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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96722] New: [8/9/10/11 Regression] Clobbers
 on NULL since r8-1519
Date: Thu, 20 Aug 2020 09:30:22 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: needs-bisection, needs-reduction
X-Bugzilla-Severity: normal
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X-Bugzilla-Status: UNCONFIRMED
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96722

            Bug ID: 96722
           Summary: [8/9/10/11 Regression] Clobbers on NULL since r8-1519
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: needs-bisection, needs-reduction
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org, slyfox at gcc dot gnu.org,
                    unassigned at gcc dot gnu.org, webrown.cpp at gmail dot=
 com
        Depends on: 96717
            Blocks: 96721
  Target Milestone: ---

+++ This bug was initially created as a clone of Bug #96717 +++

struct S { int s; ~S () {} };

void
foo (S *a)
{
  if (a)
    return;
  a->~S ();
}

int
main ()
{
  S s;
  foo (&s);
}

is miscompiled, since r249450 aka
r8-1519-ge59a1c22fb249388e82b4fd004f33615abe36d2e at -O2.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96717
[Bug 96717] -flifetime-dse=3D2 breaks webkit-gtk-2.28.4
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96721
[Bug 96721] [11 Regression] pseudo-destructor calls on pointers since r11-2=
238=