// suitable for use in `pshufd' or `shufpd', which copies element A
// (0 <= A < 4) of the source to element 0 of the destination, element B to
// element 1, element C to element 2, and element D to element 3.
// suitable for use in `pshufd' or `shufpd', which copies element A
// (0 <= A < 4) of the source to element 0 of the destination, element B to
// element 1, element C to element 2, and element D to element 3.