diff -r a7114d3d712e -r b30b3c2a0cf2 src/share/vm/opto/matcher.cpp
--- a/src/share/vm/opto/matcher.cpp	Tue Jan 22 11:31:25 2013 -0800
+++ b/src/share/vm/opto/matcher.cpp	Tue Jan 22 15:34:16 2013 -0800
@@ -919,6 +919,7 @@
     case Op_AryEq:
     case Op_MemBarVolatile:
     case Op_MemBarCPUOrder: // %%% these ideals should have narrower adr_type?
+    case Op_EncodeISOArray:
       nidx = Compile::AliasIdxTop;
       nat = NULL;
       break;
@@ -1982,6 +1983,7 @@
       case Op_StrEquals:
       case Op_StrIndexOf:
       case Op_AryEq:
+      case Op_EncodeISOArray:
         set_shared(n); // Force result into register (it will be anyways)
         break;
       case Op_ConP: {  // Convert pointers above the centerline to NUL
@@ -2183,6 +2185,13 @@
         n->del_req(4);
         break;
       }
+      case Op_EncodeISOArray: {
+        // Restructure into a binary tree for Matching.
+        Node* pair = new (C) BinaryNode(n->in(3), n->in(4));
+        n->set_req(3, pair);
+        n->del_req(4);
+        break;
+      }
       default:
         break;
       }