If a simple pipelined processor is super-pipelined by a factor of 3 (the alu takes 3 cycles instead of one for the smallest operation), back-to-back dependent instructions require stall cycles to be inserted even with perfect bypassing.

2

Explanation:

If it is super pipelined with ALU taking 3 cycles the back to back dependent instructions require to insert 2 stall cycles as the control unit can stall the execution of the pipeline as as the ALU takes time in execution using 3 cycles. This is done so in order to avoid a hazard in the pipeline.

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