std::experimental::simd_abi::fixed_size

 

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simd_abi::scalar simd_abi::fixed_size	simd_abi::native simd_abi::compatible	simd_abi::max_fixed_size simd_abi::deduce
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element_aligned_tagelement_aligned	vector_aligned_tagvector_aligned	overaligned_tagoveraligned
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simd_caststatic_simd_cast	to_fixed_sizeto_compatibleto_native	split concat
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Defined in header <experimental/simd>
template < int N > struct fixed_size {};		(parallelism TS v2)

The simd_abi::fixed_size<N> tag type ensures data-parallel types to store and manipulate N elements (i.e. simd<T, simd_abi::fixed_size<N>>::size() returns N). An implementation shall support at least all N ∈ [1 … 32]. Additionally, for every supported simd<T, Abi>, where Abi is an implementation-defined ABI tag, N = simd<T, Abi>::size() shall be supported.

Notes

An implementation may choose to forego ABI compatibility between differently compiled translation units for simd and simd_mask instantiations using the same simd_abi::fixed_size<N> tag. Otherwise, the efficiency of simd<T, Abi> is likely to be better than simd<T, fixed_size<simd_size_v<T, Abi>>> (with Abi not an instance of simd_abi::fixed_size).

See also

max_fixed_size (parallelism TS v2)	the maximum number of elements guaranteed to be supported by fixed (constant)
scalar (parallelism TS v2)	tag type for storing a single element (typedef)
compatible (parallelism TS v2)	tag type that ensures ABI compatibility (alias template)
native (parallelism TS v2)	tag type that is most efficient (alias template)
deduce deduce_t (parallelism TS v2)	obtains an ABI type for given element type and number of elements (class template)