bit_floor

eve::bit_floor = {}

inlineconstexpr

If x is not zero, computes the largest integral power of two that is not greater than x.

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   template< eve::value T >
   T bit_floor(T x) noexcept;
}

Parameters

• x : argument.

Return value

• The value of the largest integral power of two that is not greater than x is returned.
• If x is zero returns zero.

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using wide_it = eve::wide<std::uint32_t, eve::fixed<8>>;
 
int main()
{
  wide_it pi = {14, 1, 3, 7, 20, 23000, 0, 27};
 
  std::cout << "---- simd" << '\n'
            << "<- pi            = " << pi << '\n'
            << "-> bit_floor(pi) = " << eve::bit_floor(pi) << '\n';
 
  std::uint32_t xf = 48;
 
  std::cout << "---- scalar" << '\n'
            << "<- xf            = " << xf << '\n'
            << "-> bit_floor(xf) = " << eve::bit_floor(xf) << '\n';
  return 0;
}

Semantic Modifiers

• Masked Call

  The call eve::bit_floor[mask](x, ...) provides a masked version of bit_floor which is equivalent to if_else(mask, bit_floor(x, ...), x)

  Example

  #include <eve/module/core.hpp>
  #include <eve/wide.hpp>
  #include <iostream>
   
  using wide_it = eve::wide<std::uint32_t, eve::fixed<8>>;
   
  int main()
  {
    wide_it pi = {14, 1, 3, 7, 20, 23000, 0, 27};
   
    std::cout << "---- simd" << '\n'
              << "<- pi                    = " << pi << '\n'
              << "-> bit_floor[pi > 4](pi) = " << eve::bit_floor[pi > 4](pi) << '\n';
   
    return 0;
  }