docs/Lexicon.html

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   5   <title>The LLVM Lexicon</title>
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   7   <meta name="author" content="Various">
   8   <meta name="description"
   9   content="A glossary of terms used with the LLVM project.">
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  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
  83 href="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>
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