Question : In computer science, data hazard occurs when
Option 1: pipeline changes the order of read/write access to operands.
Option 2: performance loss.
Option 3: machine size is limited.
Option 4: some functional unit is not fully pipelined.
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Correct Answer: pipeline changes the order of read/write access to operands.
Solution : The correct answer is pipeline changes the order of read/write access to operands .
When the pipeline alters the sequence of read/write accesses to operands, the order changes from the order observed by sequential executing instructions on the unpipelined processor. A data hazard occurs when two instructions need to access the same operand and one of the instructions needs to write to the operand.
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