src/hotspot/os_cpu/linux_aarch64/atomic_linux_aarch64.hpp

rev 49986 : 8202080: Introduce ordering semantics for Atomic::add and other RMW atomics
Reviewed-by: lucy, rehn, dholmes

*** 1,7 ****
  /*
!  * Copyright (c) 1999, 2017, 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
--- 1,7 ----
  /*
!  * Copyright (c) 1999, 2018, 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
*** 37,55 ****
  template<size_t byte_size>
  struct Atomic::PlatformAdd
    : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
  {
    template<typename I, typename D>
!   D add_and_fetch(I add_value, D volatile* dest) const {
      return __sync_add_and_fetch(dest, add_value);
    }
  };
  
  template<size_t byte_size>
  template<typename T>
  inline T Atomic::PlatformXchg<byte_size>::operator()(T exchange_value,
!                                                      T volatile* dest) const {
    STATIC_ASSERT(byte_size == sizeof(T));
    T res = __sync_lock_test_and_set(dest, exchange_value);
    FULL_MEM_BARRIER;
    return res;
  }
--- 37,56 ----
  template<size_t byte_size>
  struct Atomic::PlatformAdd
    : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
  {
    template<typename I, typename D>
!   D add_and_fetch(I add_value, D volatile* dest, atomic_memory_order order) const {
      return __sync_add_and_fetch(dest, add_value);
    }
  };
  
  template<size_t byte_size>
  template<typename T>
  inline T Atomic::PlatformXchg<byte_size>::operator()(T exchange_value,
!                                                      T volatile* dest,
!                                                      atomic_memory_order order) const {
    STATIC_ASSERT(byte_size == sizeof(T));
    T res = __sync_lock_test_and_set(dest, exchange_value);
    FULL_MEM_BARRIER;
    return res;
  }
*** 57,67 ****
  template<size_t byte_size>
  template<typename T>
  inline T Atomic::PlatformCmpxchg<byte_size>::operator()(T exchange_value,
                                                          T volatile* dest,
                                                          T compare_value,
!                                                         cmpxchg_memory_order order) const {
    STATIC_ASSERT(byte_size == sizeof(T));
    if (order == memory_order_relaxed) {
      T value = compare_value;
      __atomic_compare_exchange(dest, &value, &exchange_value, /*weak*/false,
                                __ATOMIC_RELAXED, __ATOMIC_RELAXED);
--- 58,68 ----
  template<size_t byte_size>
  template<typename T>
  inline T Atomic::PlatformCmpxchg<byte_size>::operator()(T exchange_value,
                                                          T volatile* dest,
                                                          T compare_value,
!                                                         atomic_memory_order order) const {
    STATIC_ASSERT(byte_size == sizeof(T));
    if (order == memory_order_relaxed) {
      T value = compare_value;
      __atomic_compare_exchange(dest, &value, &exchange_value, /*weak*/false,
                                __ATOMIC_RELAXED, __ATOMIC_RELAXED);