[Bug rtl-optimization/82388] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82388

--- Comment #1 from Zhendong Su <su at cs dot ucdavis.edu> ---
This one also seems to be related, but it fails non-deterministically. 

$ gcctk -Os tmp.c; a.out
32767
$ gcctk -Os tmp.c; a.out
0
$ gcctk -Os tmp.c; a.out
32767
$ gcctk -Os tmp.c; a.out
32767
$ gcctk -Os tmp.c; a.out
32767
$


-----------------------------------


int printf (const char *, ...);

struct A
{ 
  int:30;
  int b;
};

struct A fn1 ()
{ 
  struct A e[9][5] = {{{1}}};
  return e[8][0];
}

int main ()
{ 
  struct A f = fn1 ();
  printf ("%d\n", f.b);
  return 0;
}