[Bug middle-end/47298] -O3 destroys beautifully vectorized code obtained at -O2

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47298
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-01-14 
20:43:15 UTC ---
It's faster for me with -O3 (Athlon64, using -march=native).