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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/107172] [13 Regression] wrong code with "-O1
 -ftree-vrp" on x86_64-linux-gnu
Date: Thu, 06 Oct 2022 18:02:55 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107172

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|wrong code with "-O1        |[13 Regression] wrong code
                   |-ftree-vrp" on              |with "-O1 -ftree-vrp" on
                   |x86_64-linux-gnu            |x86_64-linux-gnu
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-10-06
     Ever confirmed|0                           |1
   Target Milestone|---                         |13.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. Reduced a little bit more:
```
int a, c, d;
int main() {
  long e =3D 1;
  int f =3D a =3D 1;
 L1:
  if (a)
    a =3D 2;
  int h =3D e =3D ~e;
  c =3D -1;
  if (e >=3D a)
    goto L2;
  if (-1 > a)
    goto L1;
  if (a)
    f =3D -1;
 L2:
  d =3D (-f + d) & h;
  if (d)
    __builtin_abort();
  return 0;
}
```
Note the store for c is important there. I suspect otherwise the load to e =
is
figured out and does the correct thing.=