rshr

eve::rshr = {}

inlineconstexpr

Computes the arithmetic right/left shift operation according to shift sign.

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   template< eve::real_value T , integral_value N >
   T rshr(T x, N n) noexcept;
}

Parameters

• x : argument to be shifted.
• n: shift.

Return value

The value of the arithmetic right/left shift operation according to shift sign is returned

Note

• the call rshr(x, n) is equivalent to if_else(n>0, shl(x, n), shr(x, n)) if x is an simd value.
• 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: ]-N, N[ or the result is undefined.
• The call rshr(x, n) is equivalent to x << n if x is an simd value.

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using iT       = std::int32_t;
using uiT      = std::uint32_t;
using wide_it  = eve::wide<iT, eve::fixed<4>>;
using wide_uit = eve::wide<uiT, eve::fixed<4>>;
 
int main()
{
  wide_uit pi = {100, 200, 2, 3};
  wide_it qi  = {1, -2, 3, -1};
 
  std::cout << "---- simd" << '\n'
            << "<- pi            = " << pi << '\n'
            << "<- qi            = " << qi << '\n'
            << "-> shl(pi, qi)   = " << eve::rshr(pi, qi) << '\n';
 
  uiT xi = 2, yi = 3;
 
  std::cout << "---- scalar" << '\n'
            << "<- xi            = " << xi << '\n'
            << "<- yi            = " << yi << '\n'
            << "-> rshr(xi, yi)  = " << eve::rshr(xi, yi) << '\n';
  return 0;
}

Semantic Modifiers

• Masked Call

  The call eve::rshr[mask](x, ...) provides a masked version of rshr which is equivalent to if_else(mask, rshr(x, ...), x)

  Example

  #include <eve/module/core.hpp>
  #include <eve/wide.hpp>
  #include <iostream>
   
  using iT       = std::int32_t;
  using uiT      = std::uint32_t;
  using wide_it  = eve::wide<iT, eve::fixed<4>>;
  using wide_uit = eve::wide<uiT, eve::fixed<4>>;
   
  int main()
  {
    wide_uit pi = {100, 200, 2, 3};
    wide_it qi  = {1, -2, 3, -1};
   
    std::cout << "---- simd" << '\n'
              << "<- pi                       = " << pi << '\n'
              << "<- qi                       = " << qi << '\n'
              << "-> rshr[pi!= 200](pi, qi)   = " << eve::rshr[pi!= 200](pi, qi) << '\n';
    return 0;
  }