[Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84737

--- Comment #19 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Apr 19 12:41:42 2018
New Revision: 259493

URL: https://gcc.gnu.org/viewcvs?rev=259493&root=gcc&view=rev
Log:
2018-04-19  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/84737
        * tree-vect-data-refs.c (vect_copy_ref_info): New function
        copying restrict info.
        (vect_setup_realignment): Use it.
        * tree-vectorizer.h (vect_copy_ref_info): Declare.
        * tree-vect-stmts.c (vectorizable_store): Copy ref info from
        the first DR to all generated stores.
        (vectorizable_load): Likewise for loads.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-vect-data-refs.c
    trunk/gcc/tree-vect-stmts.c
    trunk/gcc/tree-vectorizer.h