tmp/tmppt64nkz7/{from.md → to.md}
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| 1 |
+
#### Mask permute <a id="simd.permute.mask">[[simd.permute.mask]]</a>
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``` cpp
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template<simd-vec-type V>
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constexpr V compress(const V& v, const typename V::mask_type& selector);
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template<simd-mask-type M>
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constexpr M compress(const M& v, const type_identity_t<M>& selector);
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```
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Let:
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- *`bit-index`*`(`i`)` be a function which returns the index of the iᵗʰ
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element of `selector` that is `true`.
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- *`select-value`*`(`i`)` be a function which returns
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`v[`*`bit-index`*`(`i`)]` for i in the range \[`0`,
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`reduce_count(selector)`) and a valid but unspecified value otherwise.
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\[*Note 1*: Different calls to *`select-value`* can return different
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unspecified values. — *end note*]
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*Returns:* A data-parallel object where the iᵗʰ element is initialized
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to the result of *`select-value`*`(`i`)` for all i in the range \[`0`,
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`V::size()`).
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``` cpp
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template<simd-vec-type V>
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constexpr V compress(const V& v, const typename V::mask_type& selector,
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const typename V::value_type& fill_value);
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template<simd-mask-type M>
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constexpr M compress(const M& v, const type_identity_t<M>& selector,
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const typename M::value_type& fill_value);
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```
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Let:
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- *`bit-index`*`(`i`)` be a function which returns the index of the iᵗʰ
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element of `selector` that is `true`.
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- *`select-value`*`(`i`)` be a function which returns
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`v[`*`bit-index`*`(`i`)]` for i in the range \[`0`,
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`reduce_count(selector)`) and `fill_value` otherwise.
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*Returns:* A data-parallel object where the iᵗʰ element is initialized
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to the result of *`select-value`*`(`i`)` for all i in the range \[`0`,
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`V::size()`).
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``` cpp
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template<simd-vec-type V>
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constexpr V expand(const V& v, const typename V::mask_type& selector, const V& original = {});
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template<simd-mask-type M>
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constexpr M expand(const M& v, const type_identity_t<M>& selector, const M& original = {});
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```
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Let:
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- *set-indices* be a list of the index positions of `true` elements in
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`selector`, in ascending order.
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- *`bit-lookup`*`(`b`)` be a function which returns the index where b
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appears in *`set-indices`*.
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- *`select-value`*`(`i`)` be a function which returns
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`v[`*`bit-lookup`*`(`i`)]` if `selector[`i`]` is `true`, otherwise
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returns `original[`i`]`.
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*Returns:* A data-parallel object where the iᵗʰ element is initialized
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to the result of *`select-value`*`(`i`)` for all i in the range \[`0`,
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`V::size()`).
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