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Computers and Technology, 28.05.2021 16:40 Geo777
Consider the following sequence o instructions, and assume that it is executed on a 5-stage pipelined data path:
Add r5,r2,r1 #l1
lw r3, 4(r5) #l2
Or r3,r5,r3 #l3
lw r2 0(r2) #l4
Sw r3, 0(r5) #l5
a. List the read-after-write (current instruction is reading certain registers which haven't been written back yet) data dependencies. As an example, 2 on 1 (r5) shows instruction 2 has data dependency on instruction 1 since it is reading register År5.
b. Assume the 5-stage MIPS pipeline with no forwarding, and each stage takes 1 cycle. Instead of inserting NOPs, you let the processor stall on hazards. How many times does the processor stall? What is the total number of stall cycles?
c. What is the execution time (in cycles) for the whole program? Sketch a diagram to explain your answer.
d. Assume the 5-stage MIPS pipeline with full forwarding. Insert NOPs to eliminate the hazards.
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Consider the following sequence o instructions, and assume that it is executed on a 5-stage pipeline...
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