src/hotspot/share/opto/block.cpp

@@ -175,11 +175,11 @@
    }
  
    // Ideal nodes are allowable in empty blocks: skip them  Only MachNodes
    // turn directly into code, because only MachNodes have non-trivial
    // emit() functions.
-   while ((end_idx > 0) && !get_node(end_idx)->is_Mach()) {
+   while ((end_idx > 0) && !(get_node(end_idx)->is_Mach() || get_node(end_idx)->is_BoxLock())) {
      end_idx--;
    }
  
    // No room for any interesting instructions?
    if (end_idx == 0) {