Hello,
This patch adds a short notice about some speed-ups in GCC 4.8 for
extremely large functions (coming from the work done on PR54146 by
several people).
OK for the wwwdocs?
Ciao!
Steven
Index: htdocs/gcc-4.8/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.8/changes.html,v
retrieving revision 1.44
diff -u -r1.44 changes.html
--- htdocs/gcc-4.8/changes.html 9 Oct 2012 18:44:55 -0000 1.44
+++ htdocs/gcc-4.8/changes.html 13 Oct 2012 22:45:59 -0000
@@ -65,10 +65,17 @@
level, and it makes PRE more aggressive.
</li>
<li>The struct reorg and matrix reorg optimizations (command-line
- options <code>-fipa-struct-reorg</code> and
- <code>-fipa-matrix-reorg</code>) have been removed. They did not
- work correctly nor with link-time optimization (LTO), hence were only
- applicable to programs consisting of a single translation unit.</li>
+ options <code>-fipa-struct-reorg</code> and
+ <code>-fipa-matrix-reorg</code>) have been removed. They did not
+ work correctly nor with link-time optimization (LTO), hence were only
+ applicable to programs consisting of a single translation unit.
+ </li>
+ <li>Several scalability bottle-necks have been removed from GCC's
+ optimization passes. Compilation of extremely large functions,
+ e.g. due to the use of the <code>flatten</code> attribute in the
+ "Eigen" C++ linear algebra templates library, is significantly
+ faster than previous releases of GCC.
+ </li>
</ul>
