[Bug target/107160] [13 regression] r13-2641-g0ee1548d96884d causes verification failure in spec2006

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107160

--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:5cbaf84c191b9a3e3cb26545c808d208bdbf2ab5

commit r13-3273-g5cbaf84c191b9a3e3cb26545c808d208bdbf2ab5
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Oct 13 14:24:05 2022 +0200

    tree-optimization/107160 - avoid reusing multiple accumulators

    Epilogue vectorization is not set up to re-use a vectorized
    accumulator consisting of more than one vector.  For non-SLP
    we always reduce to a single but for SLP that isn't happening.
    In such case we currenlty miscompile the epilog so avoid this.

            PR tree-optimization/107160
            * tree-vect-loop.cc (vect_create_epilog_for_reduction):
            Do not register accumulator if we failed to reduce it
            to a single vector.

            * gcc.dg/vect/pr107160.c: New testcase.