v/thirdparty/libatomic_ops/atomic_ops/sysdeps/gcc/generic-small.template

/*
 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
 * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
 * Copyright (c) 2003-2011 Hewlett-Packard Development Company, L.P.
 *
 *
 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
 *
 * Permission is hereby granted to use or copy this program
 * for any purpose, provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 */

#if !defined(AO_GCC_HAVE_XSIZE_SYNC_CAS) || !defined(AO_PREFER_GENERALIZED)

AO_INLINE XCTYPE
AO_XSIZE_load(const volatile XCTYPE *addr)
{
  return __atomic_load_n(addr, __ATOMIC_RELAXED);
}
#define AO_HAVE_XSIZE_load

AO_INLINE XCTYPE
AO_XSIZE_load_acquire(const volatile XCTYPE *addr)
{
  return __atomic_load_n(addr, __ATOMIC_ACQUIRE);
}
#define AO_HAVE_XSIZE_load_acquire

/* XSIZE_load_read is defined using load and nop_read.                  */
/* TODO: Map it to ACQUIRE.  We should be strengthening the read and    */
/* write stuff to the more general acquire/release versions.  It almost */
/* never makes a difference and is much less error-prone.               */

/* XSIZE_load_full is generalized using load and nop_full.              */
/* TODO: Map it to SEQ_CST and clarify the documentation.               */

/* TODO: Map load_dd_acquire_read to ACQUIRE.  Ideally it should be     */
/* mapped to CONSUME, but the latter is currently broken.               */

/* XSIZE_store_full definition is omitted similar to load_full reason.  */

/* TODO: Map store_write to RELEASE.    */

#ifndef AO_SKIPATOMIC_XSIZE_store
  AO_INLINE void
  AO_XSIZE_store(volatile XCTYPE *addr, XCTYPE value)
  {
    __atomic_store_n(addr, value, __ATOMIC_RELAXED);
  }
# define AO_HAVE_XSIZE_store
#endif

#ifndef AO_SKIPATOMIC_XSIZE_store_release
  AO_INLINE void
  AO_XSIZE_store_release(volatile XCTYPE *addr, XCTYPE value)
  {
    __atomic_store_n(addr, value, __ATOMIC_RELEASE);
  }
# define AO_HAVE_XSIZE_store_release
#endif

#endif /* !AO_GCC_HAVE_XSIZE_SYNC_CAS || !AO_PREFER_GENERALIZED */

#ifdef AO_GCC_HAVE_XSIZE_SYNC_CAS

  AO_INLINE XCTYPE
  AO_XSIZE_fetch_compare_and_swap(volatile XCTYPE *addr,
                                  XCTYPE old_val, XCTYPE new_val)
  {
    (void)__atomic_compare_exchange_n(addr,
                                      &old_val /* p_expected */,
                                      new_val /* desired */,
                                      0 /* is_weak: false */,
                                      __ATOMIC_RELAXED /* success */,
                                      __ATOMIC_RELAXED /* failure */);
    return old_val;
  }
# define AO_HAVE_XSIZE_fetch_compare_and_swap

  AO_INLINE XCTYPE
  AO_XSIZE_fetch_compare_and_swap_acquire(volatile XCTYPE *addr,
                                          XCTYPE old_val, XCTYPE new_val)
  {
    (void)__atomic_compare_exchange_n(addr, &old_val, new_val, 0,
                                      __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
    return old_val;
  }
# define AO_HAVE_XSIZE_fetch_compare_and_swap_acquire

  AO_INLINE XCTYPE
  AO_XSIZE_fetch_compare_and_swap_release(volatile XCTYPE *addr,
                                          XCTYPE old_val, XCTYPE new_val)
  {
    (void)__atomic_compare_exchange_n(addr, &old_val, new_val, 0,
                                      __ATOMIC_RELEASE,
                                      __ATOMIC_RELAXED /* failure */);
    return old_val;
  }
# define AO_HAVE_XSIZE_fetch_compare_and_swap_release

  AO_INLINE XCTYPE
  AO_XSIZE_fetch_compare_and_swap_full(volatile XCTYPE *addr,
                                       XCTYPE old_val, XCTYPE new_val)
  {
    (void)__atomic_compare_exchange_n(addr, &old_val, new_val, 0,
                                      __ATOMIC_ACQ_REL,
                                      __ATOMIC_ACQUIRE /* failure */);
    return old_val;
  }
# define AO_HAVE_XSIZE_fetch_compare_and_swap_full

# ifndef AO_GENERALIZE_ASM_BOOL_CAS
    AO_INLINE int
    AO_XSIZE_compare_and_swap(volatile XCTYPE *addr,
                              XCTYPE old_val, XCTYPE new_val)
    {
      return (int)__atomic_compare_exchange_n(addr, &old_val, new_val, 0,
                                        __ATOMIC_RELAXED, __ATOMIC_RELAXED);
    }
#   define AO_HAVE_XSIZE_compare_and_swap

    AO_INLINE int
    AO_XSIZE_compare_and_swap_acquire(volatile XCTYPE *addr,
                                      XCTYPE old_val, XCTYPE new_val)
    {
      return (int)__atomic_compare_exchange_n(addr, &old_val, new_val, 0,
                                        __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
    }
#   define AO_HAVE_XSIZE_compare_and_swap_acquire

    AO_INLINE int
    AO_XSIZE_compare_and_swap_release(volatile XCTYPE *addr,
                                      XCTYPE old_val, XCTYPE new_val)
    {
      return (int)__atomic_compare_exchange_n(addr, &old_val, new_val, 0,
                                              __ATOMIC_RELEASE,
                                              __ATOMIC_RELAXED /* failure */);
    }
#   define AO_HAVE_XSIZE_compare_and_swap_release

    AO_INLINE int
    AO_XSIZE_compare_and_swap_full(volatile XCTYPE *addr,
                                   XCTYPE old_val, XCTYPE new_val)
    {
      return (int)__atomic_compare_exchange_n(addr, &old_val, new_val, 0,
                                              __ATOMIC_ACQ_REL,
                                              __ATOMIC_ACQUIRE /* failure */);
    }
#   define AO_HAVE_XSIZE_compare_and_swap_full

# endif /* !AO_GENERALIZE_ASM_BOOL_CAS */

#endif /* AO_GCC_HAVE_XSIZE_SYNC_CAS */