https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86884
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- It's invalid in GIMPLE as well. You are accessing the storage through p->c[n] which constrains the accesses to the array size of c (it is not a trailing array).