[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
Log:
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
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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