mantissamask

auto eve::mantissamask = functor<mantissamask_t>

inlineconstexpr

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
  template<eve::floating_value T> constexpr eve::as_uinteger_t<T> mantissamask(as<T> x);
}

Parameters

• x : Type wrapper instance embedding the type of the constant.

Return value

The call eve::mantissamask(as<T>()) returns elementwise, the integral mask to extract the mantissa bits of an ieee floating value. The element values are:

• 0x807FFFFFU if the element type is float
• 0x800FFFFFFFFFFFFFULL if the element type is double

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using wide_ft = eve::wide<float>;
 
template<typename T>
consteval auto constexpr_mantissamask() { return eve::mantissamask(eve::as<T>{}); }
 
int main()
{
  wide_ft wxf;
 
  std::cout << "---- simd"  << std::endl
            << "-> mantissamask(as<wide_ft>())  = " << eve::mantissamask(eve::as<wide_ft>()) << std::endl
            << "-> mantissamask(as(wxf))        = " << eve::mantissamask(eve::as(wxf))       << std::endl;
 
  double       xf;
 
  std::cout << "---- scalar" << std::endl
            << "-> mantissamask(as<float>())         = " << eve::mantissamask(eve::as(float())) << std::endl
            << "-> mantissamask(as<xf))              = " << eve::mantissamask(eve::as(xf)) << std::endl;
 
  std::cout << "-> constexpr mantissamask            = " << constexpr_mantissamask<float>() << std::endl;
 
  return 0;
}