--- old/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp	2020-08-17 12:17:07.256513033 -0500
+++ new/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp	2020-08-17 12:17:07.136520256 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2019, Red Hat, Inc. All rights reserved.
+ * Copyright (c) 2015, 2020, Red Hat, Inc. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -456,6 +456,9 @@
         "encodeBlock",
         { { TypeFunc::Parms, ShenandoahLoad },  { TypeFunc::Parms+3, ShenandoahStore },   { -1, ShenandoahNone },
           { -1,  ShenandoahNone},                 { -1,  ShenandoahNone},                 { -1,  ShenandoahNone} },
+        "decodeBlock",
+        { { TypeFunc::Parms, ShenandoahLoad },  { TypeFunc::Parms+3, ShenandoahStore },   { -1, ShenandoahNone },
+          { -1,  ShenandoahNone},                 { -1,  ShenandoahNone},                 { -1,  ShenandoahNone} },
       };
 
       if (call->is_call_to_arraycopystub()) {