'Branch history' diaporamas de présentation

CS252 Graduate Computer Architecture Lecture 10 Prediction/Speculation February 22 nd , 2012

CS252 Graduate Computer Architecture Lecture 10 Prediction/Speculation February 22 nd , 2012. John Kubiatowicz Electrical Engineering and Computer Sciences University of California, Berkeley http://www.eecs.berkeley.edu/~kubitron/cs252. Stream of Instructions To Execute. Instruction Fetch

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Static Branch Prediction

Static Branch Prediction. Branch prediction schemes can be classified into static and dynamic schemes. Static methods are usually carried out by the compiler. They are static because the prediction is already known before the program is executed. Some of the static prediction schemes include:

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Dynamic Branch Prediction

Dynamic Branch Prediction. Dynamic branch prediction schemes run-time behavior of branches to make predictions. Usually information about outcomes of previous occurrences of branches are used to predict the outcome of the current branch.

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Static Branch Prediction

Static Branch Prediction. Branch prediction schemes can be classified into static and dynamic schemes. Static methods are usually carried out by the compiler. They are static because the prediction is already known before the program is executed. Some of the static prediction schemes include:

933 views • 59 slides

William Stallings Computer Organization and Architecture 9 th Edition

William Stallings Computer Organization and Architecture 9 th Edition. Chapter 14. Processor Structure and Function. Processor Organization. Fetch instruction The processor reads an instruction from memory (register, cache, main memory) Interpret instruction

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Computer Architecture The P6 Micro-Architecture An Example of an Out-Of-Order Micro-processor

Computer Architecture The P6 Micro-Architecture An Example of an Out-Of-Order Micro-processor. Lihu Rappoport and Adi Yoaz. The P6 Family. Features Out Of Order execution Register renaming Speculative Execution Multiple Branch prediction Super pipeline: 12 pipe stages. *off die.

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Computer Architecture

Computer Architecture. Chapter 3 Instruction-Level Parallelism 2 Prof. Jerry Breecher CSCI 240 Fall 2003. Chapter Overview. 3.1 Instruction Level Parallelism: Concepts and Challenges 3.2 Overcoming Data Hazards with Dynamic Scheduling 3.3 Dynamic Scheduling: Examples & The Algorithm

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Lecture 4. Branch Prediction

COM515 Advanced Computer Architecture. Lecture 4. Branch Prediction. Prof. Taeweon Suh Computer Science Education Korea University. Predict What?. Direction (1-bit) Single direction for unconditional jumps and calls/returns Binary for conditional branches

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CRE652 Processor Architecture Dynamic Branch Prediction

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Static Conditional Branch Prediction

Static Conditional Branch Prediction.

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ILP and Dynamic Execution: Branch Prediction & Multiple Issue

ILP and Dynamic Execution: Branch Prediction & Multiple Issue. Original by Prof. David A. Patterson. Review Tomasulo. Reservations stations: implicit register renaming to larger set of registers + buffering source operands Prevents registers as bottleneck

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Dynamic History-Length Fitting: A third level of adaptivity for branch prediction

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A 256 Kbits L-TAGE branch predictor

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Two-Level Adaptive Dynamic Branch Prediction

Two-Level Adaptive Dynamic Branch Prediction. Jeroen Lichtenauer. Contents. The problem to be solved Solutions Overview Prediction counter Two-Level Adaptive Branch Prediction Summary Conclusion Related Work. Literature.

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Dynamic Branch Prediction

Dynamic Branch Prediction. Why does prediction work? Underlying algorithm has regularities Data that is being operated on has regularities Instruction sequence has redundancies that are artifacts of way that humans/compilers think about problems

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Predicate Execution

Predicate Execution. 2008/01/10 Presented by Jinho. Performance degradation. mov r1 = 0; if( r2 == r3 ) mov r1 = 1; else mov r1 = 2; mov r4 = r1;. mov r1 = 0; cmp.eq p1,p2=r2,r3; ( p1) mov r1 = 1; ( p2) mov r1 = 2; mov r4 = r1;. Problem Multiple definition

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Lecture 21: Instruction Level Parallelism (Branch Prediction)

Lecture 21: Instruction Level Parallelism (Branch Prediction). Computer Engineering 585 Fall 2001. PC. Associative Lookup expensive!. A0. 0. A1. 1. log k. A2. 1. BPB Index. PC. A(k-1). 0. Branch Prediction Buffer. IF. ID. EX. M. WB. I-Cache. PC. Branch Target Buffer (BTB).

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Optimized Hybrid Scaled Neural Analog Predictor

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Branch Prediction

Branch Prediction. February 17, 2005 Prof. Nancy Warter-Perez Note: These lecture notes are modified from Profs. Dave Patterson and John Kubiatowicz. Prediction: Branches, Dependencies, Data New era in computing?.

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Computer Architecture Instruction Level Parallelism

Computer Architecture Instruction Level Parallelism. Dr. Esam Al-Qaralleh. Static Branch Prediction. To reorder code around branches, need to predict branch statically when compile Simplest scheme is to predict a branch as taken Average misprediction = untaken branch frequency = 34% SPEC.

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