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Investigating Predictive Techniques for Out of Order Logic

Investigating Predictive Techniques for Out of Order Logic. Kenneth Barr Kenneth Conley Serhii Zhak. The Problem. Out of order logic is getting more complex, increasing power consumption. Optimized for performance, not power

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Investigating Predictive Techniques for Out of Order Logic

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  1. Investigating Predictive Techniques for Out of Order Logic Kenneth Barr Kenneth Conley Serhii Zhak

  2. The Problem • Out of order logic is getting more complex, increasing power consumption. • Optimized for performance, not power • How can memoization and predictive techniques be applied to introduce power savings?

  3. Methodology • Examine key out of order logic structures: • Register renaming • Superscalar issue logic • Look for correlation between state and asserted control signals • Redesign logical structures to increase correlation • Add new logical structures to apply predictive techniques to out of order logic

  4. Issues • How do we determine the power savings of our scheme? • How do we detect mispredictions, and what kind of mispredictions are possible? • How do we recover from mispredictions in the issue logic?

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