https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119155
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:adb14c7625178b501389c2d7d7c2feec37da7a19 commit r15-8047-gadb14c7625178b501389c2d7d7c2feec37da7a19 Author: Richard Biener <rguent...@suse.de> Date: Fri Mar 7 12:57:42 2025 +0100 tree-optimization/119155 - wrong aligned access for vectorized packed access When doing strided SLP vectorization we use the wrong alignment for the possibly piecewise access of the vector elements for loads and stores. While we are carefully using element aligned loads and stores that isn't enough for the case the original scalar accesses are packed. The following instead honors larger alignment when present but correctly falls back to the original scalar alignment used. PR tree-optimization/119155 * tree-vect-stmts.cc (vectorizable_store): Do not always use vector element alignment for VMAT_STRIDED_SLP but a more correct alignment towards both ends. (vectorizable_load): Likewise. * gcc.dg/vect/pr119155.c: New testcase.
