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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 Spencer9f093ed2004-08-17 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>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]12<h1>The LLVM Lexicon</h1>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]13<p class="doc_warning">NOTE: This document is a work in progress!</p>
14<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]15<h2>Table Of Contents</h2>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]16<!-- *********************************************************************** -->
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]17<div>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]18 <table>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]19 <tr><th colspan="8"><b>- <a href="#A">A</a> -</b></th></tr>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]20 <tr>
21 <td><a href="#ADCE">ADCE</a></td>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]22 </tr>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]23 <tr><th colspan="8"><b>- <a href="#B">B</a> -</b></th></tr>
Reid Spencer7c8d6582004-08-24 18:34:10 +0000[diff] [blame]24 <tr>
25 <td><a href="#BURS">BURS</a></td>
Reid Spencer7c8d6582004-08-24 18:34:10 +0000[diff] [blame]26 </tr>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]27 <tr><th colspan="8"><b>- <a href="#C">C</a> -</b></th></tr>
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]28 <tr>
29 <td><a href="#CSE">CSE</a></td>
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]30 </tr>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]31 <tr><th colspan="8"><b>- <a href="#D">D</a> -</b></th></tr>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]32 <tr>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]33 <td><a href="#DAG">DAG</a></td>
34 <td><a href="#Derived_Pointer">Derived Pointer</a></td>
Misha Brukmanadfa8b82004-09-05 03:00:20 +0000[diff] [blame]35 <td><a href="#DSA">DSA</a></td>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]36 <td><a href="#DSE">DSE</a></td>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]37 </tr>
Bill Wendlingd9f23c42011-09-27 18:44:01 +0000[diff] [blame]38 <tr><th colspan="8"><b>- <a href="#F">F</a> -</b></th></tr>
39 <tr>
40 <td><a href="#FCA">FCA</a></td>
41 </tr>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]42 <tr><th colspan="8"><b>- <a href="#G">G</a> -</b></th></tr>
Dan Gohman8ef44982008-11-24 17:18:39 +0000[diff] [blame]43 <tr>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]44 <td><a href="#GC">GC</a></td>
45 </tr>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]46 <tr><th colspan="8"><b>- <a href="#I">I</a> -</b></th></tr>
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]47 <tr>
48 <td><a href="#IPA">IPA</a></td>
49 <td><a href="#IPO">IPO</a></td>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]50 <td><a href="#ISel">ISel</a></td>
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]51 </tr>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]52 <tr><th colspan="8"><b>- <a href="#L">L</a> -</b></th></tr>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]53 <tr>
Owen Anderson7a312482006-10-18 05:50:12 +0000[diff] [blame]54 <td><a href="#LCSSA">LCSSA</a></td>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]55 <td><a href="#LICM">LICM</a></td>
Misha Brukman2ace8cb2004-08-24 04:13:17 +0000[diff] [blame]56 <td><a href="#Load-VN">Load-VN</a></td>
Nick Lewyckya3c9f212010-04-05 05:48:47 +0000[diff] [blame]57 <td><a href="#LTO">LTO</a></td>
58 </tr>
59 <tr><th colspan="8"><b>- <a href="#M">M</a> -</b></th></tr>
60 <tr>
61 <td><a href="#MC">MC</a></td>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]62 </tr>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]63 <tr><th colspan="8"><b>- <a href="#O">O</a> -</b></th></tr>
64 <tr>
65 <td><a href="#Object_Pointer">Object Pointer</a></td>
66 </tr>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]67 <tr><th colspan="8"><b>- <a href="#P">P</a> -</b></th></tr>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]68 <tr>
69 <td><a href="#PRE">PRE</a></td>
Chris Lattner153827b2005-05-13 20:18:49 +0000[diff] [blame]70 </tr>
71 <tr><th colspan="8"><b>- <a href="#R">R</a> -</b></th></tr>
72 <tr>
Dan Gohman67feab32008-11-07 20:29:17 +0000[diff] [blame]73 <td><a href="#RAUW">RAUW</a></td>
Chris Lattner153827b2005-05-13 20:18:49 +0000[diff] [blame]74 <td><a href="#Reassociation">Reassociation</a></td>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]75 <td><a href="#Root">Root</a></td>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]76 </tr>
