bitofsign

eve::bitofsign = {}

inlineconstexpr

Computes the value in the input type of the bit of sign.

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   template< eve::value T >
   T bitofsign(T x) noexcept;
}

Parameters

• x : argument.

Return value

The value of the bit of sign is returned.

Note

• bitofsign does NOT return a logical value
• In particular, take care that for floating real values bitofsign does NOT return a logical value that can be tested, but mzero(as(x)) if x is negative and zero(as(x)) if x is positive, which both satisfy the eve::is_eqz predicate.
• If you want to test if the bit of sign is set eve::is_negative is the right function to call.

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using wide_ft = eve::wide<float, eve::fixed<4>>;
 
int main()
{
  wide_ft pf = {-1.0f, 0.0f, 3.0f, -0.0f};
 
  std::cout << "---- simd" << '\n'
            << "<- pf            = " << pf << '\n'
            << "-> bitofsign(pf) = " << eve::bitofsign(pf) << '\n';
 
  float        xf = -32768.0f;
 
  std::cout << "---- scalar" << '\n'
            << "<- xf            = " << xf << '\n'
            << "-> bitofsign(xf) = " << eve::bitofsign(xf) << '\n';
  return 0;
}