[llvm-commits] [llvm] r145486 - /llvm/trunk/docs/ReleaseNotes.html

Duncan Sands baldrick at free.fr
Wed Nov 30 00:46:06 PST 2011

Author: baldrick
Date: Wed Nov 30 02:46:05 2011
New Revision: 145486

URL: http://llvm.org/viewvc/llvm-project?rev=145486&view=rev
Mention that -O4 does result in more optimization when used with
-fplugin-arg-dragonegg-enable-gcc-optzns, though it usually isn't
a win.


Modified: llvm/trunk/docs/ReleaseNotes.html
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/ReleaseNotes.html?rev=145486&r1=145485&r2=145486&view=diff
--- llvm/trunk/docs/ReleaseNotes.html (original)
+++ llvm/trunk/docs/ReleaseNotes.html Wed Nov 30 02:46:05 2011
@@ -174,7 +174,9 @@
   <li>The <tt>-fplugin-arg-dragonegg-enable-gcc-optzns</tt> option, which runs
       GCC's optimizers as well as LLVM's, now works much better.  This is the
       option to use if you want ultimate performance! It is still experimental
-      though: it may cause the plugin to crash.</li>
+      though: it may cause the plugin to crash.  Setting the optimization level
+      to <tt>-O4</tt> when using this option will optimize even harder, though
+      this usually doesn't result in any improvement over <tt>-O3<tt>.</li>
   <li>The type and constant conversion logic has been almost entirely rewritten,
       fixing a multitude of obscure bugs.</li>

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