http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
--- Comment #40 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-01-27 16:19:26 UTC --- Btw, when I remove -fbounds-check the sizes are comparable (without prefetching), so I guess we are just better in removing bounds checking for 4.6 and that triggers size-costly loop opts such as vectorization and unrolling.
