uclibc-ng/libc/sysdeps/linux/kvx/bits/atomic.h

/* Copyright (C) 2003-2017 Free Software Foundation, Inc.
   Copyright (C) 2023 Kalray Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

/* Mostly copied from aarch64 atomic.h */

#ifndef _KVX_BITS_ATOMIC_H
#define _KVX_BITS_ATOMIC_H

#define typeof __typeof__

#include <stdint.h>
#include <sysdep.h>

typedef int8_t atomic8_t;
typedef uint8_t uatomic8_t;
typedef int_fast8_t atomic_fast8_t;
typedef uint_fast8_t uatomic_fast8_t;

typedef int16_t atomic16_t;
typedef uint16_t uatomic16_t;
typedef int_fast16_t atomic_fast16_t;
typedef uint_fast16_t uatomic_fast16_t;

typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;

typedef int64_t atomic64_t;
typedef uint64_t uatomic64_t;
typedef int_fast64_t atomic_fast64_t;
typedef uint_fast64_t uatomic_fast64_t;

typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;


#ifndef atomic_full_barrier
# define atomic_full_barrier() do { atomic_read_barrier();		\
					atomic_write_barrier(); } while(0)
#endif

#ifndef atomic_read_barrier
# define atomic_read_barrier() __builtin_kvx_dinval()
#endif

#ifndef atomic_write_barrier
# define atomic_write_barrier() __builtin_kvx_fence()
#endif

#define __HAVE_64B_ATOMICS 1
#define USE_ATOMIC_COMPILER_BUILTINS 1

/* Compare and exchange.
   For all "bool" routines, we return FALSE if exchange succesful.  */

# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

#  define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				  model, __ATOMIC_RELAXED);		\
  })

# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })

# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })

# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })

#  define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
  ({									\
    typeof (*mem) __oldval = (oldval);					\
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
				 model, __ATOMIC_RELAXED);		\
    __oldval;								\
  })


/* Compare and exchange with "acquire" semantics, ie barrier after.  */

# define atomic_compare_and_exchange_bool_acq(mem, new, old)	\
  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,	\
			mem, new, old, __ATOMIC_ACQUIRE)

# define atomic_compare_and_exchange_val_acq(mem, new, old)	\
  __atomic_val_bysize (__arch_compare_and_exchange_val, int,	\
		       mem, new, old, __ATOMIC_ACQUIRE)

/* Compare and exchange with "release" semantics, ie barrier before.  */

# define atomic_compare_and_exchange_val_rel(mem, new, old)	 \
  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
                       mem, new, old, __ATOMIC_RELEASE)


/* Atomic exchange (without compare).  */

# define __arch_exchange_8_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

# define __arch_exchange_16_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

# define __arch_exchange_32_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

#  define __arch_exchange_64_int(mem, newval, model)	\
  __atomic_exchange_n (mem, newval, model)

# define atomic_exchange_acq(mem, value)				\
  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)

# define atomic_exchange_rel(mem, value)				\
  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)


/* Atomically add value and return the previous (unincremented) value.  */

# define __arch_exchange_and_add_8_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

# define __arch_exchange_and_add_16_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

# define __arch_exchange_and_add_32_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

#  define __arch_exchange_and_add_64_int(mem, value, model)	\
  __atomic_fetch_add (mem, value, model)

# define atomic_exchange_and_add_acq(mem, value)			\
  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\
		       __ATOMIC_ACQUIRE)

# define atomic_exchange_and_add_rel(mem, value)			\
  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\

#endif