std::experimental::rebind_simd, std::experimental::resize_simd - cppreference.com (original) (raw)

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

[edit] Member types

[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   namespace stdx = std::experimental; using floatv = stdx::native_simd;   // use double precision internally floatv dp(floatv x) { using doublev = stdx::rebind_simd_t<double, floatv>; return stdx::static_simd_cast(stdx::simd_cast(x) - 1.234); }   template 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::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] | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |