Squashed 'third_party/boostorg/atomic/' content from commit 19eecf8
Change-Id: I4723a39ab79969b4c0d7b7e67a4143c4e02992ed
git-subtree-dir: third_party/boostorg/atomic
git-subtree-split: 19eecf893c665410de63ab6ebb8549f405703e80
diff --git a/include/boost/atomic/detail/platform.hpp b/include/boost/atomic/detail/platform.hpp
new file mode 100644
index 0000000..df4cc30
--- /dev/null
+++ b/include/boost/atomic/detail/platform.hpp
@@ -0,0 +1,163 @@
+/*
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Copyright (c) 2009 Helge Bahmann
+ * Copyright (c) 2014 Andrey Semashev
+ */
+/*!
+ * \file atomic/detail/platform.hpp
+ *
+ * This header defines macros for the target platform detection
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_PLATFORM_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_PLATFORM_HPP_INCLUDED_
+
+#include <boost/atomic/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#if defined(__GNUC__) && defined(__arm__)
+
+// Newer gcc versions define __ARM_ARCH. Older ones don't, so we have to deduce ARM arch version from a bunch of version-specific macros.
+#if defined(__ARM_ARCH)
+#define BOOST_ATOMIC_DETAIL_ARM_ARCH __ARM_ARCH
+#elif defined(__ARM_ARCH_8A__)
+#define BOOST_ATOMIC_DETAIL_ARM_ARCH 8
+#elif defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) ||\
+ defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) ||\
+ defined(__ARM_ARCH_7EM__) || defined(__ARM_ARCH_7S__)
+#define BOOST_ATOMIC_DETAIL_ARM_ARCH 7
+#elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) ||\
+ defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) ||\
+ defined(__ARM_ARCH_6ZK__)
+#define BOOST_ATOMIC_DETAIL_ARM_ARCH 6
+#else
+// We are not interested in older versions - they don't support atomic ops
+#define BOOST_ATOMIC_DETAIL_ARM_ARCH 0
+#endif
+
+#endif // defined(__GNUC__) && defined(__arm__)
+
+#if !defined(BOOST_ATOMIC_FORCE_FALLBACK)
+
+// Determine the target platform.
+// The target platform describes the compiler and target architecture. It can be used by more generic backends, such as the ones
+// based on compiler intrinsics, to implement specialized operations in a non-generic way.
+
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+
+#define BOOST_ATOMIC_DETAIL_PLATFORM gcc_x86
+#define BOOST_ATOMIC_DETAIL_EXTRA_BACKEND gcc_x86
+
+#elif defined(__GNUC__) && (defined(__POWERPC__) || defined(__PPC__))
+
+#define BOOST_ATOMIC_DETAIL_PLATFORM gcc_ppc
+#define BOOST_ATOMIC_DETAIL_EXTRA_BACKEND gcc_ppc
+
+#elif defined(__GNUC__) && defined(__arm__) && (BOOST_ATOMIC_DETAIL_ARM_ARCH+0) >= 6
+
+#define BOOST_ATOMIC_DETAIL_PLATFORM gcc_arm
+#define BOOST_ATOMIC_DETAIL_EXTRA_BACKEND gcc_arm
+
+#elif (defined(__GNUC__) || defined(__SUNPRO_CC)) && (defined(__sparcv8plus) || defined(__sparc_v9__))
+
+#define BOOST_ATOMIC_DETAIL_PLATFORM gcc_sparc
+
+#elif defined(__GNUC__) && defined(__alpha__)
+
+#define BOOST_ATOMIC_DETAIL_PLATFORM gcc_alpha
+
+#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
+
+#define BOOST_ATOMIC_DETAIL_PLATFORM msvc_x86
+
+#elif defined(_MSC_VER) && _MSC_VER >= 1700 && (defined(_M_ARM) || defined(_M_ARM64))
+
+#define BOOST_ATOMIC_DETAIL_PLATFORM msvc_arm
+
+#endif
+
+// Compiler-based backends
+
+// IBM XL C++ Compiler has to be checked before GCC/Clang as it pretends to be one but does not support __atomic* intrinsics.
