E.V.E
v2023.02.15
 
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◆ floor

auto eve::floor = functor<floor_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overload
constexpr auto floor(value auto x) noexcept; // 1
// Lanes masking
constexpr auto floor[conditional_expr auto c](value auto x) noexcept; // 2
constexpr auto floor[logical_value auto m](value auto x) noexcept; // 2
// Semantic options
constexpr auto floor[almost = tol](floating_value auto x) noexcept; // 3
constexpr auto floor[almost](floating_value auto x) noexcept; // 4
}
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
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 floor
elementwise_callable object computing the largest integer not greater than the input.
Definition floor.hpp:94
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

1. The largest integer not greater than `x`.
   The standard proposes 4 rounding modes namely: `FE_TONEAREST`, `FE_DOWNWARD`, `FE_UPWARD`,
   `FE_TOWARDZERO`. This function object implements the `FE_DOWNWARD` version.
2. [The operation is performed conditionnaly](@ref conditional).
3. `almost` allows a fuzzy interpretation of ceil associated to a scalar tolerance.
    - with an integral value `tol`: computes the floor of the next nth
      representable value in the `x` type.
    - with a floating  value `tol`: computes the floor with a tolerance `tol`
      using Hagerty's FL5 function.
4. with no tolerance value, the call is equivalent to `ceil[tolerance = 3*eps(as(x))(x)`

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 << "-> floor(wf0) = " << eve::floor(wf0) << "\n";
std::cout << "-> floor[ignore_last(2)](wf0) = " << eve::floor[eve::ignore_last(2)](wf0) << "\n";
std::cout << "-> floor[wf0 != 0](wf0) = " << eve::floor[wf0 != 0](wf0) << "\n";
std::cout << "-> floor[almost](wf0) = " << eve::floor[eve::almost](wf0) << "\n";
std::cout << "-> floor(wu0) = " << eve::floor(wu0) << "\n";
std::cout << "-> floor[ignore_last(2)](wu0) = " << eve::floor[eve::ignore_last(2)](wu0) << "\n";
std::cout << "-> floor[wu0 != 0](wu0) = " << eve::floor[wu0 != 0](wu0) << "\n";
std::cout << "-> floor(wi0) = " << eve::floor(wi0) << "\n";
std::cout << "-> floor[ignore_last(2)](wi0) = " << eve::floor[eve::ignore_last(2)](wi0) << "\n";
std::cout << "-> floor[wi0 != 0](wi0) = " << eve::floor[wi0 != 0](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