Question

If we use internal data forwarding to speed up the performance of a CPU (R1, R2 and R3 are register and M[100] is a memory reference), then the sequence of operations

R1 $\to$ M[100]

M[100] $\to$ R2

M[100] $\to$ R3

can be replaced by

• A. R1 $\to$ R3
  
  R2 $\to$ M[100]
• B. R1 $\to$ M[100]
  
  R2 $\to$ R3
• C. M[100] $\to$ R2
  
  R1 $\to$ R2
  
  R1 $\to$ R3
• D. R1 $\to$ R2
  
  R1 $\to$ R3
  
  R1 $\to$ M[100]

Answer 1

The correct option is D R1 $\to$ R2


R1 $\to$ R3

R1 $\to$ M[100]
Internal data forwarding instead write to memory and then read from memory. We read directly from register itself instead from memory i.e,