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2d04b8491b
Update the instances of checks for architectures to be more broad for different spellings of the architecture macro. Certain targets use `_M_ARM` and others use `__arm__`. Similarly, arm64/aarch64 has `_M_ARM64`, `__arm64__` and `__aarch64__` as spellings. This just mechanically goes through and encodes the various spellings. Take the opportunity to replace some raw checks with `defined` checks which avoids a pedantic warning due to the undefined macro when performing the check as the preprocessor may warn about an undefined condition evaluating to `0`.
32 lines
1.3 KiB
C++
32 lines
1.3 KiB
C++
//===--- Atomic.h - Utilities for atomic operations. ------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Utilities for atomic operations, to use with std::atomic.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_ATOMIC_H
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#define SWIFT_RUNTIME_ATOMIC_H
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// FIXME: Workaround for rdar://problem/18889711. 'Consume' does not require
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// a barrier on ARM64, but LLVM doesn't know that. Although 'relaxed'
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// is formally UB by C++11 language rules, we should be OK because neither
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// the processor model nor the optimizer can realistically reorder our uses
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// of 'consume'.
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#if defined(__arm__) || defined(_M_ARM) || defined(__arm64__) || defined(__aarch64__) || defined(_M_ARM64)
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# define SWIFT_MEMORY_ORDER_CONSUME (std::memory_order_relaxed)
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#else
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# define SWIFT_MEMORY_ORDER_CONSUME (std::memory_order_consume)
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#endif
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#endif
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