E.V.E
v2023.02.15
 
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◆ is_negative

auto eve::is_negative = functor<is_negative_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto is_negative(value auto x) noexcept; // 1
// Lanes masking
constexpr auto is_negative[conditional_expr auto c](value auto x) noexcept; // 2
constexpr auto is_negative[logical_value auto m](value auto x) noexcept; // 2
// Semantic options
constexpr auto is_negative[pedantic](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 is_negative
elementwise callable returning a logical true if and only if the element value is signed and has its ...
Definition is_negative.hpp:84
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. For signed types The call is_negative(x) returns true if and only if the bit of sign (most significant bit) is set. Of course the result on a NaN input is generally out of control.
  2. The operation is performed conditionnaly.
  3. with this option a NaN input always return false.
Note
this function coincides with is_ltz on integral real values, but for floating values T, is_negative(mzero<T>) is true and if n is a Nan the result depends of the bit of sign of n which can be out of control although not undefined.

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, -nan, nan};
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 << "-> is_negative(wf0) = " << eve::is_negative(wf0) << "\n";
std::cout << "-> is_negative[pedantic](wf0) = " << eve::is_negative[eve::pedantic](wf0) << "\n";
std::cout << "-> is_negative[ignore_last(2)](wf0) = " << eve::is_negative[eve::ignore_last(2)](wf0) << "\n";
std::cout << "-> is_negative[wf0 != 0](wf0) = " << eve::is_negative[wf0 != 0](wf0) << "\n";
std::cout << "-> is_negative(wu0) = " << eve::is_negative(wu0) << "\n";
std::cout << "-> is_negative[ignore_last(2)](wu0) = " << eve::is_negative[eve::ignore_last(2)](wu0) << "\n";
std::cout << "-> is_negative[wu0 != 0](wu0) = " << eve::is_negative[wu0 != 0](wu0) << "\n";
std::cout << "-> is_negative(wi0) = " << eve::is_negative(wi0) << "\n";
std::cout << "-> is_negative[ignore_last(2)](wi0) = " << eve::is_negative[eve::ignore_last(2)](wi0) << "\n";
std::cout << "-> is_negative[wi0 != 0](wi0) = " << eve::is_negative[wi0 != 0](wi0) << "\n";
}
constexpr auto nan
Computes the IEEE quiet NaN constant.
Definition nan.hpp:67
Lightweight type-wrapper.
Definition as.hpp:29
Conditional expression ignoring the k last lanes from a eve::simd_value.
Definition conditional.hpp:332
Wrapper for SIMD registers.
Definition wide.hpp:70