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]77 <tr><th colspan="8"><b>- <a href="#S">S</a> -</b></th></tr>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]78 <tr>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]79 <td><a href="#Safe_Point">Safe Point</a></td>
Chris Lattnera3198312005-11-29 01:34:50 +0000[diff] [blame]80 <td><a href="#SCC">SCC</a></td>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]81 <td><a href="#SCCP">SCCP</a></td>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]82 <td><a href="#SDISel">SDISel</a></td>
Chris Lattner4999a5c2006-02-08 16:59:49 +0000[diff] [blame]83 <td><a href="#SRoA">SRoA</a></td>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]84 <td><a href="#Stack_Map">Stack Map</a></td>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]85 </tr>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]86 </table>
87</div>
88
89<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]90<h2>Definitions</h2>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]91<!-- *********************************************************************** -->
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]92<div>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]93<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]94<h3><a name="A">- A -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]95<div>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]96 <dl>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]97 <dt><a name="ADCE"><b>ADCE</b></a></dt>
98 <dd>Aggressive Dead Code Elimination</dd>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]99 </dl>
100</div>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]101<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]102<h3><a name="B">- B -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]103<div>
Reid Spencer7c8d6582004-08-24 18:34:10 +0000[diff] [blame]104 <dl>
105 <dt><a name="BURS"><b>BURS</b></a></dt>
Bill Wendling94d371b2008-07-22 06:46:17 +0000[diff] [blame]106 <dd>Bottom Up Rewriting System&mdash;A method of instruction selection for
Chris Lattner7bf499c2004-08-24 18:53:39 +0000[diff] [blame]107 code generation. An example is the <a
108href="http://www.program-transformation.org/Transform/BURG">BURG</a> tool.</dd>
Reid Spencer7c8d6582004-08-24 18:34:10 +0000[diff] [blame]109 </dl>
110</div>
111<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]112<h3><a name="C">- C -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]113<div>
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]114 <dl>
115 <dt><a name="CSE"><b>CSE</b></a></dt>
116 <dd>Common Subexpression Elimination. An optimization that removes common
117 subexpression compuation. For example <tt>(a+b)*(a+b)</tt> has two
118 subexpressions that are the same: <tt>(a+b)</tt>. This optimization would
119 perform the addition only once and then perform the multiply (but only if
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]120 it's compulationally correct/safe).
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]121 </dl>
122</div>
123<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]124<h3><a name="D">- D -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]125<div>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]126 <dl>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]127 <dt><a name="DAG"><b>DAG</b></a></dt>
128 <dd>Directed Acyclic Graph</dd>
129 <dt><a name="Derived_Pointer"><b>Derived Pointer</b></a></dt>
130 <dd>A pointer to the interior of an object, such that a garbage collector
131 is unable to use the pointer for reachability analysis. While a derived
132 pointer is live, the corresponding object pointer must be kept in a root,
133 otherwise the collector might free the referenced object. With copying
134 collectors, derived pointers pose an additional hazard that they may be
135 invalidated at any <a href="Safe_Point">safe point</a>. This term is used in
136 opposition to <a href="#Object_Pointer">object pointer</a>.</dd>
Misha Brukmanadfa8b82004-09-05 03:00:20 +0000[diff] [blame]137 <dt><a name="DSA"><b>DSA</b></a></dt>
Misha Brukman0d68e4c2004-09-05 03:57:23 +0000[diff] [blame]138 <dd>Data Structure Analysis</dd>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]139 <dt><a name="DSE"><b>DSE</b></a></dt>
140 <dd>Dead Store Elimination</dd>
141 </dl>
142</div>
143<!-- _______________________________________________________________________ -->
Bill Wendlingd9f23c42011-09-27 18:44:01 +0000[diff] [blame]144<h3><a name="F">- F -</a></h3>
145<div>
146 <dl>
