[Bug tree-optimization/103237] [10/11/12 Regression] wrong code with -ftree-vectorize at -O1 on x86_64-linux-gnu since r10-1361-g9f962469cabc7fdc

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103237

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

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