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document 'opaque' types

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21535 91177308-0d34-0410-b5e6-96231b3b80d8
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docs/LangRef.html
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@ -39,6 +39,7 @@
<li><a href="#t_pointer">Pointer Type</a></li> <li><a href="#t_pointer">Pointer Type</a></li>
<li><a href="#t_struct">Structure Type</a></li> <li><a href="#t_struct">Structure Type</a></li>
<li><a href="#t_packed">Packed Type</a></li> <li><a href="#t_packed">Packed Type</a></li>
<li><a href="#t_opaque">Opaque Type</a></li>
</ol> </ol>
</li> </li>
</ol> </ol>
@ -750,18 +751,27 @@ reference to another object, which must live in memory.</p>
<!-- _______________________________________________________________________ --> <!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"> <a name="t_packed">Packed Type</a> </div> <div class="doc_subsubsection"> <a name="t_packed">Packed Type</a> </div>
<div class="doc_text"> <div class="doc_text">
<h5>Overview:</h5> <h5>Overview:</h5>
<p>A packed type is a simple derived type that represents a vector <p>A packed type is a simple derived type that represents a vector
of elements. Packed types are used when multiple primitive data of elements. Packed types are used when multiple primitive data
are operated in parallel using a single instruction (SIMD). are operated in parallel using a single instruction (SIMD).
A packed type requires a size (number of A packed type requires a size (number of
elements) and an underlying primitive data type. Packed types are elements) and an underlying primitive data type. Packed types are
considered <a href="#t_firstclass">first class</a>.</p> considered <a href="#t_firstclass">first class</a>.</p>
<h5>Syntax:</h5> <h5>Syntax:</h5>
<pre> &lt; &lt;# elements&gt; x &lt;elementtype&gt; &gt;<br></pre>
<pre>
&lt; &lt;# elements&gt; x &lt;elementtype&gt; &gt;
</pre>
<p>The number of elements is a constant integer value, elementtype may <p>The number of elements is a constant integer value, elementtype may
be any integral or floating point type.</p> be any integral or floating point type.</p>
<h5>Examples:</h5> <h5>Examples:</h5>
<table class="layout"> <table class="layout">
<tr class="layout"> <tr class="layout">
<td class="left"> <td class="left">
@ -778,6 +788,38 @@ be any integral or floating point type.</p>
</table> </table>
</div> </div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"> <a name="t_opaque">Opaque Type</a> </div>
<div class="doc_text">
<h5>Overview:</h5>
<p>Opaque types are used to represent unknown types in the system. This
corresponds (for example) to the C notion of a foward declared structure type.
In LLVM, opaque types can eventually be resolved to any type (not just a
structure type).</p>
<h5>Syntax:</h5>
<pre>
opaque
</pre>
<h5>Examples:</h5>
<table class="layout">
<tr class="layout">
<td class="left">
<tt>opaque</tt>
</td>
<td class="left">
An opaque type.<br/>
</td>
</tr>
</table>
</div>
<!-- *********************************************************************** --> <!-- *********************************************************************** -->
<div class="doc_section"> <a name="constants">Constants</a> </div> <div class="doc_section"> <a name="constants">Constants</a> </div>
<!-- *********************************************************************** --> <!-- *********************************************************************** -->