[Bug target/78807] Loop optimization trigger bus error

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78807

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you try GCC 6+?  Looks like one of the (known) alignment issues with the
vectorizer that are notoriously hard to backport.