[Bug tree-optimization/91091] [missed optimization] Missing optimization in unaliased pointers

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91091

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Jul  5 12:48:42 2019
New Revision: 273134

URL: https://gcc.gnu.org/viewcvs?rev=273134&root=gcc&view=rev
Log:
2019-07-05  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/91091
        * tree-ssa-sccvn.c (vn_reference_lookup_3): Overlap of
        accesses can happen with -fno-strict-aliasing.

        * gcc.dg/tree-ssa/pr91091-1.c: New testcase.
        * gcc.dg/tree-ssa/ssa-fre-61.c: Adjust.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr91091-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-61.c
    trunk/gcc/tree-ssa-sccvn.c