src/share/vm/opto/superword.cpp

*** 3072,3096 ****
  }
  
  //----------------------------get_pre_loop_end---------------------------
  // Find pre loop end from main loop.  Returns null if none.
  CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode* cl) {
!   Node* ctrl = cl->in(LoopNode::EntryControl);
!   if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL;
!   Node* iffm = ctrl->in(0);
!   if (!iffm->is_If()) return NULL;
!   Node* bolzm = iffm->in(1);
!   if (!bolzm->is_Bool()) return NULL;
!   Node* cmpzm = bolzm->in(1);
!   if (!cmpzm->is_Cmp()) return NULL;
!   Node* opqzm = cmpzm->in(2);
!   // Can not optimize a loop if zero-trip Opaque1 node is optimized
!   // away and then another round of loop opts attempted.
!   if (opqzm->Opcode() != Op_Opaque1) {
      return NULL;
    }
!   Node* p_f = iffm->in(0);
    if (!p_f->is_IfFalse()) return NULL;
    if (!p_f->in(0)->is_CountedLoopEnd()) return NULL;
    CountedLoopEndNode* pre_end = p_f->in(0)->as_CountedLoopEnd();
    CountedLoopNode* loop_node = pre_end->loopnode();
    if (loop_node == NULL || !loop_node->is_pre_loop()) return NULL;
--- 3072,3088 ----
  }
  
  //----------------------------get_pre_loop_end---------------------------
  // Find pre loop end from main loop.  Returns null if none.
  CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode* cl) {
!   // The loop cannot be optimized if the graph shape at
!   // the loop entry is inappropriate.
!   if (!_phase->is_canonical_main_loop_entry(cl)) {
      return NULL;
    }
! 
!   Node* p_f = cl->in(LoopNode::EntryControl)->in(0)->in(0);
    if (!p_f->is_IfFalse()) return NULL;
    if (!p_f->in(0)->is_CountedLoopEnd()) return NULL;
    CountedLoopEndNode* pre_end = p_f->in(0)->as_CountedLoopEnd();
    CountedLoopNode* loop_node = pre_end->loopnode();
    if (loop_node == NULL || !loop_node->is_pre_loop()) return NULL;