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initial descriptions of count intrinsics

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llvm-svn: 21677
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Andrew Lenharth 2005-05-03 18:01:48 +00:00
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@ -145,6 +145,13 @@
<li><a href="#i_isunordered">'<tt>llvm.isunordered</tt>' Intrinsic</a></li>
</ol>
</li>
<li><a href="#int_count">Bit counting Intrinsics</a>
<ol>
<li><a href="#int_ctpop">'<tt>llvm.ctpop</tt>' Intrinsic </a></li>
<li><a href="#int_cttz">'<tt>llvm.cttz</tt>' Intrinsic </a></li>
<li><a href="#int_ctlz">'<tt>llvm.ctlz</tt>' Intrinsic </a></li>
</ol>
</li>
<li><a href="#int_debugger">Debugger intrinsics</a></li>
</ol>
</li>
@ -3029,6 +3036,116 @@ false.
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="int_count">Bit Counting Intrinsics</a>
</div>
<div class="doc_text">
<p>
LLVM provides intrinsics for a few important bit counting operations.
These allow efficient code generation for some algorithms.
</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="int_ctpop">'<tt>llvm.ctpop</tt>' Intrinsic</a>
</div>
<div class="doc_text">
<h5>Syntax:</h5>
<pre>
declare int %llvm.ctpop(int &lt;src&gt;)
</pre>
<h5>Overview:</h5>
<p>
The '<tt>llvm.ctpop</tt>' intrinsic counts the number of ones in a variable.
</p>
<h5>Arguments:</h5>
<p>
The only argument is the value to be counted.
</p>
<h5>Semantics:</h5>
<p>
The '<tt>llvm.ctpop</tt>' intrinsic counts the 1's in a variable.
</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="int_cttz">'<tt>llvm.cttz</tt>' Intrinsic</a>
</div>
<div class="doc_text">
<h5>Syntax:</h5>
<pre>
declare int %llvm.cttz(int &lt;src&gt;)
</pre>
<h5>Overview:</h5>
<p>
The '<tt>llvm.cttz</tt>' intrinsic counts the number of trailing zeros.
</p>
<h5>Arguments:</h5>
<p>
The only argument is the value to be counted.
</p>
<h5>Semantics:</h5>
<p>
The '<tt>llvm.cttz</tt>' intrinsic counts the trailing zeros in a variable. If the src == 0
then the result is the size in bits of the type of src.
</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="int_ctlz">'<tt>llvm.ctlz</tt>' Intrinsic</a>
</div>
<div class="doc_text">
<h5>Syntax:</h5>
<pre>
declare int %llvm.ctlz(int &lt;src&gt;)
</pre>
<h5>Overview:</h5>
<p>
The '<tt>llvm.ctlz</tt>' intrinsic counts the number of leading zeros in a variable.
</p>
<h5>Arguments:</h5>
<p>
The only argument is the value to be counted.
</p>
<h5>Semantics:</h5>
<p>
The '<tt>llvm.ctlz</tt>' intrinsic counts the leading zeros in a variable. If the src == 0
then the result is the size in bits of the type of src.
</p>
</div>
<!-- ======================================================================= -->