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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/106238] Inline optimization causes dangling
 pointer on "include/c++/12.1.0/bits/stl_tree.h"
Date: Fri, 08 Jul 2022 21:45:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106238

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---

  getLocalCopy (&local_copy);
...
  pretmp_67 =3D MEM[(struct _Rb_tree_node_base * &)&static_copy + 16];
....
  pretmp_67->_M_parent =3D &MEM[(struct _Rb_tree_header *)&local_copy +
8B]._M_header;
  _28 =3D MEM[(struct _Rb_tree_header &)&static_copy + 8]._M_node_count;
  MEM[(struct _Rb_tree_header *)&local_copy + 8B]._M_node_count =3D _28;
  MEM[(struct _Rb_tree_header *)&static_copy + 8B]._M_header._M_parent =3D =
0B;


Hmm, the warning for the IR seems correct, I cannot comment any more because
GCC would need to know the knowledge of getLocalCopy really as far as I can
tell.=