https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97019
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Kewen Lin <li...@gcc.gnu.org>: https://gcc.gnu.org/g:e0d98ffd14487b7105de3d151122144086faa1fa commit r11-3217-ge0d98ffd14487b7105de3d151122144086faa1fa Author: Kewen Lin <li...@linux.ibm.com> Date: Tue Sep 15 22:32:55 2020 -0500 rs6000: Remove useless insns fed into lvx/stvx [PR97019] This patch is to extend the existing function find_alignment_op to check all defintions of base_reg are AND operations with mask -16B to force the alignment. If all are satifised, it passes all AND operations and instructions to function recombine_lvx_pattern and recombine_stvx_pattern, they can remove all useless ANDs further. Bootstrapped/regtested on powerpc64le-linux-gnu P8. gcc/ChangeLog: PR target/97019 * config/rs6000/rs6000-p8swap.c (find_alignment_op): Adjust to support multiple defintions which are all AND operations with the mask -16B. (recombine_lvx_pattern): Adjust to handle multiple AND operations from find_alignment_op. (recombine_stvx_pattern): Likewise. gcc/testsuite/ChangeLog: PR target/97019 * gcc.target/powerpc/pr97019.c: New test.