E.V.E
v2023.02.15
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◆
pow
eve::pow =
functor
<pow_t>
inline
constexpr
Header file
#include <eve/module/math.hpp>
Callable Signatures
namespace
eve
{
// Regular overload
constexpr
auto
pow
(
value
auto
x,
value
auto
y)
noexcept
;
// 1
// Lanes masking
constexpr
auto
pow
[
conditional_expr
auto
c](
value
auto
x,
value
auto
y)
noexcept
;
// 2
constexpr
auto
pow
[
logical_value
auto
m](
value
auto
x,
value
auto
y)
noexcept
;
// 2
// Semantic options
constexpr
auto
pow
[raw](
value
auto
x,
value
auto
y)
noexcept
;
// 3
}
eve::conditional_expr
Specifies that a type is a Conditional Expression.
Definition:
conditional.hpp:27
eve::logical_value
The concept logical_value<T> is satisfied if and only if T satisfies eve::value and the element type ...
Definition:
value.hpp:107
eve::value
The concept value<T> is satisfied if and only if T satisfies either eve::scalar_value or eve::simd_va...
Definition:
value.hpp:33
eve::pow
constexpr auto pow
Callable object computing the pow operation .
Definition:
pow.hpp:119
eve
EVE Main Namespace.
Definition:
abi.hpp:18
Parameters
Return value
Returns
elementwise
\(x^y\). In particular we have (IEC 60559):
pow(+0, y), where y is a negative odd integer, returns \(+\infty\)
pow(-0, y), where y is a negative odd integer, returns \(-\infty\)
pow( \(\pm0\), y), where y is negative, finite, and is an even integer or a non-integer, returns \(+\infty\)
pow( \(\pm0\), \(-\infty\)) returns \(+\infty\)
pow(+0, y), where y is a positive odd integer, returns +0
pow(-0, y), where y is a positive odd integer, returns -0
pow( \(\pm0\), y), where y is positive non-integer or a positive even integer, returns +0
pow(-1, \(\pm\infty\)) returns 1
pow(+1, y) returns 1 for any y, even when y is NaN
pow(x, \(\pm0\)) returns 1 for any x, even when x is NaN
pow(x, y)
returns NaN if x is finite and less than 0 and y is finite and non-integer.
pow(x, \(-\infty\)) returns \(+\infty\) for any |x|<1
pow(x, \(-\infty\)) returns +0 for any |x|>1
pow(x, \(+\infty\)) returns +0 for any |x|<1
pow(x, \(+\infty\)) returns \(+\infty\) for any |x|>1
pow( \(-\infty\), y) returns -0 if y is a negative odd integer
pow( \(-\infty\), y) returns +0 if y is a negative non-integer or even integer
pow( \(-\infty\), y) returns \(-\infty\) if y is a positive odd integer
pow( \(-\infty\), y) returns \(+\infty\) if y is a positive non-integer or even integer
pow( \(+\infty\), y) returns +0 for any y less than 0
pow( \(+\infty\), y) returns \(+\infty\) for any y greater than 0
except where specified above, if any argument is NaN, NaN is returned
The operation is performed conditionnaly
faster but less accurate call
Example
// revision 1
#include <eve/module/math.hpp>
#include <iostream>
#include <cmath>
int
main()
{
eve::wide
qf = {0.0f, 3.0f, -4.0f, 2.0f, 2.0f,
eve::inf
(
eve::as<float>
()),
eve::minf
(
eve::as<float>
()),
eve::nan
(
eve::as<float>
())};
eve::wide
pf = {4.0f, 1.0f, -1.0f, 0.5f, 0.0f, 0.0f, -0.0f, 2.5f};
std::cout <<
"<- pf = "
<< pf <<
"\n"
;
std::cout <<
"<- qf = "
<< qf <<
"\n"
;
std::cout <<
"-> pow(pf, qf) = "
<<
eve::pow
(pf, qf) <<
"\n"
;
std::cout <<
"-> pow[ignore_last(2)](pf, qf)= "
<<
eve::pow
[
eve::ignore_last
(2)](pf, qf) <<
"\n"
;
std::cout <<
"-> pow[qf > 0.0f](pf, qf) = "
<<
eve::pow
[qf > 0.0f](pf, qf) <<
"\n"
;
std::cout <<
"-> pow[raw](pf, qf) = "
<<
eve::pow
[eve::raw](pf, qf) <<
"\n"
;
}
eve::nan
constexpr auto nan
Computes the IEEE quiet NaN constant.
Definition:
nan.hpp:67
eve::minf
constexpr auto minf
Computes the -infinity ieee value.
Definition:
minf.hpp:66
eve::inf
constexpr auto inf
Computes the infinity ieee value.
Definition:
inf.hpp:66
eve::as
Lightweight type-wrapper.
Definition:
as.hpp:29
eve::ignore_last
Conditional expression ignoring the k last lanes from a eve::simd_value.
Definition:
conditional.hpp:304
eve::wide
Wrapper for SIMD registers.
Definition:
wide.hpp:71
eve