[Bug tree-optimization/97236] [8 Regression] g:e93428a8b056aed83a7678 triggers vlc miscompile

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97236

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-8 branch has been updated by Kyrylo Tkachov
<ktkac...@gcc.gnu.org>:

https://gcc.gnu.org/g:de0ede7625f6c4d4bbd2caaf363032b0da80cf69

commit r8-10757-gde0ede7625f6c4d4bbd2caaf363032b0da80cf69
Author: Matthias Klose <d...@ubuntu.com>
Date:   Tue Oct 6 13:41:37 2020 +0200

    Backport fix for PR/tree-optimization/97236 - fix bad use of
VMAT_CONTIGUOUS

    This avoids using VMAT_CONTIGUOUS with single-element interleaving
    when using V1mode vectors.  Instead keep VMAT_ELEMENTWISE but
    continue to avoid load-lanes and gathers.

    2020-10-01  Richard Biener  <rguent...@suse.de>

            PR tree-optimization/97236
            * tree-vect-stmts.c (get_group_load_store_type): Keep
            VMAT_ELEMENTWISE for single-element vectors.

            * gcc.dg/vect/pr97236.c: New testcase.

    (cherry picked from commit 1ab88985631dd2c5a5e3b5c0dce47cf8b6ed2f82)