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Mention that -O4 does result in more optimization when used with

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-fplugin-arg-dragonegg-enable-gcc-optzns, though it usually isn't
a win.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145486 91177308-0d34-0410-b5e6-96231b3b80d8
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Duncan Sands 2011-11-30 08:46:05 +00:00
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@ -174,7 +174,9 @@ For more details about the changes to Clang since the 2.9 release, see the
<li>The <tt>-fplugin-arg-dragonegg-enable-gcc-optzns</tt> option, which runs <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 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 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, <li>The type and constant conversion logic has been almost entirely rewritten,
fixing a multitude of obscure bugs.</li> fixing a multitude of obscure bugs.</li>