https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86936
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Note to GIMPLE &a[1][i_3(D)] is just address-computation and carries no semantics so you can't assume that i_3(D) isn't negative and thus ends up accessing "123". For the C testcase you of course can, but once we're in GIMPLE you cannot. If there's a load like _7 = a[1][i_3(D)]; you _can_ assume that i_3(D) fits in the respective array types domain.
