rshl

auto eve::rshl = functor<rshl_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overloads
   constexpr auto rshl(integral_value auto x, integral_value auto n)                          noexcept; // 2
 
   // Lanes masking
   constexpr auto rshl[conditional_expr auto c](integral_value auto x, integral_value auto n) noexcept; // 3
   constexpr auto rshl[logical_value auto m](integral_value auto x, integral_value auto n)    noexcept; // 3
}

Parameters

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

Return value

1. The value of the arithmetic left/right shift operation according to shift sign is returned. This is equivalent to if_else(n>0, shl(x, n), shr(x, -n)) If Nis the size in bits of the element type of x, all elements of n must belong to the interval: ]-N, 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 wi0{0, 1, 2, 3, -1, -2, -3, -4};
  eve::wide wi1{0, -4, 1, -1, 2, -2, 3, -3};
  eve::wide wi2{1024, -4, 1, -1, 2, -2, 3, -3};
 
  std::cout << "<- wi0                            = " << wi0 << "\n";
  std::cout << "<- wi1                            = " << wi1 << "\n";
                                                  
  std::cout << "-> rshl(wi0, wi1)                 = " << eve::rshl(wi0, wi1) << "\n";
  std::cout << "-> rshl[ignore_last(2)](wi0, wi1) = " << eve::rshl[eve::ignore_last(2)](wi0, wi1) << "\n";
  std::cout << "-> rshl[wi0 != 0](wi0, wi1)       = " << eve::rshl[wi0 != 0](wi0, wi1) << "\n";
  std::cout << "-> rshl[wi2 < 32](wi0, wi2)       = " << eve::rshl[wi2 < 32](wi0, wi2) << "\n";
}