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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../experimental/simd/rebind_simd.html below:

std::experimental::rebind_simd, std::experimental::resize_simd - cppreference.com

template< class T, class V > struct rebind_simd;

(1) (parallelism TS v2)

template< int N, class V > struct resize_simd;

(2) (parallelism TS v2)

Creates a simd or simd_mask type with a different element type or size. The new type likely uses an ABI tag type different from V::abi_type.

1) Changes the element type to T and keeps the size unchanged.

2) Changes the size to N and keeps the element type unchanged.

[edit] Template parameters T - the new element type; an arithmetic type other than bool N - the new number of elements V - a simd or simd_mask type [edit] Member types Name Definition type simd or simd_mask type with a different element type (1) or size (2) [edit] Helper types

template< class T, class V > using rebind_simd_t = typename rebind_simd<T, V>::type;

(parallelism TS v2)

template< int N, class V > using resize_simd_t = typename resize_simd<N, V>::type;

(parallelism TS v2) [edit] Example

#include <experimental/simd>
#include <iostream>
 
namespace stdx = std::experimental;
using floatv = stdx::native_simd<float>;
 
// use double precision internally
floatv dp(floatv x)
{
    using doublev = stdx::rebind_simd_t<double, floatv>;
    return stdx::static_simd_cast<floatv>(stdx::simd_cast<doublev>(x) - 1.234);
}
 
template<class T>
stdx::resize_simd_t<T::size() / 2, T> partial_reduction(T x)
{
    auto [lo, hi] = stdx::split<stdx::resize_simd_t<T::size() / 2, T>>(x);
    return lo + hi;
}
 
int main() 
{
    floatv x([](auto i) { return 1.234f + std::numeric_limits<float>::epsilon() * i; });
    x = dp(x);
    const auto y = partial_reduction(x);
    for (unsigned i = 0; i < y.size(); ++i)
        std::cout << y[i] << ' ';
    std::cout << '\n';
}

Possible output:

[edit] See also obtains an ABI type for given element type and number of elements
(class template) [edit]

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