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Branch history table - PowerPoint PPT Presentation

Dynamic Branch Prediction & Speculation & more ILP

Dynamic Branch Prediction & Speculation & more ILP

Dynamic Branch Prediction & Speculation & more ILP. Branches Kill!. Branches are very frequent Branches arrive much faster when multiple instructions are issued per clock According to ?? Approx. 20% of all instructions Can not wait until we know where it goes

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875 views • 72 slides
Loop Unrolling

Loop Unrolling

Loop Unrolling. Determine loop unrolling useful by finding that loop iterations were independent Determine address offsets for different loads/stores Increases program size Use different registers to avoid unnecessary constraints forced by using same registers for different computations

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722 views • 58 slides
CS 230: Computer Organization and Assembly Language

CS 230: Computer Organization and Assembly Language

CS 230: Computer Organization and Assembly Language. Aviral Shrivastava. Department of Computer Science and Engineering School of Computing and Informatics Arizona State University. Slides courtesy: Prof. Yann Hang Lee, ASU, Prof. Mary Jane Irwin, PSU, Ande Carle, UCB. Announcements.

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318 views • 25 slides
Lecture 21: Instruction Level Parallelism (Branch Prediction)

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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305 views • 15 slides
Computer Architecture Instruction Level Parallelism

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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242 views • 11 slides

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