path: root/attic/test/Aligned_Allocator.hpp

/* 
 * File:   Aligned_Allocator.hpp
 * Author: atlas
 *
 * Created on July 5, 2013, 6:52 PM


Boost Software License - Version 1.0 - August 17th, 2003

Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
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Software, and to permit third-parties to whom the Software is furnished to
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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*/


#include <cstddef>
#include <memory>
#include <type_traits>
#include <typeinfo>
#include <vector>


//! \def BOOST_AFIO_PACKEDTYPE(typedecl) The markup this compiler uses to pack a structure as tightly as possible
#ifndef BOOST_AFIO_PACKEDTYPE
#ifdef BOOST_MSVC
#define BOOST_AFIO_PACKEDTYPE(typedecl) __pragma(pack(push, 1)) typedecl __pragma(pack(pop))
#elif defined(__GNUC__)
#define BOOST_AFIO_PACKEDTYPE(typedecl) typedecl __attribute__((packed))
#else
#define BOOST_AFIO_PACKEDTYPE(typedecl) unknown_type_pack_markup_for_this_compiler
#endif
#endif



BOOST_AFIO_V2_NAMESPACE_BEGIN
        namespace detail {
enum class allocator_alignment : size_t
{
    Default = sizeof(void*), //!< The default alignment on this machine.
    SSE    = 16,            //!< The alignment for SSE. Better to use M128 for NEON et al support.
    M128   = 16,            //!< The alignment for a 128 bit vector.
    AVX    = 32,            //!< The alignment for AVX. Better to use M256 for NEON et al support.
    M256   = 32             //!< The alignment for a 256 bit vector.
};      
#ifdef BOOST_WINDOWS
    extern "C" void *_aligned_malloc(size_t size, size_t alignment);
    extern "C" void _aligned_free(void *blk);
#else
    extern "C" int posix_memalign(void **memptr, size_t alignment, size_t size);
#endif
    inline void* allocate_aligned_memory(size_t align, size_t size)
    {
#ifdef BOOST_WINDOWS
        return _aligned_malloc(size, align);
#else
        void *ret=nullptr;
        if(posix_memalign(&ret, align, size)) return nullptr;
        return ret;
#endif
    }
    inline void deallocate_aligned_memory(void* ptr) noexcept
    {
#ifdef BOOST_WINDOWS
        _aligned_free(ptr);
#else
        free(ptr);
#endif
    }
       

/*! \class aligned_allocator
\brief An STL allocator which allocates aligned memory

Stolen from http://stackoverflow.com/questions/12942548/making-stdvector-allocate-aligned-memory
*/
template <typename T, size_t Align=std::alignment_of<T>::value, bool initialize=true>
class aligned_allocator
{
public:
    typedef T         value_type;
    typedef T*        pointer;
    typedef const T*  const_pointer;
    typedef T& reference;
    typedef const T&  const_reference;
    typedef size_t    size_type;
    typedef ptrdiff_t difference_type;
    enum { alignment=Align };

    typedef std::true_type propagate_on_container_move_assignment;

    template <class U>
    struct rebind { typedef aligned_allocator<U, Align, initialize> other; };

public:
    aligned_allocator() noexcept
    {}

    template <class U>
    aligned_allocator(const aligned_allocator<U, Align, initialize>&) noexcept
    {}

    size_type
    max_size() const noexcept
    { return (size_type(~0) - size_type(Align)) / sizeof(T); }

    pointer
    address(reference x) const noexcept
    { return std::addressof(x); }

    const_pointer
    address(const_reference x) const noexcept
    { return std::addressof(x); }

    pointer
    allocate(size_type n, typename aligned_allocator<void, Align, initialize>::const_pointer = 0)
    {
        const size_type alignment = static_cast<size_type>( Align );
        void* ptr = detail::allocate_aligned_memory(alignment , n * sizeof(T));
        if (ptr == nullptr) {
            throw std::bad_alloc();
        }

        return reinterpret_cast<pointer>(ptr);
    }

    void
    deallocate(pointer p, size_type) noexcept
    { return detail::deallocate_aligned_memory(p); }

    template <class U, class ...Args>
    void
    construct(U* p, Args&&... args)
    { if(initialize || !std::is_same<char, U>::value) ::new(reinterpret_cast<void*>(p)) U(std::forward<Args>(args)...); }

    void
    destroy(pointer p)
    { (void) p; p->~T(); }
};

template <size_t Align, bool initialize> class aligned_allocator<void, Align, initialize>
{
public:
    typedef void         value_type;
    typedef void *  pointer;
    typedef const void *  const_pointer;
    typedef void reference;
    typedef const void  const_reference;
    typedef size_t    size_type;
    typedef ptrdiff_t difference_type;
    enum { alignment=Align };
};
template <size_t Align, bool initialize> class aligned_allocator<const void, Align, initialize>
{
public:
    typedef const void         value_type;
    typedef const void*  pointer;
    typedef const void*  const_pointer;
    typedef void reference;
    typedef const void  const_reference;
    typedef size_t    size_type;
    typedef ptrdiff_t difference_type;
    enum { alignment=Align };
};

template <typename T, size_t Align, bool initialize>
class aligned_allocator<const T, Align, initialize>
{
public:
    typedef T         value_type;
    typedef const T*  pointer;
    typedef const T*  const_pointer;
    typedef T& reference;
    typedef const T&  const_reference;
    typedef size_t    size_type;
    typedef ptrdiff_t difference_type;
    enum { alignment=Align };

    typedef std::true_type propagate_on_container_move_assignment;

    template <class U>
    struct rebind { typedef aligned_allocator<U, Align, initialize> other; };

public:
    aligned_allocator() noexcept
    {}

    template <class U>
    aligned_allocator(const aligned_allocator<U, Align, initialize>&) noexcept
    {}

    size_type
    max_size() const noexcept
    { return (size_type(~0) - size_type(Align)) / sizeof(T); }

    const_pointer
    address(const_reference x) const noexcept
    { return std::addressof(x); }

    pointer
    allocate(size_type n, typename aligned_allocator<void, Align, initialize>::const_pointer = 0)
    {
        const size_type alignment = static_cast<size_type>( Align );
        void* ptr = detail::allocate_aligned_memory(alignment , n * sizeof(T));
        if (ptr == nullptr) {
            throw std::bad_alloc();
        }

        return reinterpret_cast<pointer>(ptr);
    }

    void
    deallocate(pointer p, size_type) noexcept
    { return detail::deallocate_aligned_memory(p); }

    template <class U, class ...Args>
    void
    construct(U* p, Args&&... args)
    { if(initialize || !std::is_same<char, U>::value) ::new(reinterpret_cast<void*>(p)) U(std::forward<Args>(args)...); }

    void
    destroy(pointer p)
    { p->~T(); }
};

template <typename T, size_t TAlign, bool Tinit, typename U, size_t UAlign, bool Uinit>
inline
bool
operator== (const aligned_allocator<T,TAlign,Tinit>&, const aligned_allocator<U, UAlign, Uinit>&) noexcept
{ return TAlign == UAlign; }

template <typename T, size_t TAlign, bool Tinit, typename U, size_t UAlign, bool Uinit>
inline
bool
operator!= (const aligned_allocator<T,TAlign,Tinit>&, const aligned_allocator<U, UAlign, Uinit>&) noexcept
{ return TAlign != UAlign; }


        }//namespace detail
BOOST_AFIO_V2_NAMESPACE_END