Part b

A. Explain why forwarding is done from MA-WB Buffer (shown in the Fig. 1) in case of the instruction sequence in 2.b. (iii) whereas it is done from Ex-MA Buffer in case of the following sequence: add $t0, $t0, $tl; add $t0, $t0, $t2; add $t0, $t0, $t3 b. Using MIPS-like pseudo-code, present the logic for pipeline stalling while scheduling the second instruction in Q.2.b iii). Discuss how pipeline stalling is done. c. Explain with a state diagram the 2-bit memory scheme (4 state) for branch taking that is useful in ease of nested loops