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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103237] [10/11/12 Regression] wrong code with
 -ftree-vectorize at -O1 on x86_64-linux-gnu since
 r10-1361-g9f962469cabc7fdc
Date: Mon, 15 Nov 2021 09:50:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103237

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Reduced testcase where we vectorize the outer loop

int g1;
unsigned int g2 =3D 4294967295U;
static void __attribute__((noipa)) func_1()
{
  int *l_1 =3D &g1;
  for (int g3a =3D 0; g3a !=3D 2; g3a++)
    for (int l_2 =3D 0; l_2 <=3D 3; l_2++)
      {
        unsigned int *l_3 =3D &g2;
        *l_1 =3D *l_3 ^=3D 1;
      }
}
int main()
{
  func_1();
  if (g1 !=3D -1)
    __builtin_abort ();
  return 0;
}=