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Lecture 7: Static ILP, Branch prediction

Lecture 7: Static ILP, Branch prediction. Topics: static ILP wrap-up, bimodal, global, local branch prediction (Sections 2.2-2.6). Predication. A branch within a loop can be problematic to schedule Control dependences are a problem because of the need to re-fetch on a mispredict

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Lecture 7: Branch prediction

Lecture 7: Branch prediction. Topics: bimodal, global, local branch prediction (Sections 2.3-2.6). Dynamic Vs. Static ILP. Static ILP: + The compiler finds parallelism ? no scoreboarding ? higher clock speeds and lower power + Compiler knows what is next ? better global schedule

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Lecture 8: Branch Prediction, Dynamic ILP

Lecture 8: Branch Prediction, Dynamic ILP. Topics: static speculation and branch prediction (Sections 2.3-2.6). Correlating Predictors. Basic branch prediction: maintain a 2-bit saturating counter for each entry (or use 10 branch PC bits to index

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275 views • 12 slides

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Basic branch prediction maintain - PowerPoint PPT Presentation

Lecture 7: Static ILP, Branch prediction

Lecture 7: Branch prediction

Lecture 8: Branch Prediction, Dynamic ILP