https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82563
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2017-10-17 Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Target Milestone|--- |8.0 Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. This is because when we build SCOPs we break LC-SSA with /* For our out-of-SSA we need a block on s->entry, similar to how we include the LCSSA block in the region. */ s->entry = single_pred_edge (split_edge (s->entry)); because in this case we split the loop exit edge and we expect the LC SSA PHI node to be in the exit block rather than its single successor.