[Bug tree-optimization/77648] [5/6/7 Regression] Setting conversion to a integer to double to 0 3/4 through a loop

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77648

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
struct S { int *p; int *q; };

int **__attribute__((noinline,noclone,pure)) foo (struct S *s)
{
  return &s->q;
}

int main()
{
  struct S s;
  int i = 1, j = 2;
  int **x;
  s.p = &i;
  s.q = &j;
  x = foo (&s);
  **x = 7;
  if (j != 7)
    __builtin_abort ();
  return 0;
}