diff a/src/hotspot/cpu/aarch64/register_aarch64.cpp b/src/hotspot/cpu/aarch64/register_aarch64.cpp
--- a/src/hotspot/cpu/aarch64/register_aarch64.cpp
+++ b/src/hotspot/cpu/aarch64/register_aarch64.cpp
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2014, Red Hat Inc. All rights reserved.
+ * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
@@ -31,10 +31,13 @@
 
 const int ConcreteRegisterImpl::max_fpr
   = ConcreteRegisterImpl::max_gpr +
     FloatRegisterImpl::number_of_registers * FloatRegisterImpl::max_slots_per_register;
 
+const int ConcreteRegisterImpl::max_pr
+  = ConcreteRegisterImpl::max_fpr + PRegisterImpl::number_of_registers;
+
 const char* RegisterImpl::name() const {
   const char* names[number_of_registers] = {
     "c_rarg0", "c_rarg1", "c_rarg2", "c_rarg3", "c_rarg4", "c_rarg5", "c_rarg6", "c_rarg7",
     "rscratch1", "rscratch2",
     "r10", "r11", "r12", "r13", "r14", "r15", "r16",
@@ -52,5 +55,13 @@
     "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",
     "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31"
   };
   return is_valid() ? names[encoding()] : "noreg";
 }
+
+const char* PRegisterImpl::name() const {
+  const char* names[number_of_registers] = {
+    "p0", "p1", "p2", "p3", "p4", "p5", "p6", "p7",
+    "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15"
+  };
+  return is_valid() ? names[encoding()] : "noreg";
+}