src/share/vm/opto/loopUnswitch.cpp

*** 59,68 ****
--- 59,74 ----
      return false;
    }
    if (!_head->is_Loop()) {
      return false;
    }
+ 
+   // check for vectorized loops, any unswitching was already applied
+   if (_head->is_CountedLoop() && _head->as_CountedLoop()->ignore_slp()) {
+     return false;
+   }
+ 
    int nodes_left = phase->C->max_node_limit() - phase->C->live_nodes();
    if ((int)(2 * _body.size()) > nodes_left) {
      return false; // Too speculative if running low on nodes.
    }
    LoopNode* head = _head->as_Loop();