https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71505
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2016-06-13 Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- I can see that the assert might trigger but can't reproduce it either with your testcase. A fix would be to make the assert match the comment (the group is then split because of the step <= (init_b - init_a) test).