Document the llvm.isnan intrinsic

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14131 91177308-0d34-0410-b5e6-96231b3b80d8

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@@ -114,8 +114,8 @@
       </li>
       <li><a href="#int_os">Operating System Intrinsics</a>
         <ol>
-          <li><a href="#i_readport">'<tt>llvm.readport</tt>'   Intrinsic</a></li>
-          <li><a href="#i_writeport">'<tt>llvm.writeport</tt>'   Intrinsic</a></li>
+          <li><a href="#i_readport">'<tt>llvm.readport</tt>' Intrinsic</a></li>
+          <li><a href="#i_writeport">'<tt>llvm.writeport</tt>' Intrinsic</a></li>
           <li><a href="#i_readio">'<tt>llvm.readio</tt>'   Intrinsic</a></li>
           <li><a href="#i_writeio">'<tt>llvm.writeio</tt>'   Intrinsic</a></li>
         </ol>
@@ -124,6 +124,7 @@
           <li><a href="#i_memcpy">'<tt>llvm.memcpy</tt>' Intrinsic</a></li>
           <li><a href="#i_memmove">'<tt>llvm.memmove</tt>' Intrinsic</a></li>
           <li><a href="#i_memset">'<tt>llvm.memset</tt>' Intrinsic</a></li>
+          <li><a href="#i_isnan">'<tt>llvm.isnan</tt>' Intrinsic</a></li>
         </ol>
       </li>
       <li><a href="#int_debugger">Debugger intrinsics</a></li>
@@ -2528,6 +2529,41 @@ this can be specified as the fourth argument, otherwise it should be set to 0 or
 </div>
 
 
+<!-- _______________________________________________________________________ -->
+<div class="doc_subsubsection">
+  <a name="i_isnan">'<tt>llvm.isnan</tt>' Intrinsic</a>
+</div>
+
+<div class="doc_text">
+
+<h5>Syntax:</h5>
+<pre>
+  call bool (&lt;float or double&gt;)* %llvm.isnan(&lt;float or double&gt; Val)
+</pre>
+
+<h5>Overview:</h5>
+
+<p>
+The '<tt>llvm.isnan</tt>' intrinsic returns true if the specific floating point
+value is a NAN.
+</p>
+
+<h5>Arguments:</h5>
+
+<p>
+The argument is a floating point number.
+</p>
+
+<h5>Semantics:</h5>
+
+<p>
+If the argument is a SNAN or QNAN, it returns true, otherwise false.
+</p>
+</div>
+
+
+
+
 <!-- ======================================================================= -->
 <div class="doc_subsection">
   <a name="int_debugger">Debugger Intrinsics</a>