// Protocol Buffers - Google's data interchange format
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// Copyright 2015 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: ogabbay@advaoptical.com (Oded Gabbay)
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// Cleaned up by: bsilver16384@gmail.com (Brian Silverman)
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//
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// This file is an internal atomic implementation, use atomicops.h instead.
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#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
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#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
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#define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
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namespace google {
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namespace protobuf {
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namespace internal {
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inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
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Atomic32 old_value,
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Atomic32 new_value) {
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Atomic32 prev;
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__asm__ __volatile__(
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"0: \n\t"
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"lwarx %[prev],0,%[ptr] \n\t"
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"cmpw 0,%[prev],%[old_value] \n\t"
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"bne- 1f \n\t"
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"stwcx. %[new_value],0,%[ptr] \n\t"
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"bne- 0b \n\t"
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"1: \n\t"
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: [prev] "=&r"(prev), "+m"(*ptr)
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: [ptr] "r"(ptr), [old_value] "r"(old_value), [new_value] "r"(new_value)
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: "cc", "memory");
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return prev;
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}
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inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
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Atomic32 new_value) {
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Atomic32 old;
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__asm__ __volatile__(
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"0: \n\t"
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"lwarx %[old],0,%[ptr] \n\t"
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"stwcx. %[new_value],0,%[ptr] \n\t"
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"bne- 0b \n\t"
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: [old] "=&r"(old), "+m"(*ptr)
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: [ptr] "r"(ptr), [new_value] "r"(new_value)
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: "cc", "memory");
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return old;
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}
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inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
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Atomic32 increment) {
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Atomic32 temp;
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__asm__ __volatile__(
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"0: \n\t"
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"lwarx %[temp],0,%[ptr] \n\t"
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"add %[temp],%[increment],%[temp] \n\t"
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"stwcx. %[temp],0,%[ptr] \n\t"
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"bne- 0b \n\t"
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: [temp] "=&r"(temp)
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: [increment] "r"(increment), [ptr] "r"(ptr)
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: "cc", "memory");
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return temp;
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}
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inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
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Atomic32 increment) {
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MemoryBarrierInternal();
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Atomic32 res = NoBarrier_AtomicIncrement(ptr, increment);
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MemoryBarrierInternal();
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return res;
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}
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inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
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Atomic32 old_value, Atomic32 new_value) {
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Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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MemoryBarrierInternal();
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return res;
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}
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inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
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Atomic32 old_value, Atomic32 new_value) {
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MemoryBarrierInternal();
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Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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return res;
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}
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inline void NoBarrier_Store(volatile Atomic32 *ptr, Atomic32 value) {
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*ptr = value;
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}
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inline void MemoryBarrierInternal() { __asm__ __volatile__("sync" : : : "memory"); }
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inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) {
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*ptr = value;
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MemoryBarrierInternal();
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}
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inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) {
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MemoryBarrierInternal();
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*ptr = value;
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}
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inline Atomic32 NoBarrier_Load(volatile const Atomic32 *ptr) { return *ptr; }
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inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) {
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Atomic32 value = *ptr;
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MemoryBarrierInternal();
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return value;
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}
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inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
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MemoryBarrierInternal();
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return *ptr;
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}
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} // namespace internal
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} // namespace protobuf
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} // namespace google
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#undef ATOMICOPS_COMPILER_BARRIER
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#endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
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