[wwwdocs] libquadmath: Mention in the news, add to changes.html

Index: index.html
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RCS file: /cvs/gcc/wwwdocs/htdocs/index.html,v
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@@ -50,6 +50,13 @@ 
 <h2 style="margin-top:0pt;" id="news">News</h2>
 
 <dl class="news">
+<dt>November 16, 2010</dt>
+<dd><a href="gcc-4.6/changes.html">GCC 4.6.0</a> will include the
+<tt>libquadmath</tt> library, which provides quad-precision mathematical
+functions on targets supporting the <tt>__float128</tt> datatype. The
+library is used to provide on such targets the <tt>REAL(16)</tt> type in GNU
+Fortran compiler. The library has been contributed by Fran&ccedil;ois-Xavier
+Coudert.</dd>
 
 <dt>October 1, 2010</dt>
 <dd><a href="gcc-4.4/">GCC 4.4.5</a> has been released.</dd>
Index: gcc-4.6/changes.html
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RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.6/changes.html,v
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--- gcc-4.6/changes.html	7 Nov 2010 13:48:21 -0000	1.58
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@@ -38,6 +38,13 @@ 
     generic link-time optimization framework (LTO) introduced
     in <a href="../gcc-4.5/changes.html">GCC 4.5.0</a>.</li>
 
+    <li>GCC now ships with the LGPL-licensed <tt>libquadmath</tt> library,
+    which provides for targets with a <tt>__float128</tt> datatype
+    quad-precision mathematical functions. <tt>__float128</tt> is available
+    for targets on 32-bit x86, x86-64 and Itanium architectures. The
+    <tt>libquadmath</tt> library is automatically build on such targets
+    when building the Fortran compiler.</tt>
+
 </ul>
 
 <h2>General Optimizer Improvements</h2>
@@ -181,6 +188,13 @@ 
 
 <h3 id="fortran">Fortran</h3>
   <ul>
+    <li>On systems supporting the <tt>libquadmath</tt> library, GNU Fortran
+    now also supports a quad-precision, <tt>kind=16</tt> floating-point 
+    data type (<tt>REAL(16)</tt>, <tt>COMPLEX(16)</tt>). As the data type is not
+    fully supported in hardware, calculations might be one to two orders
+    of magnitute slower than with the 4, 8 or 10 bytes floating-point data types.
+    This change does not affect systems which support <tt>REAL(16)</tt> in
+    hardware nor those which do not support  <tt>libquadmath</tt>.</li>
     <li>Much improved compile time for large array constructors.</li>
     <li>Improved diagnostics, especially with
       <code>-fwhole-file</code>.</li>