E.V.E
v2023.02.15
 
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◆ is_less

auto eve::is_less = functor<is_less_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto is_less(value auto x, value auto y) noexcept; // 1
// Lanes masking
constexpr auto is_less[conditional_expr auto c](value auto x, value auto y) noexcept; // 2
constexpr auto is_less[logical_value auto m](value auto x, value auto y) noexcept; // 2
// Semantic option
constexpr auto is_less[definitely](/*any of the above overloads*/) noexcept; // 3
constexpr auto is_less[definitely = tol](/*any of the above overloads*/) 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_less
elementwise callable returning a logical true if and only if the element value of the first parameter...
Definition is_less.hpp:91
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. The call eve::is_less(x,y) is semantically equivalent to x < y:
  2. The operation is performed conditionnaly.
  3. The expression is_greater[definitely = tol](x, y) where x and y must be floating point values, evaluates to true if and only if x is definitely greater than y. This means that:
    • if tol is a floating value then \(x < y - \mbox{tol}\cdot \max(|x|, |y|)\)
    • if tol is a positive integral value then \(x < \mbox{prev}(y, \mbox{tol})\);
    • if tol is omitted then the tolerance tol default to 3*eps(as(x)).

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 wf1{0.0, -4.0, 1.0, -1.0, 2.0, -2.0, 3.0, -3.0};
eve::wide wi0{0, 1, 2, 3, -1, -2, -3, -4};
eve::wide wi1{0, -4, 1, -1, 2, -2, 3, -3};
eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
eve::wide wu1{7u, 6u, 5u, 4u, 3u, 2u, 1u, 0u};
std::cout << "<- wf0 = " << wf0 << "\n";
std::cout << "<- wf1 = " << wf1 << "\n";
std::cout << "<- wi0 = " << wi0 << "\n";
std::cout << "<- wi1 = " << wi1 << "\n";
std::cout << "<- wu0 = " << wu0 << "\n";
std::cout << "<- wu1 = " << wu1 << "\n";
std::cout << "-> is_less(wf0, wf1) = " << eve::is_less(wf0, wf1) << "\n";
std::cout << "-> is_less[ignore_last(2)](wf0, wf1) = " << eve::is_less[eve::ignore_last(2)](wf0, wf1) << "\n";
std::cout << "-> is_less[wf0 != 0](wf0, wf1) = " << eve::is_less[wf0 != 0](wf0, wf1) << "\n";
std::cout << "-> is_less[definitely](wf0, wf1) = " << eve::is_less[eve::definitely](wf0, wf1) << "\n";
std::cout << "-> is_less(wu0, wu1) = " << eve::is_less(wu0, wu1) << "\n";
std::cout << "-> is_less[ignore_last(2)](wu0, wu1) = " << eve::is_less[eve::ignore_last(2)](wu0, wu1) << "\n";
std::cout << "-> is_less[wu0 != 0](wu0, wu1) = " << eve::is_less[wu0 != 0](wu0, wu1) << "\n";
std::cout << "-> is_less(wi0, wi1) = " << eve::is_less(wi0, wi1) << "\n";
std::cout << "-> is_less[ignore_last(2)](wi0, wi1) = " << eve::is_less[eve::ignore_last(2)](wi0, wi1) << "\n";
std::cout << "-> is_less[wi0 != 0](wi0, wi1) = " << eve::is_less[wi0 != 0](wi0, 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