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Which of the following hazards occurs when the pipeline makes the wrong decision on a branch prediction and therefore brings instructions into the pipeline that must subsequently be discarded? 

Which of the following hazards occurs when the pipeline makes the wrong decision on a branch prediction and therefore brings instructions into the pipeline that must subsequently be discarded?  Correct Answer Branch hazard

The correct answer is option 4.

Concept:

Branch hazards occur when the pipeline makes wrong decisions on branch prediction and therefore brings instructions into the pipeline that must subsequently be discarded.

  • The term branch hazard also refers to a control hazard or instruction hazard.

  • Branch hazard form of dependence happens when control instructions such as BRANCH, CALL, JMP, and others are transferred. When the processor wants to introduce a new instruction into the pipeline, it will not know the target address of these instructions on many instruction architectures.

Hence the correct answer is Branch hazard.

Additional Information

  • True data dependence or (RAW - Read After Write) is dependence when the output of one instruction is required as an input of one of the following instructions, a dependency exists.
  • Output dependency or (WAW - Write After Write) is dependence. This type of dependence occurs when two instructions use the same output location and write to the same register/memory address.
  • Anti-dependency or (WAR - Write After Read) is dependence. When an instruction takes a value from a memory location or a register as an input operand, and one of the succeeding instructions writes to that location/register, this form of dependence occurs.

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