[Bug tree-optimization/94375] 548.exchange2_r run time is 8-18% worse than GCC 9 at -Ofast -march=native

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94375

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
Try -mprefer-vector-width=128,256-bit vectorization is not helpful for 548
according to our experience.