[Bug tree-optimization/48377] [4.6/4.7 regression] miscompilation at -O3

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48377

--- Comment #42 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-06-03 
10:54:54 UTC ---
It surprises me it doesn't handle it, that is clearly a bug.
Conceptually it is no different from
struct A { char c; unsigned int d; } __attribute__((packed));

unsigned int
id (struct A *p)
{
  return p->d;
}

which is handled.