expm1

auto eve::expm1 = functor<expm1_t>

inlineconstexpr

Header file

#include <eve/module/math.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto expm1(floating_value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto expm1[conditional_expr auto c](floating_value auto x) noexcept; // 2
   constexpr auto expm1[logical_value auto m](floating_value auto x)    noexcept; // 2
}

Parameters

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

Return value

1. Returns the elementwise exponential of x-1, with good accuracy, even for small values of x. In particular:
   • If the element is \(\pm0\), \(\pm0\) is returned
   • If the element is \(-\infty\), \(-1\) is returned
   • If the element is \(\infty\), \(\infty\) is returned
   • If the element is a NaN, NaN is returned
2. The operation is performed conditionnaly

Example

// revision 1
#include <eve/module/math.hpp>
#include <iostream>
 
int main()
{
  eve::wide wf = {0.0f, -0.0f, -1.0f, 1.0f, 2.0f,
                  eve::eps(eve::as<float>()), eve::minf(eve::as<float>()), eve::nan(eve::as<float>())};
 
   std::cout << "<- wf                       = " << wf << "\n";
 
   std::cout << "-> expm1(wf)                = " << eve::expm1(wf) << "\n";
   std::cout << "-> expm1[ignore_last(2)](wf)= " << eve::expm1[eve::ignore_last(2)](wf) << "\n";
   std::cout << "-> expm1[wf != 2.0f](wf)    = " << eve::expm1[wf != 2.0f](wf) << "\n";
}