E.V.E
v2023.02.15
 
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◆ abs

auto eve::abs = functor<abs_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto abs(value auto x) noexcept; // 1
// Lanes masking
constexpr auto abs[conditional_expr auto c](value auto x) noexcept; // 2
constexpr auto abs[logical_value auto m](value auto x) noexcept; // 2
// Semantic options
constexpr auto abs[saturated](value auto x) noexcept; // 3
}
Specifies that a type is a Conditional Expression.
Definition conditional.hpp:28
The concept logical_value<T> is satisfied if and only if T satisfies eve::value and the element type ...
Definition value.hpp:132
The concept value<T> is satisfied if and only if T satisfies either eve::scalar_value or eve::simd_va...
Definition value.hpp:34
constexpr auto abs
elementwise_callable object computing the absolute value of the parameter.
Definition abs.hpp:85
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. The absolute value of x if it is representable.
  2. The operation is performed conditionnaly.
  3. The saturated absolute value of x. More specifically, for signed integral, abs[saturated](valmin(as<T>{})) returns eve:valmax(as<T>{}))
Note
The absolute value of x is always representable except for The minimum value of integral signed values. In that case, contrarily to the standard, the result is not undefined behaviour, but just incorrect. In this case, eve::abs(valmin) returns valmin.
Warning
abs is also a standard library function name and there possibly exists a C macro version which may be called instead of the EVE version.
To avoid confusion, use the eve::abs notation.

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 wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
std::cout << "<- wf0 = " << wf0 << "\n";
std::cout << "<- wi0 = " << wi0 << "\n";
std::cout << "<- wu0 = " << wu0 << "\n";
std::cout << "-> abs(wf0) = " << eve::abs(wf0) << "\n";
std::cout << "-> abs[ignore_last(2)](wf0) = " << eve::abs[eve::ignore_last(2)](wf0) << "\n";
std::cout << "-> abs[wf0 != 0](wf0) = " << eve::abs[wf0 != 0](wf0) << "\n";
std::cout << "-> abs(wu0) = " << eve::abs(wu0) << "\n";
std::cout << "-> abs[ignore_last(2)](wu0) = " << eve::abs[eve::ignore_last(2)](wu0) << "\n";
std::cout << "-> abs[wu0 != 0](wu0) = " << eve::abs[wu0 != 0](wu0) << "\n";
std::cout << "-> abs[saturated](wu0) = " << eve::abs[eve::saturated](wu0) << "\n";
std::cout << "-> abs(wi0) = " << eve::abs(wi0) << "\n";
std::cout << "-> abs[ignore_last(2)](wi0) = " << eve::abs[eve::ignore_last(2)](wi0) << "\n";
std::cout << "-> abs[wi0 != 0](wi0) = " << eve::abs[wi0 != 0](wi0) << "\n";
std::cout << "-> abs[saturated](wi0) = " << eve::abs[eve::saturated](wi0) << "\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