[Bug tree-optimization/55155] Autovectorization does not use unaligned loads/stores

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55155

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-10-31 21:44:20 UTC ---
  <bb 2>:
  _19 = num_prods_6(D) * 16;
  if (_19 != 0)
    goto <bb 4>;
  else
    goto <bb 3>;

  <bb 3>:
  return;

  <bb 4>:
  _16 = ASSERT_EXPR <_19, _19 != 0>;
...
  if (_16 <= 4)
    goto <bb 5>;
  else
    goto <bb 21>;

We should have an assert_expr that _16 is also greater or equal to than 16.

Note this is changing unsigned to __SIZE_TYPE__ so casting does not get in the
way.