http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51974
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-26 15:14:23 UTC --- I can reproduce random comparison failures as well, even with checking enabled, on openSUSE Factory x86_64. I wasn't yet able to reproduce them locally though. I'm trying again.