E.V.E
v2023.02.15
 
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◆ bit_reverse

auto eve::bit_reverse = functor<bit_reverse_t>
inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
// Regular overloads
constexpr auto bit_reverse(unsigned_value auto x) noexcept; // 1
constexpr auto bit_reverse(unsigned_value auto x integral_scalar_value n) noexcept; // 2
// Lanes masking
constexpr auto bit_reverse[conditional_expr auto c](/*any of the above overloads*/) noexcept; // 3
constexpr auto bit_reverse[logical_value auto m](/*any of the above overloads*/) noexcept; // 3
}
Specifies that a type is a Conditional Expression.
Definition conditional.hpp:28
Specify that a type represents an integral scalar value. The concept integral_scalar_value<T> is sati...
Definition vectorizable.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 unsigned_value<T> is satisfied if and only if T satisfies eve::value and the element type...
Definition value.hpp:84
constexpr auto bit_reverse
strict_elementwise_callable object reversing the bit order.
Definition bit_reverse.hpp:84
EVE Main Namespace.
Definition abi.hpp:18

Parameters

Return value

  1. The values of the of the parameter are returned with bits in reversed order.
  2. if n is present :
    • if n == 0 the call returns x
    • if 2*n is greater or equal to the size of the element type of x, the call is identical to reverse(x).
    • otherwise the first n bits and the last n bits of each element of x are swapped in reverse order and the central remaining bits are unchanged.
  3. The operation is performed conditionnaly.

Example

// revision 1
#include <eve/module/core.hpp>
#include <iostream>
int main()
{
eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
std::cout << "<- wu0 = " << wu0 << "\n";
std::cout << "-> bit_reverse(wu0) = " << eve::bit_reverse(wu0) << "\n";
std::cout << "-> bit_reverse(wu0, 3) = " << eve::bit_reverse(wu0, 3) << "\n";
std::cout << "-> bit_reverse[ignore_last(2)](wu0) = " << eve::bit_reverse[eve::ignore_last(2)](wu0) << "\n";
std::cout << "-> bit_reverse[wu0 != 2u](wu0) = " << eve::bit_reverse[wu0 != 2u](wu0) << "\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