From Jason Turner

[simd.mask.reductions]

C++23 → Trunk 2.0 KB 76 lines
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+ #### Reductions <a id="simd.mask.reductions">[[simd.mask.reductions]]</a>
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+
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+ ``` cpp
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+ template<size_t Bytes, class Abi>
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+ constexpr bool all_of(const basic_mask<Bytes, Abi>& k) noexcept;
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+ ```
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+
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+ *Returns:* `true` if all boolean elements in `k` are `true`, otherwise
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+ `false`.
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+
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+ ``` cpp
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+ template<size_t Bytes, class Abi>
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+ constexpr bool any_of(const basic_mask<Bytes, Abi>& k) noexcept;
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+ ```
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+
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+ *Returns:* `true` if at least one boolean element in `k` is `true`,
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+ otherwise `false`.
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+
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+ ``` cpp
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+ template<size_t Bytes, class Abi>
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+ constexpr bool none_of(const basic_mask<Bytes, Abi>& k) noexcept;
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+ ```
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+
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+ *Returns:* `!any_of(k)`.
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+
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+ ``` cpp
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+ template<size_t Bytes, class Abi>
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+ constexpr simd-size-type reduce_count(const basic_mask<Bytes, Abi>& k) noexcept;
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+ ```
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+
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+ *Returns:* The number of boolean elements in `k` that are `true`.
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+
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+ ``` cpp
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+ template<size_t Bytes, class Abi>
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+ constexpr simd-size-type reduce_min_index(const basic_mask<Bytes, Abi>& k);
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+ ```
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+
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+ *Preconditions:* `any_of(k)` is `true`.
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+
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+ *Returns:* The lowest element index i where `k[`i`]` is `true`.
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+
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+ ``` cpp
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+ template<size_t Bytes, class Abi>
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+ constexpr simd-size-type reduce_max_index(const basic_mask<Bytes, Abi>& k);
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+ ```
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+
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+ *Preconditions:* `any_of(k)` is `true`.
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+
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+ *Returns:* The greatest element index i where `k[`i`]` is `true`.
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+
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+ ``` cpp
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+ constexpr bool all_of(same_as<bool> auto x) noexcept;
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+ constexpr bool any_of(same_as<bool> auto x) noexcept;
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+ constexpr simd-size-type reduce_count(same_as<bool> auto x) noexcept;
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+ ```
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+
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+ *Returns:* `x`.
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+
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+ ``` cpp
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+ constexpr bool none_of(same_as<bool> auto x) noexcept;
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+ ```
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+
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+ *Returns:* `!x`.
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+
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+ ``` cpp
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+ constexpr simd-size-type reduce_min_index(same_as<bool> auto x);
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+ constexpr simd-size-type reduce_max_index(same_as<bool> auto x);
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+ ```
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+
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+ *Preconditions:* `x` is `true`.
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+
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+ *Returns:* `0`.
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+