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9773c3dd6d
except for CompareAndSwap. That is the only one still being used anywhere now that statistics have been moved onto std::atomic. Also, add a warning to the header that we shouldn't introduce more uses of these old style atomics and instead should be using C++11's std::atomic facilities. Really hoping that we can hammer out the last couple of users here and replace them with something more localized and/or principled, but figured this was a pretty good start. =] Note that this patch will need to be reverted if r271504 needs to be reverted as that removes the last user of these. However, the biggest risk for that patch was MSVC 2013 and at least one bot has already passed where it would have failed there. I've tested MSVC 2015 using their web interfaces and other platforms seem fine, so I'm optimistic. Differential Revision: http://reviews.llvm.org/D20901 llvm-svn: 271540
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
//===-- Atomic.cpp - Atomic Operations --------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements atomic operations.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Atomic.h"
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#include "llvm/Config/llvm-config.h"
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using namespace llvm;
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#if defined(_MSC_VER)
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#include <Intrin.h>
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#include <windows.h>
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#undef MemoryFence
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#endif
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#if defined(__GNUC__) || (defined(__IBMCPP__) && __IBMCPP__ >= 1210)
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#define GNU_ATOMICS
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#endif
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void sys::MemoryFence() {
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#if LLVM_HAS_ATOMICS == 0
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return;
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#else
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# if defined(GNU_ATOMICS)
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__sync_synchronize();
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# elif defined(_MSC_VER)
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MemoryBarrier();
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# else
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# error No memory fence implementation for your platform!
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# endif
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#endif
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}
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sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
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sys::cas_flag new_value,
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sys::cas_flag old_value) {
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#if LLVM_HAS_ATOMICS == 0
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sys::cas_flag result = *ptr;
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if (result == old_value)
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*ptr = new_value;
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return result;
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#elif defined(GNU_ATOMICS)
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return __sync_val_compare_and_swap(ptr, old_value, new_value);
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#elif defined(_MSC_VER)
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return InterlockedCompareExchange(ptr, new_value, old_value);
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#else
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# error No compare-and-swap implementation for your platform!
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#endif
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}
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