https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102516
--- Comment #9 from Christophe Lyon <clyon at gcc dot gnu.org> ---
Indeed it works again on trunk, I bisected and it started with one of our
commits: r12-3958-g4c7731081647c22cbd249dc0faa20c3df9ed6411
Author: Richard Biener <rguent...@suse.de>
Date: Wed Sep 29 11:18:23 2021 +0200
Fix peeling for alignment with negative step
The following fixes a regression causing us to no longer peel
negative step loops for alignment. With dr_misalignment now
applying the bias for negative step we have to do the reverse
when adjusting the misalignment for peeled DRs.
2021-09-29 Richard Biener <rguent...@suse.de>
* tree-vect-data-refs.c (vect_dr_misalign_for_aligned_access):
New helper.
(vect_update_misalignment_for_peel): Use it to update
misaligned to the value necessary for an aligned access.
(vect_get_peeling_costs_all_drs): Likewise.
(vect_enhance_data_refs_alignment): Likewise.
* gcc.target/i386/vect-alignment-peeling-1.c: New testcase.
* gcc.target/i386/vect-alignment-peeling-2.c: Likewise.
We still have
FAIL: gcc.dg/vect/pr65947-13.c scan-tree-dump-times vect "condition expression
based on integer induction." 2
but based on the original report, this was already present
