*** old/src/share/vm/opto/loopTransform.cpp	Thu Jun  4 16:40:48 2015
--- new/src/share/vm/opto/loopTransform.cpp	Thu Jun  4 16:40:46 2015

*** 1912,1922 ****
--- 1912,1925 ----
    assert(opqzm->in(1) == main_limit, "do not understand situation");
  
    // Find the pre-loop limit; we will expand it's iterations to
    // not ever trip low tests.
    Node *p_f = iffm->in(0);
    assert(p_f->Opcode() == Op_IfFalse, "");
+   // pre loop may have been optimized out
+   if (p_f->Opcode() != Op_IfFalse) {
+     return;
+   }
    CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd();
    assert(pre_end->loopnode()->is_pre_loop(), "");
    Node *pre_opaq1 = pre_end->limit();
    // Occasionally it's possible for a pre-loop Opaque1 node to be
    // optimized away and then another round of loop opts attempted.