ceph/src/boost/libs/atomic/include/boost/atomic/detail/caps_gcc_arm.hpp

   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) 2009 Helge Bahmann
   7  * Copyright (c) 2009 Phil Endecott
   8  * Copyright (c) 2013 Tim Blechmann
   9  * ARM Code by Phil Endecott, based on other architectures.
  10  * Copyright (c) 2014 Andrey Semashev
  11  */
  12 /*!
  13  * \file   atomic/detail/caps_gcc_arm.hpp
  14  *
  15  * This header defines feature capabilities macros
  16  */
  17
  18 #ifndef BOOST_ATOMIC_DETAIL_CAPS_GCC_ARM_HPP_INCLUDED_
  19 #define BOOST_ATOMIC_DETAIL_CAPS_GCC_ARM_HPP_INCLUDED_
  20
  21 #include <boost/atomic/detail/config.hpp>
  22
  23 #ifdef BOOST_HAS_PRAGMA_ONCE
  24 #pragma once
  25 #endif
  26
  27 #if !(defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__))
  28 // ARMv7 and later have dmb instruction
  29 #define BOOST_ATOMIC_DETAIL_ARM_HAS_DMB 1
  30 #endif
  31
  32 #if !(defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6Z__))
  33 // ARMv6k and ARMv7 have 8 and 16 ldrex/strex variants
  34 #define BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXB_STREXB 1
  35 #define BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXH_STREXH 1
  36 #if !(((defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)) && defined(__thumb__)) || defined(__ARM_ARCH_7M__))
  37 // ARMv6k and ARMv7 except ARMv7-M have 64-bit ldrex/strex variants.
  38 // Unfortunately, GCC (at least 4.7.3 on Ubuntu) does not allocate register pairs properly when targeting ARMv6k Thumb,
  39 // which is required for ldrexd/strexd instructions, so we disable 64-bit support. When targeting ARMv6k ARM
  40 // or ARMv7 (both ARM and Thumb 2) it works as expected.
  41 #define BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXD_STREXD 1
  42 #endif
  43 #endif
  44
  45 #define BOOST_ATOMIC_INT8_LOCK_FREE 2
  46 #define BOOST_ATOMIC_INT16_LOCK_FREE 2
  47 #define BOOST_ATOMIC_INT32_LOCK_FREE 2
  48 #if defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXD_STREXD)
  49 #define BOOST_ATOMIC_INT64_LOCK_FREE 2
  50 #endif
  51 #define BOOST_ATOMIC_POINTER_LOCK_FREE 2
  52
  53 #define BOOST_ATOMIC_THREAD_FENCE 2
  54 #define BOOST_ATOMIC_SIGNAL_FENCE 2
  55
  56 #endif // BOOST_ATOMIC_DETAIL_CAPS_GCC_ARM_HPP_INCLUDED_