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

[jiangning.liu at amperecomputing dot com]

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

--- Comment #2 from Jiangning Liu <jiangning.liu at amperecomputing dot com> ---
memcmp doesn't return the position where they differ.