[Bug tree-optimization/18437] vectorizer failed for matrix multiplication

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=18437

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For the original testcase in comment #0, with `-O3 -fno-vect-cost-model` GCC
can vectorize it on aarch64 but not on x86_64.