[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

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |needs-bisection
      Known to work|9.1.0, 9.4.0                |
   Target Milestone|10.4                        |9.5
      Known to fail|                            |7.5.0, 9.4.1

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
And the following fails with GCC 9 and 7 as well (using SSE vectorization).

int g1;
unsigned int g2 = 4294967295U;
static void __attribute__((noipa)) func_1()
{
  int *l_1 = &g1;
  for (int g3a = 0; g3a != 4; 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;
}