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

[Joost.VandeVondele at pci dot uzh.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47298

--- Comment #3 from Joost VandeVondele <Joost.VandeVondele at pci dot uzh.ch> 
2011-01-14 21:02:04 UTC ---
Actually, also on AMD I have at -O2 9.4s -O3 11.8s

model           : 9
model name      : AMD Opteron(tm) Processor 6176 SE
stepping        : 1