https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87306
--- Comment #1 from Kewen Lin <linkw at gcc dot gnu.org> --- Confirmed. This issue is power7 and below only, since it implicitly sets -mno-allow-movmisalign, which disallow unaligned load/store in vectorization. The proposed fix to guard the case under vect_hw_misalig on power targets.
