count_true

callable_count_true_ eve::count_true = {}

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overloads
   constexpr auto count_true(logical_value auto x)                                      noexcept; // 1
   constexpr auto count_true(top_bits auto t)                                           noexcept; // 1
 
   // Lanes masking
   constexpr auto count_true[conditional_expr auto c](/* any of the above overloads */) noexcept; // 2
   constexpr auto count_true[logical_value auto m](/* any of the above overloads */)    noexcept; // 2
}

Parameters

• x: argument.
• t: top bits.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. The value in the element type of x of the number of non 0 elements.
2. A masked version which return the number of true retained elements.

Parameters

• x : argument.

Return value

The value of the number of non 0 elements is returned.

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
 
  std::cout << "<- wu0                                               = " << wu0 << "\n";
                                                                     
  std::cout << "-> count_true(wu0 <= maximum(wu0)/2)                 = " << eve::count_true(wu0 <= eve::maximum(wu0)/2) << "\n";
  std::cout << "-> count_true[ignore_last(2)](wu0 <= maximum(wu0)/2) = " << eve::count_true[eve::ignore_last(2)](wu0 <= eve::maximum(wu0)/2) << "\n";
}

Semantic Modifiers

• Masked Call

  The call eve::$name$[mask](x, ...) provides a masked version of `count_true which count the non masked non zero element