[Bug middle-end/91606] [9/10 regression] Optimization leads to invalid code

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91606

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-08-30
                 CC|                            |mpolacek at gcc dot gnu.org
          Component|c++                         |middle-end
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with

commit f38039b2e78510bed9e7574dbc609bed735b4a8a
Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Tue Nov 20 09:31:06 2018 +0000

    2018-11-20  Richard Biener  <rguent...@suse.de>

            PR middle-end/83215
            * alias.c (component_uses_parent_alias_set_from): Remove
            alias-set zero and TYPE_TYPELESS_STORAGE case both already
            handled in other ways.

            * g++.dg/tree-ssa/pr83215.C: New testcase.


    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@266305
138bc75d-0d04-0410-961f-82ee72b054a4