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| 1 // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // This file is an internal atomic implementation, use atomicops.h instead. |
| 6 // |
| 7 |
| 8 #ifndef V8_BASE_ATOMICOPS_INTERNALS_PPC_H_ |
| 9 #define V8_BASE_ATOMICOPS_INTERNALS_PPC_H_ |
| 10 |
| 11 namespace v8 { |
| 12 namespace base { |
| 13 |
| 14 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
| 15 Atomic32 old_value, |
| 16 Atomic32 new_value) { |
| 17 return (__sync_val_compare_and_swap(ptr, old_value, new_value)); |
| 18 } |
| 19 |
| 20 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, |
| 21 Atomic32 new_value) { |
| 22 Atomic32 old_value; |
| 23 do { |
| 24 old_value = *ptr; |
| 25 } while (__sync_bool_compare_and_swap(ptr, old_value, new_value) == false); |
| 26 return old_value; |
| 27 } |
| 28 |
| 29 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, |
| 30 Atomic32 increment) { |
| 31 return Barrier_AtomicIncrement(ptr, increment); |
| 32 } |
| 33 |
| 34 inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, |
| 35 Atomic32 increment) { |
| 36 for (;;) { |
| 37 Atomic32 old_value = *ptr; |
| 38 Atomic32 new_value = old_value + increment; |
| 39 if (__sync_bool_compare_and_swap(ptr, old_value, new_value)) { |
| 40 return new_value; |
| 41 // The exchange took place as expected. |
| 42 } |
| 43 // Otherwise, *ptr changed mid-loop and we need to retry. |
| 44 } |
| 45 } |
| 46 |
| 47 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, |
| 48 Atomic32 old_value, Atomic32 new_value) { |
| 49 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
| 50 } |
| 51 |
| 52 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, |
| 53 Atomic32 old_value, Atomic32 new_value) { |
| 54 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
| 55 } |
| 56 |
| 57 inline void NoBarrier_Store(volatile Atomic8* ptr, Atomic8 value) { |
| 58 *ptr = value; |
| 59 } |
| 60 |
| 61 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { |
| 62 *ptr = value; |
| 63 } |
| 64 |
| 65 inline void MemoryBarrier() { __asm__ __volatile__("sync" : : : "memory"); } |
| 66 |
| 67 inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) { |
| 68 *ptr = value; |
| 69 MemoryBarrier(); |
| 70 } |
| 71 |
| 72 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { |
| 73 MemoryBarrier(); |
| 74 *ptr = value; |
| 75 } |
| 76 |
| 77 inline Atomic8 NoBarrier_Load(volatile const Atomic8* ptr) { return *ptr; } |
| 78 |
| 79 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { return *ptr; } |
| 80 |
| 81 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { |
| 82 Atomic32 value = *ptr; |
| 83 MemoryBarrier(); |
| 84 return value; |
| 85 } |
| 86 |
| 87 inline Atomic32 Release_Load(volatile const Atomic32* ptr) { |
| 88 MemoryBarrier(); |
| 89 return *ptr; |
| 90 } |
| 91 |
| 92 #ifdef V8_TARGET_ARCH_PPC64 |
| 93 inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr, |
| 94 Atomic64 old_value, |
| 95 Atomic64 new_value) { |
| 96 return (__sync_val_compare_and_swap(ptr, old_value, new_value)); |
| 97 } |
| 98 |
| 99 inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, |
| 100 Atomic64 new_value) { |
| 101 Atomic64 old_value; |
| 102 do { |
| 103 old_value = *ptr; |
| 104 } while (__sync_bool_compare_and_swap(ptr, old_value, new_value) == false); |
| 105 return old_value; |
| 106 } |
| 107 |
| 108 inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, |
| 109 Atomic64 increment) { |
| 110 return Barrier_AtomicIncrement(ptr, increment); |
| 111 } |
| 112 |
| 113 inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, |
| 114 Atomic64 increment) { |
| 115 for (;;) { |
| 116 Atomic64 old_value = *ptr; |
| 117 Atomic64 new_value = old_value + increment; |
| 118 if (__sync_bool_compare_and_swap(ptr, old_value, new_value)) { |
| 119 return new_value; |
| 120 // The exchange took place as expected. |
| 121 } |
| 122 // Otherwise, *ptr changed mid-loop and we need to retry. |
| 123 } |
| 124 } |
| 125 |
| 126 inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr, |
| 127 Atomic64 old_value, Atomic64 new_value) { |
| 128 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
| 129 } |
| 130 |
| 131 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr, |
| 132 Atomic64 old_value, Atomic64 new_value) { |
| 133 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
| 134 } |
| 135 |
| 136 inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) { |
| 137 *ptr = value; |
| 138 } |
| 139 |
| 140 inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) { |
| 141 *ptr = value; |
| 142 MemoryBarrier(); |
| 143 } |
| 144 |
| 145 inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) { |
| 146 MemoryBarrier(); |
| 147 *ptr = value; |
| 148 } |
| 149 |
| 150 inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) { return *ptr; } |
| 151 |
| 152 inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) { |
| 153 Atomic64 value = *ptr; |
| 154 MemoryBarrier(); |
| 155 return value; |
| 156 } |
| 157 |
| 158 inline Atomic64 Release_Load(volatile const Atomic64* ptr) { |
| 159 MemoryBarrier(); |
| 160 return *ptr; |
| 161 } |
| 162 |
| 163 #endif |
| 164 } |
| 165 } // namespace v8::base |
| 166 |
| 167 #endif // V8_BASE_ATOMICOPS_INTERNALS_PPC_GCC_H_ |
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