[Bug tree-optimization/107212] [11/12/13 Regression] Wrong vectorizer code since r11-718-gc735929a2503a7d0

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107212

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Hmm, have a test-case that is miscompiled since r10-4200-gb7ff7cef5005721e:

$ cat pr107212.c
int sum_1 = 0;

int main() {
  unsigned int tab[6][2] = {{150, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}};

  int sum_0 = 0;

  for (int t = 0; t < 6; t++) {
    sum_0 += tab[t][0];
    sum_1 += tab[t][0];
  }

  if (sum_0 < 100 || sum_0 > 200)
    __builtin_abort();
  return 0;
}

$ gcc pr107212.c -O3 -std=c99 && ./a.out
Aborted (core dumped)