HW: Single Cycle Datapath
 
    - Consider adding support for an addi (add immediate)
    instruction to the single-cycle datapath described in class and in
    the book.  Add any necessary datapaths and control signals to the
    single-cycle datapath diagram
    provided
    here (pdf).
    (Or you can use modify these PowerPoint slides if you want.)
    
- Add the bne (branch if not equal) instruction to
    another copy of the diagram.
    
- Add the jal (jump and link) instruction to
    another copy of the diagram.