147 <dt><a name="FCA"><b>FCA</b></a></dt>
148 <dd>First Class Aggregate</dd>
149 </dl>
150</div>
151<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]152<h3><a name="G">- G -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]153<div>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]154 <dl>
155 <dt><a name="GC"><b>GC</b></a></dt>
156 <dd>Garbage Collection. The practice of using reachability analysis instead
157 of explicit memory management to reclaim unused memory.</dd>
158 </dl>
159</div>
160<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]161<h3><a name="H">- H -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]162<div>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]163 <dl>
164 <dt><a name="Heap"><b>Heap</b></a></dt>
165 <dd>In garbage collection, the region of memory which is managed using
166 reachability analysis.</dd>
167 </dl>
168</div>
169<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]170<h3><a name="I">- I -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]171<div>
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]172 <dl>
173 <dt><a name="IPA"><b>IPA</b></a></dt>
174 <dd>Inter-Procedural Analysis. Refers to any variety of code analysis that
175 occurs between procedures, functions or compilation units (modules).</dd>
176 <dt><a name="IPO"><b>IPO</b></a></dt>
177 <dd>Inter-Procedural Optimization. Refers to any variety of code
178 optimization that occurs between procedures, functions or compilation units
179 (modules).</dd>
Torok Edwin7b747ef2008-10-28 16:54:34 +0000[diff] [blame]180 <dt><a name="ISel"><b>ISel</b></a></dt>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]181 <dd>Instruction Selection.</dd>
Reid Spencer965ff462004-10-30 21:40:28 +0000[diff] [blame]182 </dl>
183</div>
184<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]185<h3><a name="L">- L -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]186<div>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]187 <dl>
Nick Lewyckya3c9f212010-04-05 05:48:47 +0000[diff] [blame]188 <dt><a name="LCSSA"><b>LCSSA</b></a></dt>
189 <dd>Loop-Closed Static Single Assignment Form</dd>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]190 <dt><a name="LICM"><b>LICM</b></a></dt>
191 <dd>Loop Invariant Code Motion</dd>
Misha Brukman2ace8cb2004-08-24 04:13:17 +0000[diff] [blame]192 <dt><a name="Load-VN"><b>Load-VN</b></a></dt>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]193 <dd>Load Value Numbering</dd>
Nick Lewyckya3c9f212010-04-05 05:48:47 +0000[diff] [blame]194 <dt><a name="LTO"><b>LTO</b></a></dt>
195 <dd>Link-Time Optimization</dd>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]196 </dl>
197</div>
Nick Lewyckya3c9f212010-04-05 05:48:47 +0000[diff] [blame]198<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]199<h3><a name="M">- M -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]200<div>
Nick Lewyckya3c9f212010-04-05 05:48:47 +0000[diff] [blame]201 <dl>
202 <dt><a name="MC"><b>MC</b></a></dt>
203 <dd>Machine Code</dd>
204 </dl>
205</div>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]206<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]207<h3><a name="O">- O -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]208<div>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]209 <dl>
210 <dt><a name="Object_Pointer"><b>Object Pointer</b></a></dt>
211 <dd>A pointer to an object such that the garbage collector is able to trace
212 references contained within the object. This term is used in opposition to
213 <a href="#Derived_Pointer">derived pointer</a>.</dd>
214 </dl>
215</div>
216
217<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]218<h3><a name="P">- P -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]219<div>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]220 <dl>
221 <dt><a name="PRE"><b>PRE</b></a></dt>
222 <dd>Partial Redundancy Elimination</dd>
223 </dl>
224</div>
Chris Lattner153827b2005-05-13 20:18:49 +0000[diff] [blame]225
226<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]227<h3><a name="R">- R -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]228<div>
Chris Lattner153827b2005-05-13 20:18:49 +0000[diff] [blame]229 <dl>
Dan Gohman67feab32008-11-07 20:29:17 +0000[diff] [blame]230 <dt><a name="RAUW"><b>RAUW</b></a></dt> <dd>An abbreviation for Replace
231 All Uses With. The functions User::replaceUsesOfWith(),
232 Value::replaceAllUsesWith(), and Constant::replaceUsesOfWithOnConstant()
233 implement the replacement of one Value with another by iterating over its
234 def/use chain and fixing up all of the pointers to point to the new value.
