Consider the following sequence of outcomes for a particular branch instruction: T, NT, T, NT, T, NT, T, NT…. Assume this sequence repeats indefinitely. Part A: The Easy Part What is the long-term (steady-state) accuracy of the predict-taken predictor? What about predict-not-taken?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Consider the following sequence of outcomes for a particular branch instruction:

T, NT, T, NT, T, NT, T, NT….

Assume this sequence repeats indefinitely.

Part A: The Easy Part 

What is the long-term (steady-state) accuracy of the predict-taken predictor? What about predict-not-taken?

Part B: 1-bit predictor 

What is the long-term (steady-state) accuracy of the 1-bit predictor? If its initial state matters, explain.

Part C: 2-bit predictor 

What is the long-term (steady-state) accuracy of the 2-bit predictor? If its initial state matters, explain.

Part D: Custom Predictor 

Design your own predictor that uses no more than 2 bits of state to maximize prediction accuracy for this pattern. Show the state diagram, and give the long-term accuracy of your predictor. If its initial state matters, explain.

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