E.V.E
v2023.02.15
 
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◆ mantissa

auto eve::mantissa = functor<mantissa_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto mantissa(floating_value auto x) noexcept; // 1
// Lanes masking
constexpr auto mantissa[conditional_expr auto c](floating_value auto x) noexcept; // 2
constexpr auto mantissa[logical_value auto m](floating_value auto x) noexcept; // 2
// Semantic options
constexpr auto mantissa[raw](floating_value auto x) 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 logical_value<T> is satisfied if and only if T satisfies eve::value and the element type ...
Definition value.hpp:132
constexpr auto mantissa
elementwise_callable object computing the IEEE mantissa of the floating value.
Definition mantissa.hpp:74
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. The value of the IEEE mantissa is returned. In particular:
    • nan returns nan
    • zero returns zero
  2. The operation is performed conditionnaly.
  3. The results for zero and nan are unspecified.
Note
The exponent \(e\) and mantissa \(m\) of a floating point entry \(x\) are related by \(x = m\times 2^e\), with \(|m| \in \{0, nan\} \cup [1, 2[\).

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};
std::cout << "<- wf0 = " << wf0 << "\n";
std::cout << "-> mantissa(wf0) = " << eve::mantissa(wf0) << "\n";
std::cout << "-> mantissa[ignore_last(2)](wf0) = " << eve::mantissa[eve::ignore_last(2)](wf0) << "\n";
std::cout << "-> mantissa[wf0 != 0](wf0) = " << eve::mantissa[wf0 != 0](wf0) << "\n";
std::cout << "-> mantissa[raw](wf0) = " << eve::mantissa[eve::raw](wf0) << "\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