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Subject: [Bug tree-optimization/98854] [11 Regression] cray benchmark is
 about 15% slower since r11-4428-g4a369d199bf2f34e
Date: Wed, 27 Jan 2021 16:33:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98854

--- Comment #9 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:c91db798ec65b3e55f2380ca1530ecb71544f1bb

commit r11-6934-gc91db798ec65b3e55f2380ca1530ecb71544f1bb
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Jan 27 15:20:58 2021 +0100

    tree-optimization/98854 - avoid some PHI BB vectorization

    This avoids cases of PHI node vectorization that just causes us
    to insert vector CTORs inside loops for values only required
    outside of the loop.

    2021-01-27  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/98854
            * tree-vect-slp.c (vect_build_slp_tree_2): Also build
            PHIs from scalars when the number of CTORs matches the
            number of children.

            * gcc.dg/vect/bb-slp-pr98854.c: New testcase.=