--- old/src/share/vm/opto/node.cpp	2016-11-23 13:57:06.147141486 +0100
+++ new/src/share/vm/opto/node.cpp	2016-11-23 13:57:06.079141489 +0100
@@ -1117,8 +1117,8 @@
   if (this->is_Store()) {
     // Condition for back-to-back stores folding.
     return n->Opcode() == op && n->in(MemNode::Memory) == this;
-  } else if (this->is_Load()) {
-    // Condition for removing an unused LoadNode from the MemBarAcquire precedence input
+  } else if (this->is_Load() || this->is_DecodeN()) {
+    // Condition for removing an unused LoadNode or DecodeNNode from the MemBarAcquire precedence input
     return n->Opcode() == Op_MemBarAcquire;
   } else if (op == Op_AddL) {
     // Condition for convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y))