try_each_group_position

callable_try_each_group_position_ eve::try_each_group_position = {}

inlineconstexpr

This is useful when one needs to try each element against something. Motivational example could be intersection: try each element from one register against another. Groups allow you to treat N elements as one.

We took the idea for the operation from: "Faster-Than-Native Alternatives for x86 VP2INTERSECT Instructions" by Guillermo Diez-Canas. Link: https://arxiv.org/abs/2112.06342

Parameters

• x : argument.
• fixed<N> : number of elements in group

Return value

kumi::tuple of all results

Example

#include <iostream>
#include <eve/module/core.hpp>
 
using wide_it = eve::wide<std::uint32_t, eve::fixed<4>>;
 
int main()
{
  wide_it x = {1, 2, 3, 4};
 
  std::cout << "---- simd" << '\n'
            << "<- x                                        = " << x << '\n'
            << "-> try_each_group_position(x, eve::lane<1>) = " << eve::try_each_group_position(x, eve::lane<1>) << '\n'
            << "-> try_each_group_position(x, eve::lane<2>) = " << eve::try_each_group_position(x, eve::lane<2>) << '\n';
}