https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118634
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Note the regression is solely because of size: 28-7, last_iteration: 28-7 Loop size: 28 - Estimated size after unrolling: 28 + Estimated size after unrolling: 42 we have 12 insns estimated to be eliminated (the dump is unfortunate now, I'll try fixing that), that's two more because not_defined () is no longer optimistically assumed to be eliminated to 1/3 of its size.