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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/98130] [11 regression] placement new fails on
 webkit-gtk-2.28.4 since r11-4745-g58c9de46541ade79
Date: Fri, 04 Dec 2020 07:19:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98130

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  The issue is that placement new is _not_ __attribute__((malloc)=
),
it makes PTA consider the object not escaping and then we have DSE do

;; Function append (_ZL6appendPi, funcdef_no=3D1, decl_uid=3D2355, cgraph_u=
id=3D2,
symbol_order=3D3)

  Deleted dead store: MEM[(int * *)_4] =3D value_5(D);

__attribute__((always_inline))
void append (int * value)
{
  void * _2;
  void * _4;

  <bb 2> :
  _2 =3D p;
  _4 =3D operator new (8, _2);
  return;

}=