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Editing: xsimd_arch.hpp

/***************************************************************************
 * Copyright (c) Johan Mabille, Sylvain Corlay, Wolf Vollprecht and         *
 * Martin Renou                                                             *
 * Copyright (c) QuantStack                                                 *
 * Copyright (c) Serge Guelton                                              *
 *                                                                          *
 * Distributed under the terms of the BSD 3-Clause License.                 *
 *                                                                          *
 * The full license is in the file LICENSE, distributed with this software. *
 ****************************************************************************/

#ifndef XSIMD_ARCH_HPP
#define XSIMD_ARCH_HPP

#include <initializer_list>
#include <type_traits>
#include <utility>

#include "../types/xsimd_all_registers.hpp"
#include "./xsimd_config.hpp"
#include "./xsimd_cpuid.hpp"

namespace xsimd
{

namespace detail
    {
        // Checks whether T appears in Tys.
        template <class T, class... Tys>
        struct contains;

template <class T>
        struct contains<T> : std::false_type
        {
        };

template <class T, class Ty, class... Tys>
        struct contains<T, Ty, Tys...>
            : std::conditional<std::is_same<Ty, T>::value, std::true_type,
                               contains<T, Tys...>>::type
        {
        };

template <class... Archs>
        struct is_sorted;

template <>
        struct is_sorted<> : std::true_type
        {
        };

template <class Arch>
        struct is_sorted<Arch> : std::true_type
        {
        };

template <class A0, class A1, class... Archs>
        struct is_sorted<A0, A1, Archs...>
            : std::conditional<(A0::version() >= A1::version()), is_sorted<Archs...>,
                               std::false_type>::type
        {
        };

template <typename T>
        inline constexpr T max_of(T value) noexcept
        {
            return value;
        }

template <typename T, typename... Ts>
        inline constexpr T max_of(T head0, T head1, Ts... tail) noexcept
        {
            return max_of((head0 > head1 ? head0 : head1), tail...);
        }

} // namespace detail

// An arch_list is a list of architectures, sorted by version number.
    template <class... Archs>
    struct arch_list
    {
#ifndef NDEBUG
        static_assert(detail::is_sorted<Archs...>::value,
                      "architecture list must be sorted by version");
#endif

template <class Arch>
        using add = arch_list<Archs..., Arch>;

template <class... OtherArchs>
        using extend = arch_list<Archs..., OtherArchs...>;

template <class Arch>
        static constexpr bool contains() noexcept
        {
            return detail::contains<Arch, Archs...>::value;
        }

template <class F>
        static void for_each(F&& f) noexcept
        {
            (void)std::initializer_list<bool> { (f(Archs {}), true)... };
        }

static constexpr std::size_t alignment() noexcept
        {
            // all alignments are a power of two
            return detail::max_of(Archs::alignment()..., static_cast<size_t>(0));
        }
    };

struct unavailable
    {
        static constexpr bool supported() noexcept { return false; }
        static constexpr bool available() noexcept { return false; }
        static constexpr unsigned version() noexcept { return 0; }
        static constexpr std::size_t alignment() noexcept { return 0; }
        static constexpr bool requires_alignment() noexcept { return false; }
        static constexpr char const* name() noexcept { return "<none>"; }
    };

namespace detail
    {
        // Pick the best architecture in arch_list L, which is the last
        // because architectures are sorted by version.
        template <class L>
        struct best;

template <>
        struct best<arch_list<>>
        {
            using type = unavailable;
        };

template <class Arch, class... Archs>
        struct best<arch_list<Arch, Archs...>>
        {
            using type = Arch;
        };

// Filter archlists Archs, picking only supported archs and adding
        // them to L.
        template <class L, class... Archs>
        struct supported_helper;

template <class L>
        struct supported_helper<L, arch_list<>>
        {
            using type = L;
        };

template <class L, class Arch, class... Archs>
        struct supported_helper<L, arch_list<Arch, Archs...>>
            : supported_helper<
                  typename std::conditional<Arch::supported(),
                                            typename L::template add<Arch>, L>::type,
                  arch_list<Archs...>>
        {
        };

template <class... Archs>
        struct supported : supported_helper<arch_list<>, Archs...>
        {
        };

// Joins all arch_list Archs in a single arch_list.
        template <class... Archs>
        struct join;

template <class Arch>
        struct join<Arch>
        {
            using type = Arch;
        };

template <class Arch, class... Archs, class... Args>
        struct join<Arch, arch_list<Archs...>, Args...>
            : join<typename Arch::template extend<Archs...>, Args...>
        {
        };
    } // namespace detail

struct unsupported
    {
    };
    using all_x86_architectures = arch_list<avx512bw, avx512dq, avx512cd, avx512f, fma3<avx2>, avx2, fma3<avx>, avx, fma4, fma3<sse4_2>, sse4_2, sse4_1, /*sse4a,*/ ssse3, sse3, sse2>;
    using all_arm_architectures = arch_list<neon64, neon>;
    using all_architectures = typename detail::join<all_arm_architectures, all_x86_architectures>::type;

using supported_architectures = typename detail::supported<all_architectures>::type;

using x86_arch = typename detail::best<typename detail::supported<all_x86_architectures>::type>::type;
    using arm_arch = typename detail::best<typename detail::supported<all_arm_architectures>::type>::type;
    // using default_arch = typename detail::best<typename detail::supported<arch_list</*arm_arch,*/ x86_arch>>::type>::type;
    using default_arch = typename std::conditional<std::is_same<x86_arch, unavailable>::value,
                                                   arm_arch,
                                                   x86_arch>::type;

namespace detail
    {
        template <class F, class ArchList>
        class dispatcher
        {

const unsigned best_arch;
            F functor;

template <class Arch, class... Tys>
            auto walk_archs(arch_list<Arch>, Tys&&... args) noexcept -> decltype(functor(Arch {}, std::forward<Tys>(args)...))
            {
                assert(Arch::available() && "At least one arch must be supported during dispatch");
                return functor(Arch {}, std::forward<Tys>(args)...);
            }

template <class Arch, class ArchNext, class... Archs, class... Tys>
            auto walk_archs(arch_list<Arch, ArchNext, Archs...>, Tys&&... args) noexcept -> decltype(functor(Arch {}, std::forward<Tys>(args)...))
            {
                if (Arch::version() <= best_arch)
                    return functor(Arch {}, std::forward<Tys>(args)...);
                else
                    return walk_archs(arch_list<ArchNext, Archs...> {}, std::forward<Tys>(args)...);
            }

public:
            dispatcher(F f) noexcept
                : best_arch(available_architectures().best)
                , functor(f)
            {
            }

template <class... Tys>
            auto operator()(Tys&&... args) noexcept -> decltype(functor(default_arch {}, std::forward<Tys>(args)...))
            {
                return walk_archs(ArchList {}, std::forward<Tys>(args)...);
            }
        };
    }

// Generic function dispatch, à la ifunc
    template <class ArchList = supported_architectures, class F>
    inline detail::dispatcher<F, ArchList> dispatch(F&& f) noexcept
    {
        return { std::forward<F>(f) };
    }

} // namespace xsimd

#endif

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