rsqrt

auto eve::rsqrt = functor<rsqrt_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto rsqrt(floating_value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto rsqrt[conditional_expr auto c](floating_value auto x) noexcept; // 2
   constexpr auto rsqrt[logical_value auto m](floating_value auto x)    noexcept; // 2
 
   // Semantic options
   constexpr auto rsqrt[raw](floating_value auto x)                     noexcept; // 3
}

Parameters

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

Return value

1. value containing the elementwise inverse of the square root of x.
2. The operation is performed conditionnaly.
3. call a proper system intrinsic if one exists, but with possibly very poor accuracy in return. Otherwise it uses the regular call.

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  eve::wide wf0{0.0, 1.0, 2.0, 3.0, -1.0, -2.0, -3.0, -4.0};
 
  std::cout << "<- wf0                        = " << wf0 << "\n";
                                              
  std::cout << "-> rsqrt(wf0)                 = " << eve::rsqrt(wf0) << "\n";
  std::cout << "-> rsqrt[ignore_last(2)](wf0) = " << eve::rsqrt[eve::ignore_last(2)](wf0) << "\n";
  std::cout << "-> rsqrt[wf0 != 0](wf0)       = " << eve::rsqrt[wf0 != 0](wf0) << "\n";
  std::cout << "-> rsqrt[raw](wf0)            = " << eve::rsqrt[eve::raw](wf0) << "\n";
}