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A delay slot on some machines is

  • A.an instruction position after a branch that always executes
  • B.a gap the hardware inserts when a pipeline stalls
  • C.a register that is reserved for use by the operating system
  • D.the time taken to fetch an instruction from memory

Answer: A

The compiler tries to fill the slot with useful work rather than a no operation. Finding a suitable instruction is a small but real scheduling problem. Modern processors have largely removed the need by handling branches in hardware.

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