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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_BATCH_CONSTANT_HPP
#define XSIMD_BATCH_CONSTANT_HPP
#include "./xsimd_batch.hpp"
#include "./xsimd_utils.hpp"
namespace xsimd
{
/**
* @brief batch of boolean constant
*
* Abstract representation of a batch of boolean constants.
*
* @tparam batch_type the type of the associated batch values.
* @tparam Values boolean constant represented by this batch
**/
template <class batch_type, bool... Values>
struct batch_bool_constant
{
public:
static constexpr std::size_t size = sizeof...(Values);
using arch_type = typename batch_type::arch_type;
using value_type = bool;
static_assert(sizeof...(Values) == batch_type::size, "consistent batch size");
constexpr operator batch_bool<typename batch_type::value_type, arch_type>() const noexcept { return { Values... }; }
constexpr bool get(size_t i) const noexcept
{
return std::array<value_type, size> { { Values... } }[i];
}
static constexpr int mask() noexcept
{
return mask_helper(0, static_cast<int>(Values)...);
}
private:
static constexpr int mask_helper(int acc) noexcept { return acc; }
template <class... Tys>
static constexpr int mask_helper(int acc, int mask, Tys... masks) noexcept
{
return mask_helper(acc | mask, (masks << 1)...);
}
struct logical_or
{
constexpr bool operator()(bool x, bool y) const { return x || y; }
};
struct logical_and
{
constexpr bool operator()(bool x, bool y) const { return x && y; }
};
struct logical_xor
{
constexpr bool operator()(bool x, bool y) const { return x ^ y; }
};
template <class F, class SelfPack, class OtherPack, size_t... Indices>
static constexpr batch_bool_constant<batch_type, F()(std::tuple_element<Indices, SelfPack>::type::value, std::tuple_element<Indices, OtherPack>::type::value)...>
apply(detail::index_sequence<Indices...>)
{
return {};
}
template <class F, bool... OtherValues>
static constexpr auto apply(batch_bool_constant<batch_type, Values...>, batch_bool_constant<batch_type, OtherValues...>)
-> decltype(apply<F, std::tuple<std::integral_constant<bool, Values>...>, std::tuple<std::integral_constant<bool, OtherValues>...>>(detail::make_index_sequence<sizeof...(Values)>()))
{
static_assert(sizeof...(Values) == sizeof...(OtherValues), "compatible constant batches");
return apply<F, std::tuple<std::integral_constant<bool, Values>...>, std::tuple<std::integral_constant<bool, OtherValues>...>>(detail::make_index_sequence<sizeof...(Values)>());
}
public:
#define MAKE_BINARY_OP(OP, NAME) \
template <bool... OtherValues> \
constexpr auto operator OP(batch_bool_constant<batch_type, OtherValues...> other) const \
-> decltype(apply<NAME>(*this, other)) \
{ \
return apply<NAME>(*this, other); \
}
MAKE_BINARY_OP(|, logical_or)
MAKE_BINARY_OP(||, logical_or)
MAKE_BINARY_OP(&, logical_and)
MAKE_BINARY_OP(&&, logical_and)
MAKE_BINARY_OP(^, logical_xor)
#undef MAKE_BINARY_OP
constexpr batch_bool_constant<batch_type, !Values...> operator!() const
{
return {};
}
constexpr batch_bool_constant<batch_type, !Values...> operator~() const
{
return {};
}
};
/**
* @brief batch of integral constants
*
* Abstract representation of a batch of integral constants.
*
* @tparam batch_type the type of the associated batch values.
