sysdeps/ia64/atomic-machine.h

   1 /* Copyright (C) 2003-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdint.h>
  19 #include <ia64intrin.h>
  20
  21 typedef int8_t atomic8_t;
  22 typedef uint8_t uatomic8_t;
  23 typedef int_fast8_t atomic_fast8_t;
  24 typedef uint_fast8_t uatomic_fast8_t;
  25
  26 typedef int16_t atomic16_t;
  27 typedef uint16_t uatomic16_t;
  28 typedef int_fast16_t atomic_fast16_t;
  29 typedef uint_fast16_t uatomic_fast16_t;
  30
  31 typedef int32_t atomic32_t;
  32 typedef uint32_t uatomic32_t;
  33 typedef int_fast32_t atomic_fast32_t;
  34 typedef uint_fast32_t uatomic_fast32_t;
  35
  36 typedef int64_t atomic64_t;
  37 typedef uint64_t uatomic64_t;
  38 typedef int_fast64_t atomic_fast64_t;
  39 typedef uint_fast64_t uatomic_fast64_t;
  40
  41 typedef intptr_t atomicptr_t;
  42 typedef uintptr_t uatomicptr_t;
  43 typedef intmax_t atomic_max_t;
  44 typedef uintmax_t uatomic_max_t;
  45
  46 #define __HAVE_64B_ATOMICS 1
  47 #define USE_ATOMIC_COMPILER_BUILTINS 0
  48
  49 /* XXX Is this actually correct?  */
  50 #define ATOMIC_EXCHANGE_USES_CAS 0
  51
  52
  53 #define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
  54   (abort (), 0)
  55
  56 #define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
  57   (abort (), 0)
  58
  59 #define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
  60   (!__sync_bool_compare_and_swap ((mem), (int) (long) (oldval), \
  61                                   (int) (long) (newval)))
  62
  63 #define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
  64   (!__sync_bool_compare_and_swap ((mem), (long) (oldval), \
  65                                   (long) (newval)))
  66
  67 #define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
  68   (abort (), (__typeof (*mem)) 0)
  69
  70 #define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
  71   (abort (), (__typeof (*mem)) 0)
  72
  73 #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
  74   __sync_val_compare_and_swap ((mem), (int) (long) (oldval), \
  75                                (int) (long) (newval))
  76
  77 #define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
  78   __sync_val_compare_and_swap ((mem), (long) (oldval), (long) (newval))
  79
  80 /* Atomically store newval and return the old value.  */
  81 #define atomic_exchange_acq(mem, value) \
  82   __sync_lock_test_and_set (mem, value)
  83
  84 #define atomic_exchange_rel(mem, value) \
  85   (__sync_synchronize (), __sync_lock_test_and_set (mem, value))
  86
  87 #define atomic_exchange_and_add(mem, value) \
  88   __sync_fetch_and_add ((mem), (value))
  89
  90 #define atomic_decrement_if_positive(mem) \
  91   ({ __typeof (*mem) __oldval, __val;                                         \
  92      __typeof (mem) __memp = (mem);                                           \
  93                                                                               \
  94      __val = (*__memp);                                                       \
  95      do                                                                       \
  96        {                                                                      \
  97          __oldval = __val;                                                    \
  98          if (__builtin_expect (__val <= 0, 0))                                \
  99            break;                                                             \
 100          __val = atomic_compare_and_exchange_val_acq (__memp,   __oldval - 1, \
 101                                                       __oldval);              \
 102        }                                                                      \
 103      while (__builtin_expect (__val != __oldval, 0));                         \
 104      __oldval; })
 105
 106 #define atomic_bit_test_set(mem, bit) \
 107   ({ __typeof (*mem) __oldval, __val;                                         \
 108      __typeof (mem) __memp = (mem);                                           \
 109      __typeof (*mem) __mask = ((__typeof (*mem)) 1 << (bit));                 \
 110                                                                               \
 111      __val = (*__memp);                                                       \
 112      do                                                                       \
 113        {                                                                      \
 114          __oldval = __val;                                                    \
 115          __val = atomic_compare_and_exchange_val_acq (__memp,                 \
 116                                                       __oldval | __mask,      \
 117                                                       __oldval);              \
 118        }                                                                      \
 119      while (__builtin_expect (__val != __oldval, 0));                         \
 120      __oldval & __mask; })
 121
 122 #define atomic_full_barrier() __sync_synchronize ()