[Bug tree-optimization/88398] vectorization failure for a small loop to do byte comparison

[guojiufu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88398

--- Comment #43 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
To handle vectorization for this kind of code, it needs to overcome the hard
issue mentioned in comment #5: the loop has 2 exits.