[Bug fortran/84867] Wrong code generated, except at -O0, with inappropriate Warning: iteration 1 invokes undefined behavior [-Waggressive-loop-optimizations]

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84867

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Lack of warning doesn't imply the code is valid.