Callable object computing the base 2 logarithm: \(\log_2 x\).
Defined in Header
#include <eve/module/math.hpp>
{
template< eve::floating_value T >
template< eve::floating_value T >
}
constexpr callable_log2_ log2
Callable object computing the base 2 logarithm: .
Definition: log2.hpp:79
Definition: all_of.hpp:22
SIMD-compatible representation of complex numbers.
Definition: complex.hpp:40
Parameters
Return value
- Returns the elementwise the base 2 logarithm of
x
In particular, for floating inputs:
- If the element is \(\pm0\), \(-\infty\) is returned.
- If the element is \(1\), \(+0\) is returned.
- If the element is \(\infty\), \(\infty\) is returned.
- If the element is less than 0,
NaN
is returned.
- Returns elementwise the base 2 logarithm of the input The behavior of this function is equivalent to
eve::log(z)/eve::log_2(eve::as(x))
.
Real version
#include <eve/module/math.hpp>
#include <eve/wide.hpp>
#include <iostream>
int main()
{
wide_ft pf = {0.0f, -0.0f, -1.0f, 1.0f, 2.0f,
std::cout << "---- simd" << '\n'
<< "<- pf = " << pf << '\n'
;
float xf = 1.0f;
std::cout << "---- scalar" << '\n'
<< "<- xf = " << xf << '\n'
<<
"-> log2(xf) = " <<
eve::log2(xf) <<
'\n';
return 0;
}
constexpr callable_nan_ nan
Computes the IEEE NaN constant.
Definition: nan.hpp:53
constexpr callable_inf_ inf
Computes the infinity ieee value.
Definition: inf.hpp:58
Lightweight type-wrapper.
Definition: as.hpp:29
Wrapper for SIMD registers.
Definition: wide.hpp:65
Complex version
#include <eve/module/complex.hpp>
#include <eve/wide.hpp>
#include <iostream>
int main()
{
wide_ft ref = { 0.0f, 1.0f, -1.0f, 0.5f};
wide_ft imf = { 2.0f , -1.0, -5.0, 0.0};
auto z = eve::as_complex_t<wide_ft>(ref, imf);
std::cout
<< "---- simd" << std::endl
<< "<- z = " << z << std::endl
<<
"-> log2(z) = " <<
eve::log2(z) << std::endl;
return 0;
}