[Bug tree-optimization/108912] A -Wstringop-overflow false positive in aarch64-linux-gnu-gcc 12.2.0

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108912

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So the vectorizer is over vectorizing this code slightly.
The easiest fix is at add:

    if (stage_num_col > 12) __builtin_unreachable();

and

    if (stage_num_row > 12) __builtin_unreachable();

I thought there was another bug related to this warning/vectorizer over
vectorizing but I can't find it right now.