[Bug tree-optimization/86504] vectorization failure for a nest loop

[jiangning.liu at amperecomputing dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86504

--- Comment #1 from Jiangning Liu <jiangning.liu at amperecomputing dot com> ---
Created attachment 44387
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44387&action=edit
bad vectorizatoin result for boundary size 8