E.V.E
v2023.02.15
 
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◆ ldexp

auto eve::ldexp = functor<ldexp_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto ldexp(floating_value auto x, integral_value N) noexcept; // 1
// Lanes masking
constexpr auto ldexp[conditional_expr auto c](floating_value auto x), integral_value N) noexcept; // 2
constexpr auto ldexp[logical_value auto m](floating_value auto x, integral_value N) noexcept; // 2
// Semantic options
constexpr auto abs[pedantic](floating_value auto x, integral_value N) noexcept; // 3
}
Specifies that a type is a Conditional Expression.
Definition conditional.hpp:28
The concept floating_value<T> is satisfied if and only if T satisfies eve::value and the element type...
Definition value.hpp:116
The concept integral_value<T> is satisfied if and only if T satisfies eve::value and the element type...
Definition value.hpp:51
The concept logical_value<T> is satisfied if and only if T satisfies eve::value and the element type ...
Definition value.hpp:132
constexpr auto abs
elementwise_callable object computing the absolute value of the parameter.
Definition abs.hpp:85
constexpr auto ldexp
strict_elementwise callable computing .
Definition ldexp.hpp:83
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. The value of \(\textstyle x 2^n\) is returned.
  2. The operation is performed conditionnaly.
  3. Takes extra care to handling limit values.
    • If x is \(\pm0\), it is returned, unmodified.
    • If x is \(\pm\infty\), it is returned, unmodified.
    • If n is 0, then x is returned, unmodified.
    • If x is NaN, NaN is returned.

External references

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 wi1{0, 1, 2, 3, 4, 5, 6, 7};
std::cout << "<- wf0 = " << wf0 << "\n";
std::cout << "<- wi0 = " << wi0 << "\n";
std::cout << "<- wi1 = " << wi1 << "\n";
std::cout << "-> ldexp(wf0, wi0) = " << eve::ldexp(wf0, wi0) << "\n";
std::cout << "-> ldexp[ignore_last(2)](wf0, wi0) = " << eve::ldexp[eve::ignore_last(2)](wf0, 2*wi0) << "\n";
std::cout << "-> ldexp[wf0 != 0](wf0, wi0) = " << eve::ldexp[wf0 != 0](wf0, wi0) << "\n";
std::cout << "-> ldexp(wf0, wi1) = " << eve::ldexp(wf0, wi1) << "\n";
std::cout << "-> ldexp[ignore_last(2)](wf0, wi1 = " << eve::ldexp[eve::ignore_last(2)](wf0, wi1) << "\n";
std::cout << "-> ldexp[wi1 != 2](wf0, wi1) = " << eve::ldexp[wi1 != 2](wf0, wi1) << "\n";
}
Conditional expression ignoring the k last lanes from a eve::simd_value.
Definition conditional.hpp:332
Wrapper for SIMD registers.
Definition wide.hpp:70