GATE 2024 CSE & IT Q30

Question

Consider a 5-stage pipelined processor with Instruction Fetch (IF), Instruction Decode (ID), Execute (EX), Memory Access (MEM), and Register Writeback (WB) stages. Which of the following statements about forwarding is/are CORRECT?

Accepted Answer

A;B;C

Answer

In a pipelined execution, forwarding means the result from a source stage of an earlier instruction is passed on to the destination stage of a later instruction

Answer

In forwarding, data from the output of the MEM stage can be passed on to the input of the EX stage of the next instruction

Answer

Forwarding cannot prevent all pipeline stalls

Answer

Forwarding does not require any extra hardware to retrieve the data from the pipeline stages