bit_and

auto eve::bit_and = functor<bit_and_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overloads
   constexpr auto bit_and(value auto x, value auto ... xs)                          noexcept; // 1
   constexpr auto bit_and(eve::non_empty_product_type auto const& tup)             noexcept; // 2
 
   // Lanes masking
   constexpr auto bit_and[conditional_expr auto c](/*any of the above overloads*/)  noexcept; // 3
   constexpr auto bit_and[logical_value auto m](/*any of the above overloads*/)     noexcept; // 3
}

Parameters

• x: first argument.
• xs...: other arguments.
• tup: non empty tuple of arguments.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. The value of the bitwise AND of its arguments converted to the common bit_value of the arguments
2. equivalent to the call on the elements of the tuple.
3. The operation is performed conditionnaly. This is only supported when all parameters share the same number of lanes or are scalars.

Note

Although the infix notation with & is supported for two parameters, the & operator on standard scalar types is the original one and so can lead to automatic promotion. Moreover, and due to C++ limitations is not available for floating point scalar entries.

External reference

• Wikipedia

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 << "-> bit_and(wf0, wf1)                 = " << eve::bit_and(wf0, wf1) << "\n";
  std::cout << "-> bit_and[ignore_last(2)](wf0, wf1) = " << eve::bit_and[eve::ignore_last(2)](wf0, wf1) << "\n";
  std::cout << "-> bit_and[wf0 != 0](wf0, wf1)       = " << eve::bit_and[wf0 != 0](wf0, wf1) << "\n";
  std::cout << "-> bit_and(wu0, wu1)                 = " << eve::bit_and(wu0, wu1) << "\n";
  std::cout << "-> bit_and(wi0, wi1)                 = " << eve::bit_and(wi0, wi1) << "\n";
  std::cout << "-> bit_and(2.,1.,2.,3.,-3.,-4.,-6.0) = " << eve::bit_and(2.0, 1.0, 2.0, 3.0, -3.0, -4., -6.0) << "\n";
  std::cout << "->:bit_and(2.1,2.,2.,2.,2.,2.,2.)    = " << eve::bit_and(2.1,2.,2.,2.,2.,2.,2.) << "\n";
}