Explain each answer please. Im having a hard time understanding this material :(

Question

Explain each answer please. Im having a hard time understanding this material :(

Consider the following sequence for instructions. or $s1, $s2, #s3 add $s2, $s1, $s4 1w $s1, 0($s2) sub $s1, $s1, $s1 List all RAW hazard for code shown above. Be sure to clearly specify the two instructions and register involved for each hazard. For the datapath shown above, add a minimum number of nops to the given code so that it will operate correctly. No forwarding. Assume that full forwarding was dded to the shown datapath. Add a minimum number of nops to the five coden sod that it will operate correctly. Add nop intructions to the given code to eliminate hazards if ALU-ALU forwarding.

Explanation / Answer

1)
RAW HAZARDS:-
   $s1 ---- in add $s2,$s1,$s4
   $s2------in lw $s1,0($s2)

2)
   or $s1,$s2,$s3
   NOP
   NOP
   NOP
   add $s2,$s1,$s4
   NOP
   NOP
   NOP
   lw $s1,0($s2)
   sub $s1,$s1,$s1

3)
   or $s1,$s2,$s3
   NOP
   add $s2,$s1,$s4
   NOP
   lw $s1,0($s2)
   sub $s1,$s1,$s1
      

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