[Bug tree-optimization/88223] [8/9 Regression] Wrong code for intrinsic memmove

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88223

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 28 13:51:42 2018
New Revision: 266560

URL: https://gcc.gnu.org/viewcvs?rev=266560&root=gcc&view=rev
Log:
2018-11-28  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/88223
        * tree-ssa-sccvn.c (vn_reference_lookup_3): When skipping
        over a stored-same value may-alias store make sure to consider
        partial overlaps which are valid when TBAA reasonings do not
        apply and byte-granular overlaps are possible at all.

        * gcc.dg/torture/pr88223.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr88223.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c