235 See also <a href="ProgrammersManual.html#iterate_chains">def/use chains</a>.
236 </dd>
Chris Lattner153827b2005-05-13 20:18:49 +0000[diff] [blame]237 <dt><a name="Reassociation"><b>Reassociation</b></a></dt> <dd>Rearranging
238 associative expressions to promote better redundancy elimination and other
239 optimization. For example, changing (A+B-A) into (B+A-A), permitting it to
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]240 be optimized into (B+0) then (B).</dd>
241 <dt><a name="Root"><b>Root</b></a></dt> <dd>In garbage collection, a
242 pointer variable lying outside of the <a href="#Heap">heap</a> from which
243 the collector begins its reachability analysis. In the context of code
Misha Brukmane10a3d52008-12-14 08:01:51 +0000[diff] [blame]244 generation, "root" almost always refers to a "stack root" -- a local or
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]245 temporary variable within an executing function.</dd>
Chris Lattner153827b2005-05-13 20:18:49 +0000[diff] [blame]246 </dl>
247</div>
248
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]249<!-- _______________________________________________________________________ -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame]250<h3><a name="S">- S -</a></h3>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]251<div>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]252 <dl>
Torok Edwin7b747ef2008-10-28 16:54:34 +0000[diff] [blame]253 <dt><a name="Safe_Point"><b>Safe Point</b></a></dt>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]254 <dd>In garbage collection, it is necessary to identify <a href="#Root">stack
255 roots</a> so that reachability analysis may proceed. It may be infeasible to
256 provide this information for every instruction, so instead the information
257 may is calculated only at designated safe points. With a copying collector,
258 <a href="#Derived_Pointers">derived pointers</a> must not be retained across
259 safe points and <a href="#Object_Pointers">object pointers</a> must be
260 reloaded from stack roots.</dd>
261 <dt><a name="SDISel"><b>SDISel</b></a></dt>
262 <dd>Selection DAG Instruction Selection.</dd>
Chris Lattnera3198312005-11-29 01:34:50 +0000[diff] [blame]263 <dt><a name="SCC"><b>SCC</b></a></dt>
264 <dd>Strongly Connected Component</dd>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]265 <dt><a name="SCCP"><b>SCCP</b></a></dt>
Chris Lattnera3198312005-11-29 01:34:50 +0000[diff] [blame]266 <dd>Sparse Conditional Constant Propagation</dd>
Chris Lattner4999a5c2006-02-08 16:59:49 +0000[diff] [blame]267 <dt><a name="SRoA"><b>SRoA</b></a></dt>
268 <dd>Scalar Replacement of Aggregates</dd>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]269 <dt><a name="SSA"><b>SSA</b></a></dt>
270 <dd>Static Single Assignment</dd>
Gordon Henriksen0076a672007-09-27 19:31:36 +0000[diff] [blame]271 <dt><a name="Stack_Map"><b>Stack Map</b></a></dt>
272 <dd>In garbage collection, metadata emitted by the code generator which
273 identifies <a href="#Root">roots</a> within the stack frame of an executing
274 function.</dd>
Misha Brukman00b21ae2004-08-24 01:57:02 +0000[diff] [blame]275 </dl>
276</div>
NAKAMURA Takumiaa3d6242011-04-23 00:30:22 +0000[diff] [blame]277
278</div>
Reid Spencer9f093ed2004-08-17 09:38:50 +0000[diff] [blame]279<!-- *********************************************************************** -->
280<hr>
281<address> <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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