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/***************************************************************************
* 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
{
/**
* @ingroup architectures
*
* Dummy architectures that only appears in a list of architecture when no
* other architecture has been detected.
*/
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
{
// 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 <unsigned... Vals>
struct is_sorted;
template <>
struct is_sorted<> : std::true_type
{
};
template <unsigned Val>
struct is_sorted<Val> : std::true_type
{
};
template <unsigned V0, unsigned V1, unsigned... Vals>
struct is_sorted<V0, V1, Vals...>
: std::conditional<(V0 >= V1), is_sorted<V1, Vals...>,
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...);
}
template <typename... Ts>
struct head;
template <typename T, typename... Ts>
struct head<T, Ts...>
{
using type = T;
};
template <>
struct head<>
{
using type = unavailable;
};
} // 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::version()...>::value,
"architecture list must be sorted by version");
#endif
using best = typename detail::head<Archs...>::type;
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 inline 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));
}
};
namespace detail
{
// 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
using all_x86_architectures = arch_list<
avx512vnni<avx512vbmi>, avx512vbmi, avx512ifma, avx512pf, avx512vnni<avx512bw>, avx512bw, avx512er, avx512dq, avx512cd, avx512f,
avxvnni, fma3<avx2>, avx2, fma3<avx>, avx, fma4, fma3<sse4_2>,
sse4_2, sse4_1, /*sse4a,*/ ssse3, sse3, sse2>;
using all_sve_architectures = arch_list<detail::sve<512>, detail::sve<256>, detail::sve<128>>;
using all_rvv_architectures = arch_list<detail::rvv<512>, detail::rvv<256>, detail::rvv<128>>;
using all_arm_architectures = typename detail::join<all_sve_architectures, arch_list<neon64, neon>>::type;
using all_riscv_architectures = all_rvv_architectures;
using all_wasm_architectures = arch_list<wasm>;
using all_architectures = typename detail::join<all_riscv_architectures, all_wasm_architectures, all_arm_architectures, all_x86_architectures>::type;
using supported_architectures = typename detail::supported<all_architectures>::type;
using x86_arch = typename detail::supported<all_x86_architectures>::type::best;
using arm_arch = typename detail::supported<all_arm_architectures>::type::best;
using riscv_arch = typename detail::supported<all_riscv_architectures>::type::best;
using best_arch = typename supported_architectures::best;
#ifdef XSIMD_DEFAULT_ARCH
using default_arch = XSIMD_DEFAULT_ARCH;
#else
using default_arch = best_arch;
#endif
namespace detail
{
template <class F, class ArchList>
class dispatcher
{
const decltype(available_architectures()) availables_archs;
F functor;
template <class Arch, class... Tys>
inline 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>
inline auto walk_archs(arch_list<Arch, ArchNext, Archs...>, Tys&&... args) noexcept -> decltype(functor(Arch {}, std::forward<Tys>(args)...))
{
if (availables_archs.has(Arch {}))
return functor(Arch {}, std::forward<Tys>(args)...);
else
return walk_archs(arch_list<ArchNext, Archs...> {}, std::forward<Tys>(args)...);
}
public:
inline dispatcher(F f) noexcept
: availables_archs(available_architectures())
, functor(f)
{
}
template <class... Tys>
inline 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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