oneosqrteps

eve::oneosqrteps = functor<oneosqrteps_t>

inlineconstexpr

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

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

Parameters

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

Return value

The call eve::oneosqrteps(as<T>()) is semantically equivalent to eve::rec (eve::sqrt (eve::eps (as<T>())))

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
#include <iomanip>
 
using wide_ft = eve::wide<float>;
 
template<typename T>
consteval auto constexpr_oneosqrteps() { return eve::oneosqrteps(eve::as<T>{}); }
 
int main()
{
  wide_ft wxf;
 
  std::cout << "---- simd"  << std::setprecision(9) << std::endl
            << "-> oneosqrteps(as<wide_ft>())          = " << eve::oneosqrteps(eve::as<wide_ft>())            << std::endl
            << "-> oneosqrteps(as(wxf))                = " << eve::oneosqrteps(eve::as(wxf))                  << std::endl
            << "-> upper(oneosqrteps)(as(wxf))         = " << eve::oneosqrteps[eve::upper](eve::as(wxf))     << std::endl
            << "-> rec(eve::sqrt(double(eps((as<float>()))))) = " <<  1.0/(eve::sqrt(double(eve::eps((eve::as<float>())))))  << std::endl
            << "-> lower(oneosqrteps)(as(wxf))         = " << eve::oneosqrteps[eve::lower](eve::as(wxf))  << std::endl;
 
  double       xf;
 
  std::cout << "---- scalar" << std::endl
            << "-> oneosqrteps(as<float>())         = " << eve::oneosqrteps(eve::as(float())) << std::endl
            << "-> oneosqrteps(as<xf))              = " << eve::oneosqrteps(eve::as(xf))      << std::endl;
 
  std::cout << "-> constexpr oneosqrteps            = " << constexpr_oneosqrteps<float>() << std::endl;
 
  return 0;
}