http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53125
--- Comment #8 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-05-11 09:33:19 UTC --- The alias stmt walking time is because of the redundant store removal code and because of PR52054 it has to re-do the walks (there are 7200 stores in the function).