signnz

auto eve::signnz = functor<signnz_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto signnz(value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto signnz[conditional_expr auto c](value auto x) noexcept; // 2
   constexpr auto signnz[logical_value auto m](value auto x)    noexcept; // 2
 
   // Semantic options
   constexpr auto abs[pedantic](value auto x)                   noexcept; // 3
}

Parameters

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

Return value

1. Computes elementwise the never zero sign of x.
   • If x is positive, 1 is returned.
   • If x is negative, -1 is returned.
2. The operation is performed conditionnaly.
3. same as 1. but returns NaN for NaN input

Note

is_negative and is_positive only look at the sign bit and a NaN has generally unpredicable sign bit.

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};
  eve::wide wi0{0, 1, 2, 3, -1, -2, -3, -4};
  eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
 
  std::cout << "<- wf0                         = " << wf0 << "\n";
  std::cout << "<- wi0                         = " << wi0 << "\n";
  std::cout << "<- wu0                         = " << wu0 << "\n";
                                               
  std::cout << "-> signnz(wf0)                 = " << eve::signnz(wf0) << "\n";
  std::cout << "-> signnz[ignore_last(2)](wf0) = " << eve::signnz[eve::ignore_last(2)](wf0) << "\n";
  std::cout << "-> signnz[wf0 != 0](wf0)       = " << eve::signnz[wf0 != 0](wf0) << "\n";
  std::cout << "-> signnz(wu0)                 = " << eve::signnz(wu0) << "\n";
  std::cout << "-> signnz[ignore_last(2)](wu0) = " << eve::signnz[eve::ignore_last(2)](wu0) << "\n";
  std::cout << "-> signnz[wu0 != 0](wu0)       = " << eve::signnz[wu0 != 0](wu0) << "\n";
  std::cout << "-> signnz(wi0)                 = " << eve::signnz(wi0) << "\n";
  std::cout << "-> signnz[ignore_last(2)](wi0) = " << eve::signnz[eve::ignore_last(2)](wi0) << "\n";
  std::cout << "-> signnz[wi0 != 0](wi0)       = " << eve::signnz[wi0 != 0](wi0) << "\n";
}