From 0fcb4318ea185ae337e895d1dfb93544dda8e63a Mon Sep 17 00:00:00 2001 From: Duncan Sands Date: Wed, 30 Nov 2011 08:46:05 +0000 Subject: 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 --- docs/ReleaseNotes.html | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'docs') 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
  • The -fplugin-arg-dragonegg-enable-gcc-optzns 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.
    • + though: it may cause the plugin to crash. Setting the optimization level + to -O4 when using this option will optimize even harder, though + this usually doesn't result in any improvement over -O3.
  • The type and constant conversion logic has been almost entirely rewritten, fixing a multitude of obscure bugs.
    • -- cgit v1.1