function shl(arg: unsigned; count: unsigned) return unsigned;
function shl(arg: signed; count: unsigned) return signed;
function shr(arg: unsigned; count: unsigned) return unsigned;
function shr(arg: signed; count: unsigned) return signed;
The bit shifting operations shift left (shl) and shift right (shr)
are defined on the unsigned and signed types.
They shift arg in the given direction by count places.
If all you really need to do is shift by a fixed number of places, you can do it by simple array subscripting.