https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114178
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. There is a dup of this bug somewhere. Basically the vectorizer is causing some IR which shows up the warning. Yes even though you disable the vector instruction sets, the vectorizer still happens, specifically with the idea that `vector(8) char` stores could be done using the 64bit GPRs
