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<div class="section" id="the-llvm-lexicon">
<h1>The LLVM Lexicon<a class="headerlink" href="#the-llvm-lexicon" title="Permalink to this headline">¶</a></h1>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This document is a work in progress!</p>
</div>
<div class="section" id="definitions">
<h2>Definitions<a class="headerlink" href="#definitions" title="Permalink to this headline">¶</a></h2>
<div class="section" id="a">
<h3>A<a class="headerlink" href="#a" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>ADCE</strong></dt>
<dd>Aggressive Dead Code Elimination</dd>
<dt><strong>AST</strong></dt>
<dd><p class="first">Abstract Syntax Tree.</p>
<p>Due to Clang’s influence (mostly the fact that parsing and semantic
analysis are so intertwined for C and especially C++), the typical
working definition of AST in the LLVM community is roughly “the
compiler’s first complete symbolic (as opposed to textual)
representation of an input program”.
As such, an “AST” might be a more general graph instead of a “tree”
(consider the symbolic representation for the type of a typical “linked
list node”). This working definition is closer to what some authors
call an “annotated abstract syntax tree”.</p>
<p class="last">Consult your favorite compiler book or search engine for more details.</p>
</dd>
</dl>
</div>
<div class="section" id="b">
<h3>B<a class="headerlink" href="#b" title="Permalink to this headline">¶</a></h3>
<dl class="docutils" id="lexicon-bb-vectorization">
<dt><strong>BB Vectorization</strong></dt>
<dd>Basic-Block Vectorization</dd>
<dt><strong>BURS</strong></dt>
<dd>Bottom Up Rewriting System — A method of instruction selection for code
generation. An example is the <a class="reference external" href="http://www.program-transformation.org/Transform/BURG">BURG</a> tool.</dd>
</dl>
</div>
<div class="section" id="c">
<h3>C<a class="headerlink" href="#c" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>CSE</strong></dt>
<dd>Common Subexpression Elimination. An optimization that removes common
subexpression compuation. For example <code class="docutils literal"><span class="pre">(a+b)*(a+b)</span></code> has two subexpressions
that are the same: <code class="docutils literal"><span class="pre">(a+b)</span></code>. This optimization would perform the addition
only once and then perform the multiply (but only if it’s computationally
correct/safe).</dd>
</dl>
</div>
<div class="section" id="d">
<h3>D<a class="headerlink" href="#d" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>DAG</strong></dt>
<dd>Directed Acyclic Graph</dd>
</dl>
<dl class="docutils" id="derived-pointers">
<span id="derived-pointer"></span><dt><strong>Derived Pointer</strong></dt>
<dd>A pointer to the interior of an object, such that a garbage collector is
unable to use the pointer for reachability analysis. While a derived pointer
is live, the corresponding object pointer must be kept in a root, otherwise
the collector might free the referenced object. With copying collectors,
derived pointers pose an additional hazard that they may be invalidated at
any <a class="reference internal" href="#safe-point">safe point</a>. This term is used in opposition to <a class="reference internal" href="#object-pointer">object pointer</a>.</dd>
<dt><strong>DSA</strong></dt>
<dd>Data Structure Analysis</dd>
<dt><strong>DSE</strong></dt>
<dd>Dead Store Elimination</dd>
</dl>
</div>
<div class="section" id="f">
<h3>F<a class="headerlink" href="#f" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>FCA</strong></dt>
<dd>First Class Aggregate</dd>
</dl>
</div>
<div class="section" id="g">
<h3>G<a class="headerlink" href="#g" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>GC</strong></dt>
<dd>Garbage Collection. The practice of using reachability analysis instead of
explicit memory management to reclaim unused memory.</dd>
</dl>
</div>
<div class="section" id="h">
<h3>H<a class="headerlink" href="#h" title="Permalink to this headline">¶</a></h3>
<dl class="docutils" id="heap">
<dt><strong>Heap</strong></dt>
<dd>In garbage collection, the region of memory which is managed using
reachability analysis.</dd>
</dl>
</div>
<div class="section" id="i">
<h3>I<a class="headerlink" href="#i" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>IPA</strong></dt>
<dd>Inter-Procedural Analysis. Refers to any variety of code analysis that
occurs between procedures, functions or compilation units (modules).</dd>
<dt><strong>IPO</strong></dt>
<dd>Inter-Procedural Optimization. Refers to any variety of code optimization
that occurs between procedures, functions or compilation units (modules).</dd>
<dt><strong>ISel</strong></dt>
<dd>Instruction Selection</dd>
</dl>
</div>
<div class="section" id="l">
