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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/103006] [9/10/11/12 Regression] wrong code at -O1 or
 -O2 on x86_64-linux-gnu
Date: Sat, 30 Oct 2021 22:15:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103006

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[9/10/11/12 Regression]     |[9/10/11/12 Regression]
                   |wrong code at -O2 (only) on |wrong code at -O1 or -O2 on
                   |x86_64-linux-gnu            |x86_64-linux-gnu
          Component|tree-optimization           |middle-end
      Known to fail|                            |8.1.0
   Target Milestone|---                         |9.5
           Keywords|                            |wrong-code

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Since noipa does not work with GCC 7, the following fails all the back to G=
CC
7:

__attribute__((noipa,noinline,noclone)) void ff(void){asm("":::"memory");}
int a, *b, c, e, f;
__attribute__((always_inline))
static inline void g() {
  int *d[7];
  d[6] =3D b =3D (int *)d;
  ff();
}
__attribute__((noinline))
int i() {
  for (c =3D 0; c < 2; c++) {
    long h[6][2];
    for (e =3D 0; e < 6; e++)
      for (f =3D 0; f < 2; f++)
        h[e][f] =3D 1;
    if (c) {
      g();
      return h[3][0];
    }
  }
  return 0;
}
int main() {
  if (i() !=3D 1)
    __builtin_abort ();
  return 0;
}=