Branch predictor design and performance estimation for a high performance embedded microprocessor
Pages 519 - 522
Abstract
AE64000 is a 64-bit embedded processor targeting high-end embedded applications such as HDTV, DVD, and 3D graphics. To achieve a higher performance for the AE64000, we design a branch predictor for the processor, and find the optimum parameters for the design through cycle-accurate simulations on SpecINT benchmarks and embedded applications (Dhrystone and Whetstone).In AE64000 branch prediction is complicated by the Instruction Folding Unit (IFU) of the processor front-end. By predicting on a Pre-PC in the IFU rather than using a PC in the pipeline core, we can effectively eliminate branch misprediction penalty on a correct prediction. We have developed the AE64000 simulator to evaluate the performance of the designed branch predictor, and selected the optimum branch predictor configuration by considering cost-effectiveness as well as by analyzing the results generated from AE64000 simulator. The selected branch predictor has been implemented in Verilog and is added to AE64000 pipeline.
References
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S. McFarling, "Combining Branch Predictors", DEC WRL Technical Note TN-36, June 1993
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Brian K. Bray, M. J. Flynn, "Strategies for branch target buffers", Proceedings of the 24th Annual International Symposium on Microarchitecture, September 1991
[3]
T. Y. Yeh, D. Marr, Y. Patt, "Increasing the Instruction Fetch Rate via Multiple Branch Prediction and a Branch Address Cache", in proceeding of the 1993 International Conference on Supercomputing, 1993
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John L Hennessy, David A Patterson, "Computer Architecture: A Quantitative Approach" 2nd edition, published by Morgan Kaufmann, 1996
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T. Y. Yeh and Y. N. Patt, "Alternative Implementations of Two-Level Adaptive Branch Prediction", in Proceedings of the 19th Annual ACM/IEEE International Symposium on Computer Architecture, 1992
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The Standard Performance Evaluation Corporation, http://www.specbench.org
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Sponsors
- IPSJ: Information Processing Society of Japan
- IEEE Circuits and Systems Society
- SIGDA: ACM Special Interest Group on Design Automation
- IEICE: Institute of Electronics, Information and Communication Engineers
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Association for Computing Machinery
New York, NY, United States
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Published: 21 January 2003
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