alignment.hpp

// Copyright (c) 2016 Lukasz Laszko
//
// 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)
#pragma once

#include <cstddef>
#include <cstdint>


namespace boost { namespace memory {
    
static constexpr std::size_t NO_ALIGNMENT = 1ul;

#if defined(__amd64__) || defined(__aarch64__)

static constexpr std::size_t WORD_ALIGNMENT = 8ul;
static constexpr std::size_t HALF_WORD_ALIGNMENT = 4ul;
#elif defined(__i686__) || defined(__arm__)
static constexpr std::size_t WORD_ALIGNMENT = 4ul;
static constexpr std::size_t HALF_WORD_ALIGNMENT = 2ul;
#else
#   error Unsupported CPU architecture
#endif

static constexpr bool is_power_of_2(std::size_t x) noexcept;  

template <std::size_t alignment>
inline constexpr std::uint8_t* align_forward(std::uint8_t* address) noexcept;

template <std::size_t alignment>
inline constexpr std::uint8_t* align_backward(std::uint8_t* address) noexcept;

template <std::size_t alignment>
inline constexpr std::size_t align_size(std::size_t size) noexcept;

} }

#include "alignment.ipp"