What is branch prediction and why is it important in computer architecture?

What is branch prediction and why is it important in computer architecture?

Branch prediction is a technique used in computer architecture to improve the flow in instruction pipelines. It predicts the direction of branch instructions to minimize delays.

Can you tell me about the history of branch prediction?

Branch prediction has evolved significantly since the 1960s. Early computers used simple static predictions, while modern processors employ complex dynamic prediction algorithms.

What are some common algorithms used for branch prediction?

Common algorithms include static prediction, two-level adaptive predictors, and tournament predictors, each with varying complexity and accuracy.

How does branch prediction impact CPU performance?

Effective branch prediction can significantly enhance CPU performance by reducing pipeline stalls and improving instruction throughput.

Are there any drawbacks to branch prediction?

Yes, incorrect predictions can lead to performance penalties due to pipeline flushing, and complex predictors can increase hardware costs.