+// It does support GCC inline assembler though.
+#if !(defined(__ibmxl__) || defined(__IBMCPP__)) &&\
+ ((defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 407)) ||\
+ (defined(BOOST_CLANG) && ((__clang_major__ * 100 + __clang_minor__) >= 302))) &&\
+ (\
+ (__GCC_ATOMIC_BOOL_LOCK_FREE + 0) == 2 ||\
+ (__GCC_ATOMIC_CHAR_LOCK_FREE + 0) == 2 ||\
+ (__GCC_ATOMIC_SHORT_LOCK_FREE + 0) == 2 ||\
+ (__GCC_ATOMIC_INT_LOCK_FREE + 0) == 2 ||\
+ (__GCC_ATOMIC_LONG_LOCK_FREE + 0) == 2 ||\
+ (__GCC_ATOMIC_LLONG_LOCK_FREE + 0) == 2\
+ )
+
+#define BOOST_ATOMIC_DETAIL_BACKEND gcc_atomic
+
+#elif defined(BOOST_ATOMIC_DETAIL_PLATFORM)
+
+#define BOOST_ATOMIC_DETAIL_BACKEND BOOST_ATOMIC_DETAIL_PLATFORM
+
+#elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 401) &&\
+ (\
+ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1) ||\
+ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2) ||\
+ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) ||\
+ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8) ||\
+ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16)\
+ )
+
+#define BOOST_ATOMIC_DETAIL_BACKEND gcc_sync
+
+#endif
+
+// OS-based backends
+
+#if !defined(BOOST_ATOMIC_DETAIL_BACKEND)
+
+#if defined(__linux__) && defined(__arm__)
+
+#define BOOST_ATOMIC_DETAIL_BACKEND linux_arm
+
+#elif defined(BOOST_WINDOWS) || defined(_WIN32_CE)
+
+#define BOOST_ATOMIC_DETAIL_BACKEND windows
+
+#endif
+
+#endif // !defined(BOOST_ATOMIC_DETAIL_BACKEND)
+
+#endif // !defined(BOOST_ATOMIC_FORCE_FALLBACK)
+
+#if !defined(BOOST_ATOMIC_DETAIL_BACKEND)
+#define BOOST_ATOMIC_DETAIL_BACKEND emulated
+#define BOOST_ATOMIC_EMULATED
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_FP_BACKEND)
+#define BOOST_ATOMIC_DETAIL_FP_BACKEND generic
+#define BOOST_ATOMIC_DETAIL_FP_BACKEND_GENERIC
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_EXTRA_BACKEND)
+#define BOOST_ATOMIC_DETAIL_EXTRA_BACKEND generic
+#define BOOST_ATOMIC_DETAIL_EXTRA_BACKEND_GENERIC
+#endif
+
+#if !defined(BOOST_ATOMIC_DETAIL_EXTRA_FP_BACKEND)
+#define BOOST_ATOMIC_DETAIL_EXTRA_FP_BACKEND generic
+#define BOOST_ATOMIC_DETAIL_EXTRA_FP_BACKEND_GENERIC
+#endif
+
+#define BOOST_ATOMIC_DETAIL_BACKEND_HEADER(prefix) <BOOST_JOIN(prefix, BOOST_ATOMIC_DETAIL_BACKEND).hpp>
+#define BOOST_ATOMIC_DETAIL_FP_BACKEND_HEADER(prefix) <BOOST_JOIN(prefix, BOOST_ATOMIC_DETAIL_FP_BACKEND).hpp>
+#define BOOST_ATOMIC_DETAIL_EXTRA_BACKEND_HEADER(prefix) <BOOST_JOIN(prefix, BOOST_ATOMIC_DETAIL_EXTRA_BACKEND).hpp>
+#define BOOST_ATOMIC_DETAIL_EXTRA_FP_BACKEND_HEADER(prefix) <BOOST_JOIN(prefix, BOOST_ATOMIC_DETAIL_EXTRA_FP_BACKEND).hpp>
+
+#endif // BOOST_ATOMIC_DETAIL_PLATFORM_HPP_INCLUDED_