实验库头文件 <experimental/simd>
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< cpp | header | experimental
该头文件定义了类模板、标签类型、特性类型和函数模板，用于对数据并行对象进行逐元素操作。
[编辑] 概要
namespace std::experimental { inline namespace parallelism_v2 { namespace simd_abi { using scalar = /* see below */; template <int N> using fixed_size = /* see below */; template <class T> constexpr int max_fixed_size = /* implementation-defined */; template <class T> using compatible = /* implementation-defined */; template <class T> using native = /* implementation-defined */; template <class T, size_t N, class... Abis> struct deduce { using type = /* see below */; }; template <class T, size_t N, class... Abis> using deduce_t = typename deduce<T, N, Abis...>::type; } // namespace simd_abi struct element_aligned_tag {}; struct vector_aligned_tag {}; template <size_t> struct overaligned_tag {}; inline constexpr element_aligned_tag element_aligned{}; inline constexpr vector_aligned_tag vector_aligned{}; template <size_t N> constexpr overaligned_tag<N> overaligned{}; // 9.4, simd type traits template <class T> struct is_abi_tag; template <class T> constexpr bool is_abi_tag_v = is_abi_tag<T>::value; template <class T> struct is_simd; template <class T> constexpr bool is_simd_v = is_simd<T>::value; template <class T> struct is_simd_mask; template <class T> constexpr bool is_simd_mask_v = is_simd_mask<T>::value; template <class T> struct is_simd_flag_type; template <class T> constexpr bool is_simd_flag_type_v = is_simd_flag_type<T>::value; template <class T, class Abi = simd_abi::compatible<T>> struct simd_size; template <class T, class Abi = simd_abi::compatible<T>> constexpr size_t simd_size_v = simd_size<T, Abi>::value; template <class T, class U = typename T::value_type> struct memory_alignment; template <class T, class U = typename T::value_type> constexpr size_t memory_alignment_v = memory_alignment<T, U>::value; template <class T, class V> struct rebind_simd { using type = /* see below */; }; template <class T, class V> using rebind_simd_t = typename rebind_simd<T, V>::type; template <int N, class V> struct resize_simd { using type = /* see below */; }; template <int N, class V> using resize_simd_t = typename resize_simd<N, V>::type; // 9.6, Class template simd template <class T, class Abi = simd_abi::compatible<T>> class simd; template <class T> using native_simd = simd<T, simd_abi::native<T>>; template <class T, int N> using fixed_size_simd = simd<T, simd_abi::fixed_size<N>>; // 9.8, Class template simd_mask template <class T, class Abi = simd_abi::compatible<T>> class simd_mask; template <class T> using native_simd_mask = simd_mask<T, simd_abi::native<T>>; template <class T, int N> using fixed_size_simd_mask = simd_mask<T, simd_abi::fixed_size<N>>; // 9.7.5, Casts template <class T, class U, class Abi> /* see below */ simd_cast(const simd<U, Abi> &) noexcept; template <class T, class U, class Abi> /* see below */ static_simd_cast(const simd<U, Abi> &) noexcept; template <class T, class Abi> fixed_size_simd<T, simd_size_v<T, Abi>> to_fixed_size(const simd<T, Abi> &) noexcept; template <class T, class Abi> fixed_size_simd_mask<T, simd_size_v<T, Abi>> to_fixed_size(const simd_mask<T, Abi> &) noexcept; template <class T, int N> native_simd<T> to_native(const fixed_size_simd<T, N> &) noexcept; template <class T, int N> native_simd_mask<T> to_native(const fixed_size_simd_mask<T, N> &) noexcept; template <class T, int N> simd<T> to_compatible(const fixed_size_simd<T, N> &) noexcept; template <class T, int N> simd_mask<T> to_compatible(const fixed_size_simd_mask<T, N> &) noexcept; template <size_t... Sizes, class T, class Abi> tuple<simd<T, simd_abi::deduce_t<T, Sizes>>...> split(const simd<T, Abi> &) noexcept; template <size_t... Sizes, class T, class Abi> tuple<simd_mask<T, simd_mask_abi::deduce_t<T, Sizes>>...> split(const simd_mask<T, Abi> &) noexcept; template <class V, class Abi> array<V, simd_size_v<typename V::value_type, Abi> / V::size()> split(const simd<typename V::value_type, Abi> &) noexcept; template <class V, class Abi> array<V, simd_size_v<typename V::simd_type::value_type, Abi> / V::size()> split(const simd_mask<typename V::simd_type::value_type, Abi> &) noexcept; template <size_t N, class T, class A> array<resize_simd<simd_size_v<T, A> / N, simd<T, A>>, N> split_by(const simd<T, A> &x) noexcept; template <size_t N, class T, class A> array<resize_simd<simd_size_v<T, A> / N, simd_mask<T, A>>, N> split_by(const simd_mask<T, A> &x) noexcept; template <class T, class... Abis> simd<T, simd_abi::deduce_t<T, (simd_size_v<T, Abis> + ...)