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Module 3: Pipelining

20192m

In case of pipelining processor, loop buffer is

  • (i) very high speed memory maintained by the instruction fetch stage
  • (ii) very high speed memory maintained by the instruction decode stage
  • (iii) very high speed memory maintained by the instruction execute stage
  • (iv) None of the above
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Correct option: (i) High-speed memory at fetch stage (Loop Buffer)

Loop buffer is a small, very high-speed memory at the instruction fetch stage that stores recently fetched instruction sequence of a loop. On loop repetition, instructions are fetched directly from buffer instead of main memory/cache, reducing fetch time and memory traffic. Hence answer is (i).

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