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Subject: [Bug tree-optimization/102789] libgomp.c++/simd-3.C fails after
 r12-4340 for 32 bits
Date: Mon, 08 Nov 2021 05:33:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102789

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Kewen Lin <linkw@gcc.gnu.org=
>:

https://gcc.gnu.org/g:4f024c99a05f1c6852d1e5daad4a172f4cdd24a1

commit r10-10257-g4f024c99a05f1c6852d1e5daad4a172f4cdd24a1
Author: Kewen Lin <linkw@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)=