>> concat(const simd<T, Abis> &...) noexcept; template <class T, class... Abis> simd_mask<T, simd_abi::deduce_t<T, (simd_size_v<T, Abis> + ...)>> concat(const simd_mask<T, Abis> &...) noexcept; template <class T, class Abi, size_t N> resize_simd<simd_size_v<T, Abi> * N, simd<T, Abi>> concat(const array<simd<T, Abi>, N> &arr) noexcept; template <class T, class Abi, size_t N> resize_simd<simd_size_v<T, Abi> * N, simd_mask<T, Abi>> concat(const array<simd_mask<T, Abi>, N> &arr) noexcept; // 9.9.4, Reductions template <class T, class Abi> bool all_of(const simd_mask<T, Abi> &) noexcept; template <class T, class Abi> bool any_of(const simd_mask<T, Abi> &) noexcept; template <class T, class Abi> bool none_of(const simd_mask<T, Abi> &) noexcept; template <class T, class Abi> bool some_of(const simd_mask<T, Abi> &) noexcept; template <class T, class Abi> int popcount(const simd_mask<T, Abi> &) noexcept; template <class T, class Abi> int find_first_set(const simd_mask<T, Abi> &); template <class T, class Abi> int find_last_set(const simd_mask<T, Abi> &); bool all_of(T) noexcept; bool any_of(T) noexcept; bool none_of(T) noexcept; bool some_of(T) noexcept; int popcount(T) noexcept; int find_first_set(T); int find_last_set(T); // 9.5, Where expression class templates template <class M, class T> class const_where_expression; template <class M, class T> class where_expression; // 9.9.5, Where functions template <class T, class Abi> where_expression<simd_mask<T, Abi>, simd<T, Abi>> where(const typename simd<T, Abi>::mask_type &, simd<T, Abi> &) noexcept; template <class T, class Abi> const_where_expression<simd_mask<T, Abi>, simd<T, Abi>> where(const typename simd<T, Abi>::mask_type &, const simd<T, Abi> &) noexcept; template <class T, class Abi> where_expression<simd_mask<T, Abi>, simd_mask<T, Abi>> where(const type_identity_t<simd_mask<T, Abit>> &, simd_mask<T, Abi> &) noexcept; template <class T, class Abi> const_where_expression<simd_mask<T, Abi>, simd_mask<T, Abi>> where(const type_identity_t<simd_mask<T, Abit>> &, const simd_mask<T, Abi> &) noexcept; template <class T> where_expression<bool, T> where(/* see below */ k, T &d) noexcept; template <class T> const_where_expression<bool, T> where(/* see below */ k, const T &d) noexcept; // 9.7.4, Reductions template <class T, class Abi, class BinaryOperation = plus<>> T reduce(const simd<T, Abi> &, BinaryOperation = {}); template <class M, class V, class BinaryOperation> typename V::value_type reduce(const const_where_expression<M, V> &x, typename V::value_type identity_element, BinaryOperation binary_op); template <class M, class V> typename V::value_type reduce(const const_where_expression<M, V> &x, plus<> binary_op = {}) noexcept; template <class M, class V> typename V::value_type reduce(const const_where_expression<M, V> &x, multiplies<> binary_op) noexcept; template <class M, class V> typename V::value_type reduce(const const_where_expression<M, V> &x, bit_and<> binary_op) noexcept; template <class M, class V> typename V::value_type reduce(const const_where_expression<M, V> &x, bit_or<> binary_op) noexcept; template <class M, class V> typename V::value_type reduce(const const_where_expression<M, V> &x, bit_xor<> binary_op) noexcept; template <class T, class Abi> T hmin(const simd<T, abi> &) noexcept; template <class M, class V> typename V::value_type hmin(const const_where_expression<M, V> &) noexcept; template <class T, class Abi> T hmax(const simd<T, abi> &) noexcept; template <class M, class V> typename V::value_type hmax(const const_where_expression<M, V> &) noexcept; // 9.7.6, Algorithms template <class T, class Abi> simd<T, Abi> min(const simd<T, Abi> &a, const simd<T, Abi> &b) noexcept; template <class T, class Abi> simd<T, Abi> max(const simd<T, Abi> &a, const simd<T, Abi> &b) noexcept; template <class T, class Abi> pair<simd<T, Abi>, simd<T, Abi>> minmax(const simd<T, Abi> &a, const simd<T, Abi> &b) noexcept; template <class T, class Abi> simd<T, Abi> clamp(const simd<T, Abi> &v, const simd<T, Abi> &lo, const simd<T, Abi> &hi); } // namespace parallelism_v2 } // namespace std::experimental
