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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/115492] [15 Regression] wrong code at -O2/O3
Date: Fri, 14 Jun 2024 23:59:35 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 15.0
X-Bugzilla-Keywords: needs-bisection, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115492

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2024-06-14
            Summary|[15 Regression] wrong code  |[15 Regression] wrong code
                   |at -O2/O3 when compiled     |at -O2/O3
                   |with -fPIC                  |
           Keywords|                            |needs-bisection
     Ever confirmed|0                           |1
   Target Milestone|---                         |15.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. -fPIC is just forces f to not to be inlined.
Here is a testcase which fails at -O2 but passes at -O0/-O1:
```
int a =3D 2, b=3D0, *c =3D &a, *d =3D &a, e=3D0;
[[gnu::noipa]]
void f(int) {}
[[gnu::noinline]]
int h(int *k) {
  int ***j;
  if (b) {
    *j =3D &k; // Note the unintialized j is used here
             // but since it is conditional and b is always zero, there sho=
uld
no
             // effect otherwise.
    ***j;
  }
  f(*k);
  *d =3D e;
  return *k;
}
int main() { if (h(c)) __builtin_abort(); }
```=