Examine the difficulty of adding a proposed swap Rd, Rn instruction to the LEGv8

Question

Examine the difficulty of adding a proposed swap Rd, Rn instruction to the LEGv8 instruction
set, which works as follows: Reg[Rd] = Reg[Rn]; Reg[Rn] = Reg[Rd]; (20 pts)

a. Which new functional blocks (if any) do we need for this instruction? (4 pts)

b. Which existing functional blocks (if any) require modification? (4 pts)

c. What new datapaths do we need (if any) to support this instruction? (4 pts)

d. What new control unit signals (if any) do we need for this instruction? (4 pts)

e. Modify the complete control and datapath Figure to demonstrate the implementation
of this new instruction. Use Figure 4.23, also shown in Chapter 4 slides, Slide 25. (4 pts)

Examine the difficulty of adding a proposed swap Rd, Rn instruction to the LEGv8 instruction set, which works as follows: Reg [Rd] = Reg [Rn] ; Reg [Rn] Reg [Rd] ; (20 pts) 2. 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) a. b. c. d wnat ew contod una e oru Modify the complete control and datapath Figure to demonstrate the implementation of this new instruction. Use Figure 4.23, also shown in Chapter 4 slides, Slide 25. (4 pts) e.

Explanation / Answer

The Instruction set for the respective Interpretation:-

(a)

The process of the load with increment which can be done in two ways:-

(b)

(c)

The datapath parts and control signals needed to implement the TAL(Tump and Link) Instruction in a single cycle datapath.

(d)

Interprepation Set:

ADDI Rs,Ra, Imm12: Reg[Rd] = Reg[Rn].
ADDS Rb, Ra, Rz: Reg[Ra] = Reg[Rs] + Reg[Rb].
B Imm26: PC = PC

B.LT Imm19: PC = PC.

BL Imm26: X30 = PC + 4 , PC = PC

BR Rd: PC = Reg[Rd].

CBZ Rt, Imm19: If (Reg[Rt] == 0) PC = PC

LDUR Rt, [Rn, #Imm9]: Reg[Rt] = Mem[Reg[Rn]

STUR Rt, [Rn, #Imm9]: Mem[Reg[Rn] +
SUBS Rd, Rn, Rm: Reg[Rd] = Reg[Rn] - Reg[Rm].

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