<h3>L<a class="headerlink" href="#l" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>LCSSA</strong></dt>
<dd>Loop-Closed Static Single Assignment Form</dd>
<dt><strong>LICM</strong></dt>
<dd>Loop Invariant Code Motion</dd>
<dt><strong>Load-VN</strong></dt>
<dd>Load Value Numbering</dd>
<dt><strong>LTO</strong></dt>
<dd>Link-Time Optimization</dd>
</dl>
</div>
<div class="section" id="m">
<h3>M<a class="headerlink" href="#m" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>MC</strong></dt>
<dd>Machine Code</dd>
</dl>
</div>
<div class="section" id="o">
<h3>O<a class="headerlink" href="#o" title="Permalink to this headline">¶</a></h3>
<dl class="docutils" id="object-pointers">
<span id="object-pointer"></span><dt><strong>Object Pointer</strong></dt>
<dd>A pointer to an object such that the garbage collector is able to trace
references contained within the object. This term is used in opposition to
<a class="reference internal" href="#derived-pointer">derived pointer</a>.</dd>
</dl>
</div>
<div class="section" id="p">
<h3>P<a class="headerlink" href="#p" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>PRE</strong></dt>
<dd>Partial Redundancy Elimination</dd>
</dl>
</div>
<div class="section" id="r">
<h3>R<a class="headerlink" href="#r" title="Permalink to this headline">¶</a></h3>
<p><strong>RAUW</strong></p>
<blockquote>
<div>Replace All Uses With. The functions <code class="docutils literal"><span class="pre">User::replaceUsesOfWith()</span></code>,
<code class="docutils literal"><span class="pre">Value::replaceAllUsesWith()</span></code>, and
<code class="docutils literal"><span class="pre">Constant::replaceUsesOfWithOnConstant()</span></code> implement the replacement of one
Value with another by iterating over its def/use chain and fixing up all of
the pointers to point to the new value. See
also <a class="reference external" href="ProgrammersManual.html#iterating-over-def-use-use-def-chains">def/use chains</a>.</div></blockquote>
<dl class="docutils">
<dt><strong>Reassociation</strong></dt>
<dd>Rearranging associative expressions to promote better redundancy elimination
and other optimization. For example, changing <code class="docutils literal"><span class="pre">(A+B-A)</span></code> into <code class="docutils literal"><span class="pre">(B+A-A)</span></code>,
permitting it to be optimized into <code class="docutils literal"><span class="pre">(B+0)</span></code> then <code class="docutils literal"><span class="pre">(B)</span></code>.</dd>
</dl>
<dl class="docutils" id="stack-roots">
<span id="roots"></span><dt><strong>Root</strong></dt>
<dd>In garbage collection, a pointer variable lying outside of the <a class="reference internal" href="#heap">heap</a> from
which the collector begins its reachability analysis. In the context of code
generation, “root” almost always refers to a “stack root” — a local or
temporary variable within an executing function.</dd>
<dt><strong>RPO</strong></dt>
<dd>Reverse postorder</dd>
</dl>
</div>
<div class="section" id="s">
<h3>S<a class="headerlink" href="#s" title="Permalink to this headline">¶</a></h3>
<dl class="docutils" id="safe-point">
<dt><strong>Safe Point</strong></dt>
<dd>In garbage collection, it is necessary to identify <a class="reference internal" href="#stack-roots">stack roots</a> so that
reachability analysis may proceed. It may be infeasible to provide this
information for every instruction, so instead the information may is
calculated only at designated safe points. With a copying collector,
<a class="reference internal" href="#derived-pointers">derived pointers</a> must not be retained across safe points and <a class="reference internal" href="#object-pointers">object
pointers</a> must be reloaded from stack roots.</dd>
<dt><strong>SDISel</strong></dt>
<dd>Selection DAG Instruction Selection.</dd>
<dt><strong>SCC</strong></dt>
<dd>Strongly Connected Component</dd>
<dt><strong>SCCP</strong></dt>
<dd>Sparse Conditional Constant Propagation</dd>
<dt><strong>SLP</strong></dt>
<dd>Superword-Level Parallelism, same as <a class="reference internal" href="#lexicon-bb-vectorization"><span>Basic-Block Vectorization</span></a>.</dd>
<dt><strong>SRoA</strong></dt>
<dd>Scalar Replacement of Aggregates</dd>
<dt><strong>SSA</strong></dt>
<dd>Static Single Assignment</dd>
<dt><strong>Stack Map</strong></dt>
<dd>In garbage collection, metadata emitted by the code generator which
identifies <a class="reference internal" href="#roots">roots</a> within the stack frame of an executing function.</dd>
</dl>
</div>
<div class="section" id="t">
<h3>T<a class="headerlink" href="#t" title="Permalink to this headline">¶</a></h3>
<dl class="docutils">
<dt><strong>TBAA</strong></dt>
<dd>Type-Based Alias Analysis</dd>
</dl>
</div>
</div>
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