is_pow2

auto eve::is_pow2 = functor<is_pow2_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   constexpr auto is_pow2(integral_value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto is_pow2[conditional_expr auto c](integral_value auto x) noexcept; // 2
   constexpr auto is_pow2[logical_value auto m](integral_value auto x)    noexcept; // 2
}

Parameters

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

Return value

1. returns true if and only if x is an integral power of two.
2. The operation is performed conditionnaly.

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  eve::wide wi0{0, 1, 2, 3, -1, -2, -3, -4};
 
  std::cout << "<- wi0                          = " << wi0 << "\n";
                                                
  std::cout << "-> is_pow2(wi0)                 = " << eve::is_pow2(wi0) << "\n";
  std::cout << "-> is_pow2[ignore_last(2)](wi0) = " << eve::is_pow2[eve::ignore_last(2)](wi0) << "\n";
  std::cout << "-> is_pow2[wi0 != 0](wi0)       = " << eve::is_pow2[wi0 != 0](wi0) << "\n";
}