1/*
2 * Distributed under the Boost Software License, Version 1.0.
3 * (See accompanying file LICENSE_1_0.txt or copy at
4 * http://www.boost.org/LICENSE_1_0.txt)
5 *
6 * Copyright (c) 2012 Hartmut Kaiser
7 * Copyright (c) 2014 Andrey Semashev
8 */
9/*!
10 * \file atomic/detail/config.hpp
11 *
12 * This header defines configuraion macros for Boost.Atomic
13 */
14
15#ifndef BOOST_ATOMIC_DETAIL_CONFIG_HPP_INCLUDED_
16#define BOOST_ATOMIC_DETAIL_CONFIG_HPP_INCLUDED_
17
18#include <boost/config.hpp>
19
20#ifdef BOOST_HAS_PRAGMA_ONCE
21#pragma once
22#endif
23
24#if defined(__has_builtin)
25#if __has_builtin(__builtin_memcpy)
26#define BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY
27#endif
28#if __has_builtin(__builtin_memcmp)
29#define BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCMP
30#endif
31#elif defined(BOOST_GCC)
32#define BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY
33#define BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCMP
34#endif
35
36#if defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY)
37#define BOOST_ATOMIC_DETAIL_MEMCPY __builtin_memcpy
38#else
39#define BOOST_ATOMIC_DETAIL_MEMCPY std::memcpy
40#endif
41
42#if defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCMP)
43#define BOOST_ATOMIC_DETAIL_MEMCMP __builtin_memcmp
44#else
45#define BOOST_ATOMIC_DETAIL_MEMCMP std::memcmp
46#endif
47
48#if defined(__CUDACC__)
49// nvcc does not support alternatives in asm statement constraints
50#define BOOST_ATOMIC_DETAIL_NO_ASM_CONSTRAINT_ALTERNATIVES
51// nvcc does not support condition code register ("cc") clobber in asm statements
52#define BOOST_ATOMIC_DETAIL_NO_ASM_CLOBBER_CC
53#endif
54
55#if !defined(BOOST_ATOMIC_DETAIL_NO_ASM_CLOBBER_CC)
56#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC "cc"
57#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "cc",
58#else
59#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC
60#define BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA
61#endif
62
63#if ((defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)) && (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) < 403)) ||\
64 defined(__SUNPRO_CC)
65// This macro indicates we're using older binutils that don't support implied zero displacements for memory opereands,
66// making code like this invalid:
67// movl 4+(%%edx), %%eax
68#define BOOST_ATOMIC_DETAIL_NO_ASM_IMPLIED_ZERO_DISPLACEMENTS
69#endif
70
71#if defined(__clang__) || (defined(BOOST_GCC) && (BOOST_GCC+0) < 40500) || defined(__SUNPRO_CC)
72// This macro indicates that the compiler does not support allocating rax:rdx register pairs ("A") in asm blocks
73#define BOOST_ATOMIC_DETAIL_NO_ASM_RAX_RDX_PAIRS
74#endif
75
76#if defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
77#if !(defined(BOOST_LIBSTDCXX11) && (BOOST_LIBSTDCXX_VERSION+0) >= 40700) /* libstdc++ from gcc >= 4.7 in C++11 mode */
78// This macro indicates that there is no <type_traits> standard header that is sufficient for Boost.Atomic needs.
79#define BOOST_ATOMIC_DETAIL_NO_CXX11_HDR_TYPE_TRAITS
80#endif
81#endif // defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
82
83// Enable pointer/reference casts between storage and value when possible.
84// Note: Despite that MSVC does not employ strict aliasing rules for optimizations
85// and does not require an explicit markup for types that may alias, we still don't
86// enable the optimization for this compiler because at least MSVC-8 and 9 are known
87// to generate broken code sometimes when casts are used.
88#if defined(__GNUC__) && (!defined(BOOST_INTEL_CXX_VERSION) || (BOOST_INTEL_CXX_VERSION+0) >= 1300)
89#define BOOST_ATOMIC_DETAIL_MAY_ALIAS __attribute__((__may_alias__))
90#define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_MAY_ALIAS
91#elif defined(__has_attribute)
92#if __has_attribute(__may_alias__)
93#define BOOST_ATOMIC_DETAIL_MAY_ALIAS __attribute__((__may_alias__))
94#define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_MAY_ALIAS
95#endif
96#endif
97
98#if !defined(BOOST_ATOMIC_DETAIL_MAY_ALIAS)
99#define BOOST_ATOMIC_DETAIL_MAY_ALIAS
100#endif
101
102#endif // BOOST_ATOMIC_DETAIL_CONFIG_HPP_INCLUDED_
103