/*

 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. 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.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 *

 */

#ifndef OS_CPU_SOLARIS_SPARC_ATOMIC_SOLARIS_SPARC_HPP

#define OS_CPU_SOLARIS_SPARC_ATOMIC_SOLARIS_SPARC_HPP

// Implementation of class atomic

// Implement ADD using a CAS loop.

template<size_t byte_size>

struct Atomic::PlatformAdd {

  template<typename D, typename I>

  inline D operator()(D volatile* dest, I add_value, atomic_memory_order order) const {

    D old_value = *dest;

    while (true) {

      D new_value = old_value + add_value;

      D result = cmpxchg(new_value, dest, old_value);

      if (result == old_value) break;

      old_value = result;

    }

    return old_value + add_value;

  }

};

template<>

template<typename T>

                                             atomic_memory_order order) const {

  STATIC_ASSERT(4 == sizeof(T));

  __asm__ volatile (  "swap [%2],%0"

                    : "=r" (exchange_value)

                    : "0" (exchange_value), "r" (dest)

                    : "memory");

  return exchange_value;

}

template<>

template<typename T>

                                             atomic_memory_order order) const {

  STATIC_ASSERT(8 == sizeof(T));

  T old_value = *dest;

  while (true) {

    T result = cmpxchg(exchange_value, dest, old_value);

    if (result == old_value) break;

    old_value = result;

  }

  return old_value;

}

// No direct support for cmpxchg of bytes; emulate using int.

template<>

struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {};

template<>

template<typename T>

inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,

                                                T volatile* dest,

                                                T compare_value,

                                                atomic_memory_order order) const {

  STATIC_ASSERT(4 == sizeof(T));

  T rv;

  __asm__ volatile(

    " cas    [%2], %3, %0"

    : "=r" (rv)

    : "0" (exchange_value), "r" (dest), "r" (compare_value)

    : "memory");

  return rv;

}

template<>

template<typename T>

inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,

                                                T volatile* dest,

                                                T compare_value,

                                                atomic_memory_order order) const {

  STATIC_ASSERT(8 == sizeof(T));

  T rv;

  __asm__ volatile(

    " casx   [%2], %3, %0"

    : "=r" (rv)

    : "0" (exchange_value), "r" (dest), "r" (compare_value)

    : "memory");

  return rv;

}

#endif // OS_CPU_SOLARIS_SPARC_ATOMIC_SOLARIS_SPARC_HPP