Question

Consider the following MIPS code:

add $t3,$t2,$t1

lw $t4,0($t3)

sw $t7,0($t3)

add $t6,$t2,$t8

addi $t3,$t5,4

(a) Draw a general pipeline diagram from CC1 to CC5

(b) Can you identify the type of hazard in pipeline for executing the code?

(c) What is the solution to the hazard? If NOP (noop or bubbles) have to be inserted to avoid hazard, where will you put them?

(d) Put the code into the MIPS simulator and observe your findings. You may want to load your own numbers into the registers to see better register contents. (a) Provide contents of registers by printing or using screen print to demonstrate the contents after each instruction execution. (b) Provide your .asm file.

Answer 1

Answer:-

Consider 5 stage pipeline with the following stages:

IF, ID, OF, EX and WB

The type of hazard is RAW (read after write) and CONTROL hazard. Wherever the hazard occurs, NOOP is inserted.