[Bug c/58346] ICE with SIGFPE at -O1 and above on x86_64-linux-gnu (affecting trunk, 4.8, 4.7, and 4.6)

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58346

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I wonder what

struct U {};
static struct U b[6];

int foo (struct U *p, struct U *q)
{
  return q - p;
}
int main()
{
  return foo (&b[0], &b[4]);
}

is expected to do.  It raises a division by zero exception at runtime
(that's definitely a FE bug).  That's either wrong-code or the same
issue (not valid GNU C).