https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96109
--- Comment #9 from CVS 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:94f28340513753ba94ab483e93ce1d096842a5ad commit r12-4706-g94f28340513753ba94ab483e93ce1d096842a5ad Author: Richard Biener <rguent...@suse.de> Date: Mon Oct 25 13:39:07 2021 +0200 Move negative stride bias out of dr_misalignment This moves applying of a bias for negative stride accesses out of dr_misalignment in favor of a more general optional offset argument. The negative bias is now computed by get_load_store_type and applied accordingly to determine the alignment support scheme. Likewise the peeling/versioning code is adjusted albeit that still assumes we'll end up with VMAT_CONTIGUOUS_DOWN or VMAT_CONTIGUOUS_REVERSE but at least when not so (VMAT_STRIDED_SLP is one possibility) then get_load_store_type will _not_ falsely report an aligned access but instead an access with known misalignment. This fixes PR96109. 2021-10-25 Richard Biener <rguent...@suse.de> PR tree-optimization/96109 * tree-vectorizer.h (dr_misalignment): Add optional offset parameter. * tree-vect-data-refs.c (dr_misalignment): Likewise. Remove offset applied for negative stride accesses. (vect_enhance_data_refs_alignment): Compute negative stride access offset and pass it to dr_misalignment. * tree-vect-stmts.c (get_negative_load_store_type): Pass negative offset to dr_misalignment. (get_group_load_store_type): Likewise. (get_load_store_type): Likewise. (vectorizable_store): Remove asserts about alignment. (vectorizable_load): Likewise.
