rotl

eve::rotl = functor<rotl_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overloads
   constexpr auto rotl(unsigned_value auto x, integral_value auto n)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto rotl[conditional_expr auto c](unsigned_value auto x, integral_value auto n) noexcept; // 3
   constexpr auto rotl[logical_value auto m](unsigned_value auto x, integral_value auto n)    noexcept; // 3
}

Parameters

• x: argument to be rotated.
• n: shift.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. Bitwise rotation of each lane of x by n bits to the left. The types must share the same cardinal or be scalar and if N is the size in bits of the element type of T, all elements of n must belong to the interval: [0, N[ or the result is undefined.
2. The operation is performed conditionnaly

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
  wu0 = ~wu0; 
  eve::wide wu1{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
 
  std::cout << "<- wu0                            = " << wu0 << "\n";
  std::cout << "<- wu1                            = " << wu1 << "\n";
 
  std::cout << "-> rotl(wu0, wu1)                 = " << eve::rotl(wu0, wu1) << "\n";
  std::cout << "-> rotl[ignore_last(2)](wu0, wu1) = " << eve::rotl[eve::ignore_last(2)](wu0, wu1) << "\n";
  std::cout << "-> rotl[wu0 != 0](wu0, wu1)       = " << eve::rotl[wu0 != 0](wu0, wu1) << "\n";
}