*** old/src/share/vm/opto/superword.cpp	Thu Oct 29 15:41:02 2009
--- new/src/share/vm/opto/superword.cpp	Thu Oct 29 15:41:02 2009

*** 1919,1928 ****
--- 1919,1933 ----
      assert(!valid(), "too complex");
      return;
    }
    // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant)
    Node* base = adr->in(AddPNode::Base);
+   //unsafe reference could not be aligned appropriately without runtime checking
+   if (base == NULL || base->bottom_type() == Type::TOP) {
+     assert(!valid(), "unsafe access");
+     return;
+   }
    for (int i = 0; i < 3; i++) {
      if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) {
        assert(!valid(), "too complex");
        return;
      }