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  <title>The LLVM Lexicon</title>
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  <meta name="author" content="Various">
  <meta name="description" 
  content="A glossary of terms used with the LLVM project.">
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<div class="doc_title">The LLVM Lexicon</div>
<p class="doc_warning">NOTE: This document is a work in progress!</p>
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<div class="doc_section">Table Of Contents</div>
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<div class="doc_text">
  <table>
    <tr><th colspan="8"><b>- <a href="#A">A</a> -</b></th></tr>
    <tr>
      <td><a href="#ADCE">ADCE</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#B">B</a> -</b></th></tr>
    <tr>
      <td><a href="#BURS">BURS</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#C">C</a> -</b></th></tr>
    <tr>
      <td><a href="#CSE">CSE</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#D">D</a> -</b></th></tr>
    <tr>
      <td><a href="#DSA">DSA</a></td>
      <td><a href="#DSE">DSE</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#I">I</a> -</b></th></tr>
    <tr>
      <td><a href="#IPA">IPA</a></td>
      <td><a href="#IPO">IPO</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#L">L</a> -</b></th></tr>
    <tr>
      <td><a href="#LCSSA">LCSSA</a></td>
      <td><a href="#LICM">LICM</a></td>
      <td><a href="#Load-VN">Load-VN</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#P">P</a> -</b></th></tr>
    <tr>
      <td><a href="#PRE">PRE</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#R">R</a> -</b></th></tr>
    <tr>
      <td><a href="#Reassociation">Reassociation</a></td>
    </tr>
    <tr><th colspan="8"><b>- <a href="#S">S</a> -</b></th></tr>
    <tr>
      <td><a href="#SCC">SCC</a></td>
      <td><a href="#SCCP">SCCP</a></td>
      <td><a href="#SRoA">SRoA</a></td>
      <td><a href="#SSA">SSA</a></td>
    </tr>
  </table>
</div>

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<div class="doc_section">Definitions</div>
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<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="A">- A -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="ADCE"><b>ADCE</b></a></dt>
    <dd>Aggressive Dead Code Elimination</dd>
  </dl>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="B">- B -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="BURS"><b>BURS</b></a></dt>
    <dd>Bottom Up Rewriting System - A method of instruction selection for
        code generation.  An example is the <a 
href="http://www.program-transformation.org/Transform/BURG">BURG</a> tool.</dd>
  </dl>
</div>
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<div class="doc_subsection"><a name="C">- C -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="CSE"><b>CSE</b></a></dt>
    <dd>Common Subexpression Elimination. An optimization that removes common
    subexpression compuation. For example <tt>(a+b)*(a+b)</tt> has two
    subexpressions that are the same: <tt>(a+b)</tt>. This optimization would
    perform the addition only once and then perform the multiply (but only if
    its compulationally correct/safe).
  </dl>
</div>
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<div class="doc_subsection"><a name="D">- D -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="DSA"><b>DSA</b></a></dt>
    <dd>Data Structure Analysis</dd>
    <dt><a name="DSE"><b>DSE</b></a></dt>
    <dd>Dead Store Elimination</dd>
  </dl>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="I">- I -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="IPA"><b>IPA</b></a></dt>
    <dd>Inter-Procedural Analysis. Refers to any variety of code analysis that
    occurs between procedures, functions or compilation units (modules).</dd>
    <dt><a name="IPO"><b>IPO</b></a></dt>
    <dd>Inter-Procedural Optimization. Refers to any variety of code
    optimization that occurs between procedures, functions or compilation units
    (modules).</dd>
  </dl>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="L">- L -</a></div>
<div class="doc_text">
  <dl>
  	<dt><a name="LCSSA"><b>LCSSA</b></a></dt>
  	<dd>Loop-Closed Static Single Assignment Form</dd>
    <dt><a name="LICM"><b>LICM</b></a></dt>
    <dd>Loop Invariant Code Motion</dd>
    <dt><a name="Load-VN"><b>Load-VN</b></a></dt>
    <dd>Load Value Numbering</dd>
  </dl>
</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="P">- P -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="PRE"><b>PRE</b></a></dt>
    <dd>Partial Redundancy Elimination</dd>
  </dl>
</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="R">- R -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="Reassociation"><b>Reassociation</b></a></dt> <dd>Rearranging
    associative expressions to promote better redundancy elimination and other
    optimization.  For example, changing (A+B-A) into (B+A-A), permitting it to
    be optimized into (B+0) then (B).
  </dl>
</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="S">- S -</a></div>
<div class="doc_text">
  <dl>
    <dt><a name="SCC"><b>SCC</b></a></dt>
    <dd>Strongly Connected Component</dd>
    <dt><a name="SCCP"><b>SCCP</b></a></dt>
    <dd>Sparse Conditional Constant Propagation</dd>
    <dt><a name="SRoA"><b>SRoA</b></a></dt>
    <dd>Scalar Replacement of Aggregates</dd>
    <dt><a name="SSA"><b>SSA</b></a></dt>
    <dd>Static Single Assignment</dd>
  </dl>
</div>
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