http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34949
--- Comment #30 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-04 09:20:36 UTC --- Ah, I guess it is sink_clobbers, which would need to be tought to drop MEM_REF clobbers instead of sinking them if the target bb is no longer dominated by the bb with the SSA_NAME definition.
