https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102789
--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Kewen Lin <li...@gcc.gnu.org>: https://gcc.gnu.org/g:6cce26752d8431a1ef6d3f9a97fa0ee2e9f96816 commit r9-9815-g6cce26752d8431a1ef6d3f9a97fa0ee2e9f96816 Author: Kewen Lin <li...@linux.ibm.com> Date: Mon Oct 25 21:05:02 2021 -0500 vect: Don't update inits for simd_lane_access DRs [PR102789] As PR102789 shows, when vectorizer does some peelings for alignment in prologues, function vect_update_inits_of_drs would update the inits of some drs. But as the failed case, we shouldn't update the dr for simd_lane_access, it has the fixed-length storage mainly for the main loop, the update can make the access out of bound and access the unexpected element. gcc/ChangeLog: PR tree-optimization/102789 * tree-vect-loop-manip.c (vect_update_inits_of_drs): Do not update inits of simd_lane_access. (cherry picked from commit f3dbd3f36d55178d0a9e4431043cbc950524969a)
