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| author | Duncan Sands <baldrick@free.fr> | 2011-11-30 08:46:05 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2011-11-30 08:46:05 +0000 |
| commit | e9adf5c8608f7c5c52356433d59ad4f2672d0050 (patch) | |
| tree | ec571da0df0853d9c447a00c33c2275fa80321a1 /llvm/docs | |
| parent | 0a672eaf9e1bc5f25e8105b503f9ab5dcf176749 (diff) | |
| download | bcm5719-llvm-e9adf5c8608f7c5c52356433d59ad4f2672d0050.tar.gz bcm5719-llvm-e9adf5c8608f7c5c52356433d59ad4f2672d0050.zip | |
Mention that -O4 does result in more optimization when used with
-fplugin-arg-dragonegg-enable-gcc-optzns, though it usually isn't
a win.
llvm-svn: 145486
Diffstat (limited to 'llvm/docs')
| -rw-r--r-- | llvm/docs/ReleaseNotes.html | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/docs/ReleaseNotes.html b/llvm/docs/ReleaseNotes.html index 97471586dfb..a2b0177dbae 100644 --- a/llvm/docs/ReleaseNotes.html +++ b/llvm/docs/ReleaseNotes.html @@ -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 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> |
