[Bug middle-end/80222] may_alias folded away

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80222

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Mar 28 10:10:01 2017
New Revision: 246527

URL: https://gcc.gnu.org/viewcvs?rev=246527&root=gcc&view=rev
Log:
2017-03-28  Richard Biener  <rguent...@suse.de>

        PR middle-end/80222
        * gimple-fold.c (gimple_fold_indirect_ref): Do not touch
        TYPE_REF_CAN_ALIAS_ALL references.
        * fold-const.c (fold_indirect_ref_1): Likewise.

        * g++.dg/pr80222.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/pr80222.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/gimple-fold.c
    trunk/gcc/testsuite/ChangeLog