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Subject: [Bug tree-optimization/96075] [8/9 Regression] bogus alignment for
 negative step grouped access
Date: Wed, 02 Dec 2020 13:23:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96075

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:53d76fe758a3e8e0c1f049e75030278427a8fe5d

commit r9-9094-g53d76fe758a3e8e0c1f049e75030278427a8fe5d
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jul 6 16:26:50 2020 +0200

    tree-optimization/96075 - fix bogus misalignment calculation

    This fixes bogus misalignment calculation for negative steps
    since an assertion a previous comment indicated no longer holds:

          /* DR_STEP(dr) is the same as -TYPE_SIZE of the scalar type,
             otherwise we wouldn't be here.  */

    Thus the following replaces DR_STEP by -TYPE_SIZE.

    2020-07-06  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/96075
            * tree-vect-data-refs.c (vect_compute_data_ref_alignment): Use
            TYPE_SIZE_UNIT of the vector component type instead of DR_STEP
            for the misalignment calculation for negative step.

            * gcc.dg/vect/slp-46.c: New testcase.

    (cherry picked from commit dccbf1e2a6e544f71b4a5795f0c79015db019fc3)=