 +0000[diff] [blame]80 <dd>Bottom Up Rewriting System - A method of instruction selection for
81 code generation. An example is the <a
82href="http://www.program-transformation.org/Transform/BURG">BURG</a> tool.</dd>
Reid Spencerce6be332004-08-24 18:34:10 +0000[diff] [blame]83 </dl>
84</div>
85<!-- _______________________________________________________________________ -->
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]86<div class="doc_subsection"><a name="C">- C -</a></div>
87<div class="doc_text">
88 <dl>
89 <dt><a name="CSE"><b>CSE</b></a></dt>
90 <dd>Common Subexpression Elimination. An optimization that removes common
91 subexpression compuation. For example <tt>(a+b)*(a+b)</tt> has two
92 subexpressions that are the same: <tt>(a+b)</tt>. This optimization would
93 perform the addition only once and then perform the multiply (but only if
94 its compulationally correct/safe).
95 </dl>
96</div>
97<!-- _______________________________________________________________________ -->
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]98<div class="doc_subsection"><a name="D">- D -</a></div>
99<div class="doc_text">
100 <dl>
Misha Brukman9a4c9042004-09-05 03:00:20 +0000[diff] [blame]101 <dt><a name="DSA"><b>DSA</b></a></dt>
Misha Brukman100bd712004-09-05 03:57:23 +0000[diff] [blame]102 <dd>Data Structure Analysis</dd>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]103 <dt><a name="DSE"><b>DSE</b></a></dt>
104 <dd>Dead Store Elimination</dd>
105 </dl>
106</div>
107<!-- _______________________________________________________________________ -->
Reid Spencera07e0b52004-10-30 21:40:28 +0000[diff] [blame]108<div class="doc_subsection"><a name="I">- I -</a></div>
109<div class="doc_text">
110 <dl>
111 <dt><a name="IPA"><b>IPA</b></a></dt>
112 <dd>Inter-Procedural Analysis. Refers to any variety of code analysis that
113 occurs between procedures, functions or compilation units (modules).</dd>
114 <dt><a name="IPO"><b>IPO</b></a></dt>
115 <dd>Inter-Procedural Optimization. Refers to any variety of code
116 optimization that occurs between procedures, functions or compilation units
117 (modules).</dd>
118 </dl>
119</div>
120<!-- _______________________________________________________________________ -->
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]121<div class="doc_subsection"><a name="L">- L -</a></div>
122<div class="doc_text">
123 <dl>
124 <dt><a name="LICM"><b>LICM</b></a></dt>
125 <dd>Loop Invariant Code Motion</dd>
Misha Brukman183cfc22004-08-24 04:13:17 +0000[diff] [blame]126 <dt><a name="Load-VN"><b>Load-VN</b></a></dt>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]127 <dd>Load Value Numbering</dd>
128 </dl>
129</div>
Chris Lattnerdbb85852005-05-13 20:18:49 +0000[diff] [blame]130
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]131<!-- _______________________________________________________________________ -->
132<div class="doc_subsection"><a name="P">- P -</a></div>
133<div class="doc_text">
134 <dl>
135 <dt><a name="PRE"><b>PRE</b></a></dt>
136 <dd>Partial Redundancy Elimination</dd>
137 </dl>
138</div>
Chris Lattnerdbb85852005-05-13 20:18:49 +0000[diff] [blame]139
140<!-- _______________________________________________________________________ -->
141<div class="doc_subsection"><a name="R">- R -</a></div>
142<div class="doc_text">
143 <dl>
144 <dt><a name="Reassociation"><b>Reassociation</b></a></dt> <dd>Rearranging
145 associative expressions to promote better redundancy elimination and other
146 optimization. For example, changing (A+B-A) into (B+A-A), permitting it to
147 be optimized into (B+0) then (B).
148 </dl>
149</div>
150
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]151<!-- _______________________________________________________________________ -->
152<div class="doc_subsection"><a name="S">- S -</a></div>
153<div class="doc_text">
154 <dl>
Chris Lattner59f7f212005-11-29 01:34:50 +0000[diff] [blame]155 <dt><a name="SCC"><b>SCC</b></a></dt>
156 <dd>Strongly Connected Component</dd>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]157 <dt><a name="SCCP"><b>SCCP</b></a></dt>
Chris Lattner59f7f212005-11-29 01:34:50 +0000[diff] [blame]158 <dd>Sparse Conditional Constant Propagation</dd>
Chris Lattnered51a0f2006-02-08 16:59:49 +0000[diff] [blame]159 <dt><a name="SRoA"><b>SRoA</b></a></dt>
160 <dd>Scalar Replacement of Aggregates</dd>
Misha Brukmanec8fe3c2004-08-24 01:57:02 +0000[diff] [blame]161 <dt><a name="SSA"><b>SSA</b></a></dt>
162 <dd>Static Single Assignment</dd>
163 </dl>
164</div>
Reid Spencer85baf762004-08-17 09:38:50 +0000[diff] [blame]165<!-- *********************************************************************** -->
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