[Bug tree-optimization/49444] IV-OPTs changes an unaligned loads into aligned loads incorrectly

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49444

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-16 
20:08:43 UTC ---
Well, I'm 100% sure this is just the age-old bug that GCC can't expand
misaligned indirect-refs (or nowadays mem-refs and target-mem-refs) on
strict-align targets properly.

Try the following on any GCC version:

typedef int myint __attribute__((aligned(1)));

int foo(myint *p)
{
  return *p;
}
int main()
{
  char c[5] = {};
  return foo(&c[1]);
}

it'll fault on any strict-align target since forever.  Now it would
indeed be nice if _finally_ somebody would go and fix that ...

Dup of ....