Various hazards

Question

Write down the various hazards?

Answer 1

There are circumstances, called hazards which prevent the subsequently instruction in the instruction stream from executing throughout its designated clock cycle. Hazards lessen the performance from the ideal speed-up gained through pipelining. There are three kinds of Hazards which are illustrated below:

i). Structural Hazards : It takes place from resource differences when the hardware can’t support all probable combinations of instructions concurrently in overlapped implementation.

ii). Data Hazards : It takes place when an instruction based on the results of preceding instruction in a manner that is exposed through the overlapping of instructions in pipeline.

iii). Control Hazards : It takes place from the pipelining of branches and further instructions which change the PC.