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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file is an internal atomic implementation, use atomicops.h instead.
//
#ifndef V8_BASE_ATOMICOPS_INTERNALS_PPC_H_
#define V8_BASE_ATOMICOPS_INTERNALS_PPC_H_
namespace v8 {
namespace base {
inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
Atomic32 old_value,
Atomic32 new_value) {
return (__sync_val_compare_and_swap(ptr, old_value, new_value));
}
inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
Atomic32 new_value) {
Atomic32 old_value;
do {
old_value = *ptr;
} while (__sync_bool_compare_and_swap(ptr, old_value, new_value) == false);
return old_value;
}
inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
Atomic32 increment) {
return Barrier_AtomicIncrement(ptr, increment);
}
inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
Atomic32 increment) {
for (;;) {
Atomic32 old_value = *ptr;
Atomic32 new_value = old_value + increment;
if (__sync_bool_compare_and_swap(ptr, old_value, new_value)) {
return new_value;
// The exchange took place as expected.
}
// Otherwise, *ptr changed mid-loop and we need to retry.
}
}
inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
Atomic32 old_value, Atomic32 new_value) {
return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}
inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
Atomic32 old_value, Atomic32 new_value) {
return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}
inline void NoBarrier_Store(volatile Atomic8* ptr, Atomic8 value) {
*ptr = value;
}
inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
*ptr = value;
}
inline void MemoryBarrier() {
__asm__ __volatile__("sync" : : : "memory"); }
inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
*ptr = value;
MemoryBarrier();
}
inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
MemoryBarrier();
*ptr = value;
}
inline Atomic8 NoBarrier_Load(volatile const Atomic8* ptr) { return *ptr; }
inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { return *ptr; }
inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
Atomic32 value = *ptr;
MemoryBarrier();
return value;
}
inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
MemoryBarrier();
return *ptr;
}
#ifdef V8_TARGET_ARCH_PPC64
inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
Atomic64 old_value,
Atomic64 new_value) {
return (__sync_val_compare_and_swap(ptr, old_value, new_value));
}
inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
Atomic64 new_value) {
Atomic64 old_value;
do {
old_value = *ptr;
} while (__sync_bool_compare_and_swap(ptr, old_value, new_value) == false);
return old_value;
}
inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
Atomic64 increment) {
return Barrier_AtomicIncrement(ptr, increment);
}
inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
Atomic64 increment) {
for (;;) {
Atomic64 old_value = *ptr;
Atomic64 new_value = old_value + increment;
if (__sync_bool_compare_and_swap(ptr, old_value, new_value)) {
return new_value;
// The exchange took place as expected.
}
// Otherwise, *ptr changed mid-loop and we need to retry.
}
}
inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
Atomic64 old_value, Atomic64 new_value) {
return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}
inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
Atomic64 old_value, Atomic64 new_value) {
return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}
inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
*ptr = value;
}
inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
*ptr = value;
MemoryBarrier();
}
inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
MemoryBarrier();
*ptr = value;
}
inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) { return *ptr; }
inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
Atomic64 value = *ptr;
MemoryBarrier();
return value;
}
inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
MemoryBarrier();
return *ptr;
}
#endif
}
} // namespace v8::base
#endif // V8_BASE_ATOMICOPS_INTERNALS_PPC_GCC_H_
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