wine users - Mar 2011 - gcc -O3 -march=barcelona breaks Wine

I've been playing with compilation options to try and improve response
times, I haven't compiled the results, which in hindsight I now realise I
should have!  (Never mind!)

However, I have got the following results building with GCC 4.5.1:

gcc -O3
Works fine

gcc -march=barcelona
Works fine

gcc -O2 -march=barcelona -fgcse-after-reload -finline-functions -fipa_cp_clone
-fpredictive-commoning -ftree-pre-partial-partial -ftree-vectorize
-funswitch-loops
Works fine

gcc -O3 -march=barcelona
explorer crashes out (three times?)
rundll32 crashes out
winecfg loads

gcc -O3 -march=barcelona basically breaks something badly.  I'm not sure if
Wine should support -march or what the policy is, or if this is even a Wine bug,
so I thought I would post it here for comment.

I see GCC 4.5.2 is released and these
(http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.2)
are the fixes, but I don't know if any of them would resolve the problem.  I
guess I can build 4.5.2 and find out...

I have individually built explorer, rundll32 and ntdll32 with -O3
-march=barcelona and Wine runs fine, so I'm not sure which part of Wine is
actually dying.

KenSharp.  Bad news.  Wine only normally supports up to -O2 in the standard
makefile config.

That -O3 works and gcc -O3 -march=barcelona fails suggests memory alignment
issues.

Those can be down right annoying to chase down.  Basically you have gone into
the Gcc no mans land with -O3.

-O3 with gcc has been known in the past to make some copy-protection things
fail.  Yes there is such thing as over optimizing wine.