http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57051
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> 2013-04-24 08:10:21 UTC --- Well, one thing differs, 4.7 with -O3 aligns 'total' to .align 16 whereas 4.8 with -O3 -fno-tree-vectorize has .align 4