--- old/src/hotspot/share/opto/node.cpp	2018-10-17 19:53:13.810601434 +0200
+++ new/src/hotspot/share/opto/node.cpp	2018-10-17 19:53:13.647602485 +0200
@@ -2456,3 +2456,10 @@
 uint TypeNode::ideal_reg() const {
   return _type->ideal_reg();
 }
+
+bool Node::eqv_uncast(const Node* n) const {
+  BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
+  Node* obj1 = bs->step_over_gc_barrier(const_cast<Node*>(this));
+  Node* obj2 = bs->step_over_gc_barrier(const_cast<Node*>(n));
+  return (obj1->uncast() == obj2->uncast());
+}
--- old/src/hotspot/share/opto/node.hpp	2018-10-17 19:53:14.420597504 +0200
+++ new/src/hotspot/share/opto/node.hpp	2018-10-17 19:53:14.259598542 +0200
@@ -457,10 +457,9 @@
 
   // Strip away casting.  (It is depth-limited.)
   Node* uncast() const;
-  // Return whether two Nodes are equivalent, after stripping casting.
-  bool eqv_uncast(const Node* n) const {
-    return (this->uncast() == n->uncast());
-  }
+  // Return whether two Nodes are equivalent, after stripping casting
+  // and GC barriers.
+  bool eqv_uncast(const Node* n) const;
 
   // Find out of current node that matches opcode.
   Node* find_out_with(int opcode);