diff a/src/hotspot/cpu/aarch64/vmreg_aarch64.inline.hpp b/src/hotspot/cpu/aarch64/vmreg_aarch64.inline.hpp
--- a/src/hotspot/cpu/aarch64/vmreg_aarch64.inline.hpp
+++ b/src/hotspot/cpu/aarch64/vmreg_aarch64.inline.hpp
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2006, 2019, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2014, Red Hat Inc. All rights reserved.
+ * Copyright (c) 2006, 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.
@@ -34,6 +34,10 @@
 inline VMReg FloatRegisterImpl::as_VMReg() {
   return VMRegImpl::as_VMReg((encoding() * FloatRegisterImpl::max_slots_per_register) +
                              ConcreteRegisterImpl::max_gpr);
 }
 
+inline VMReg PRegisterImpl::as_VMReg() {
+  return VMRegImpl::as_VMReg(encoding() + ConcreteRegisterImpl::max_fpr);
+}
+
 #endif // CPU_AARCH64_VMREG_AARCH64_INLINE_HPP