http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56589
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-11 09:51:44 UTC --- Also, note that gcc 4.8 isn't the first version to actually use undefined behavior in computation of the number of iterations, just gcc 4.8 now uses the number of loop iteration information in more places than 4.7 used it.
