[Bug tree-optimization/121362] SCCVN (FRE) sometimes does not read through aggregate copies

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121362

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Related:

struct s1
{
  int t, t1;
};

struct s3
{
  struct s1 t;
};

struct s2
{
  struct s3 t;
};

void f(int, int);
void l();
void g(int a, int b, int *p)
{
  struct s2 c;
  {
    struct s1 tmp = {a,b};
    c.t.t = tmp;
  }
  struct s1 *t = &c.t.t;
  f(t->t, t->t1);
}


with

{component_ref<t>,component_ref<t>,mem_ref<0B>,addr_expr<&c>}

vs

{component_ref<t1>,mem_ref<0B>,addr_expr<&c>}