* @tparam Values constants represented by this batch
**/
template <class batch_type, typename batch_type::value_type... Values>
struct batch_constant
{
static constexpr std::size_t size = sizeof...(Values);
using arch_type = typename batch_type::arch_type;
using value_type = typename batch_type::value_type;
static_assert(sizeof...(Values) == batch_type::size, "consistent batch size");
/**
* @brief Generate a batch of @p batch_type from this @p batch_constant
*/
inline operator batch_type() const noexcept { return { Values... }; }
/**
* @brief Get the @p i th element of this @p batch_constant
*/
constexpr value_type get(size_t i) const noexcept
{
return get(i, std::array<value_type, size> { Values... });
}
private:
constexpr value_type get(size_t i, std::array<value_type, size> const& values) const noexcept
{
return values[i];
}
struct arithmetic_add
{
constexpr value_type operator()(value_type x, value_type y) const { return x + y; }
};
struct arithmetic_sub
{
constexpr value_type operator()(value_type x, value_type y) const { return x - y; }
};
struct arithmetic_mul
{
constexpr value_type operator()(value_type x, value_type y) const { return x * y; }
};
struct arithmetic_div
{
constexpr value_type operator()(value_type x, value_type y) const { return x / y; }
};
struct arithmetic_mod
{
constexpr value_type operator()(value_type x, value_type y) const { return x % y; }
};
struct binary_and
{
constexpr value_type operator()(value_type x, value_type y) const { return x & y; }
};
struct binary_or
{
constexpr value_type operator()(value_type x, value_type y) const { return x | y; }
};
struct binary_xor
{
constexpr value_type operator()(value_type x, value_type y) const { return x ^ y; }
};
template <class F, class SelfPack, class OtherPack, size_t... Indices>
static constexpr batch_constant<batch_type, F()(std::tuple_element<Indices, SelfPack>::type::value, std::tuple_element<Indices, OtherPack>::type::value)...>
apply(detail::index_sequence<Indices...>)
{
return {};
}
template <class F, value_type... OtherValues>
static constexpr auto apply(batch_constant<batch_type, Values...>, batch_constant<batch_type, OtherValues...>)
-> decltype(apply<F, std::tuple<std::integral_constant<value_type, Values>...>, std::tuple<std::integral_constant<value_type, OtherValues>...>>(detail::make_index_sequence<sizeof...(Values)>()))
{
static_assert(sizeof...(Values) == sizeof...(OtherValues), "compatible constant batches");
return apply<F, std::tuple<std::integral_constant<value_type, Values>...>, std::tuple<std::integral_constant<value_type, OtherValues>...>>(detail::make_index_sequence<sizeof...(Values)>());
}
public:
#define MAKE_BINARY_OP(OP, NAME) \
template <value_type... OtherValues> \
constexpr auto operator OP(batch_constant<batch_type, OtherValues...> other) const \
-> decltype(apply<NAME>(*this, other)) \
{ \
return apply<NAME>(*this, other); \
}
MAKE_BINARY_OP(+, arithmetic_add)
MAKE_BINARY_OP(-, arithmetic_sub)
MAKE_BINARY_OP(*, arithmetic_mul)
MAKE_BINARY_OP(/, arithmetic_div)
MAKE_BINARY_OP(%, arithmetic_mod)
MAKE_BINARY_OP(&, binary_and)
MAKE_BINARY_OP(|, binary_or)
MAKE_BINARY_OP(^, binary_xor)
#undef MAKE_BINARY_OP
constexpr batch_constant<batch_type, (value_type)-Values...> operator-() const
{
return {};
}
constexpr batch_constant<batch_type, (value_type) + Values...> operator+() const
{
return {};
}
constexpr batch_constant<batch_type, (value_type)~Values...> operator~() const
{
return {};
}
};
namespace detail
{
template <class batch_type, class G, std::size_t... Is>
inline constexpr auto make_batch_constant(detail::index_sequence<Is...>) noexcept
-> batch_constant<batch_type, (typename batch_type::value_type)G::get(Is, sizeof...(Is))...>
{
return {};
}
template <class batch_type, class G, std::size_t... Is>
inline constexpr auto make_batch_bool_constant(detail::index_sequence<Is...>) noexcept
-> batch_bool_constant<batch_type, G::get(Is, sizeof...(Is))...>
{
return {};
}
} // namespace detail
/**
* @brief Build a @c batch_constant out of a generator function
*
* @tparam batch_type type of the (non-constant) batch to build
* @tparam G type used to generate that batch. That type must have a static
* member @c get that's used to generate the batch constant. Conversely, the
* generated batch_constant has value `{G::get(0, batch_size), ... , G::get(batch_size - 1, batch_size)}`
*
* The following generator produces a batch of `(n - 1, 0, 1, ... n-2)`
*
* @code
* struct Rot
* {
* static constexpr unsigned get(unsigned i, unsigned n)
* {
* return (i + n - 1) % n;
* }
* };
* @endcode
*/
template <class batch_type, class G>
inline constexpr auto make_batch_constant() noexcept -> decltype(detail::make_batch_constant<batch_type, G>(detail::make_index_sequence<batch_type::size>()))
{
return detail::make_batch_constant<batch_type, G>(detail::make_index_sequence<batch_type::size>());
}
template <class batch_type, class G>
inline constexpr auto make_batch_bool_constant() noexcept
-> decltype(detail::make_batch_bool_constant<batch_type, G>(
detail::make_index_sequence<batch_type::size>()))
{
return detail::make_batch_bool_constant<batch_type, G>(
detail::make_index_sequence<batch_type::size>());
}
} // namespace xsimd
#endif
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