Examine the difficulty of adding a proposed ss instruction to the LEGv8 instruction set, which works as follows: Mem [Reg [Rd] ] Reg [Rn]+immediate; (20 pts) 3. Rd, Rn, #im mediate (Store sum) Which new functional blocks (if any) do we need for this instruction? (4 pts) Which existing functional blocks (if any) require modification? (4 pts) What new datapaths do we need (if any) to support this instruction? (4 pts) What new control unit signals (if any) do we need for this instruction? (4 pts) Modify the complete control and datapath Figure to demonstrate the implementation a. b. c. d. e. of this new instruction. Use Figure 4.23, also shown in Chapter 4 slides, Slide 25. (4 pts)