diff a/src/hotspot/cpu/aarch64/register_definitions_aarch64.cpp b/src/hotspot/cpu/aarch64/register_definitions_aarch64.cpp
--- a/src/hotspot/cpu/aarch64/register_definitions_aarch64.cpp
+++ b/src/hotspot/cpu/aarch64/register_definitions_aarch64.cpp
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, 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
@@ -202,5 +202,7 @@
 REGISTER_DEFINITION(PRegister, p11);
 REGISTER_DEFINITION(PRegister, p12);
 REGISTER_DEFINITION(PRegister, p13);
 REGISTER_DEFINITION(PRegister, p14);
 REGISTER_DEFINITION(PRegister, p15);
+
+REGISTER_DEFINITION(PRegister, ptrue);