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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 | 0fcb4318ea185ae337e895d1dfb93544dda8e63a (patch) | |
| tree | 7aeea86493ab5e2770790d1cd8ea4a504bbcd776 /docs | |
| parent | ec24e61ab0a22f58fedac374ef0df3e69d9a2587 (diff) | |
| download | external_llvm-0fcb4318ea185ae337e895d1dfb93544dda8e63a.zip external_llvm-0fcb4318ea185ae337e895d1dfb93544dda8e63a.tar.gz external_llvm-0fcb4318ea185ae337e895d1dfb93544dda8e63a.tar.bz2 | |
Mention that -O4 does result in more optimization when used with
-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
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/ReleaseNotes.html | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html index 9747158..a2b0177 100644 --- a/docs/ReleaseNotes.html +++ b/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> |