PPT-1 Lecture: Branch Prediction, Out-of-order Processors

Topics branch predictors outoforder intro register renaming 2 2Bit Bimodal Prediction For each branch maintain a 2bit saturating counter if the branch is taken counter min3counter1. Guangyu Shi and Mikko Lipasti. University of Wisconsin-Madison. June 4, 2011. Perceptron Branch Prediction. Perceptron branch predictor [Jiménez & Lin, 2001]. 7 4 -8 -3 -5 . PC. CS 3220. Fall 2014. Hadi Esmaeilzadeh. hadi@cc.gatech.edu. . Georgia Institute of Technology. Some slides adopted from Prof. . Milos . Prvulovic. Control Hazards Revisited. Forwarding helps a lot with data hazards. 6th Edition. . Chapter 12: Floating-Point Processing and Instruction Encoding. (c) Pearson Education, 2010. All rights reserved. You may modify and copy this slide show for your personal use, or for use in the classroom, as long as this copyright statement, the author's name, and the title are not changed.. CS448. 2. Instruction Level Parallelism (ILP). Pipelining . Limited form of ILP. Overlapping instructions, these instructions can be evaluated in parallel (to some degree). Pipeline CPI = Idea pipeline CPI + Structural Stalls + RAW stalls + WAR stalls + WAW stalls + Control Stalls. Contents . Vector processor. Vector instructions. Vector pipelines. Scalar pipeline execution. Vector pipeline execution. Symbolic processors. Attributes. Characteristics. Vector Processors. A vector processor is specially designed to perform vector computations.. 5. Branch Prediction . (2.3) and . Scoreboarding. (A.7). 2. Why do we want to predict branches?. MIPS based pipeline – 1 instruction issued per cycle, branch hazard of 1 cycle.. Delayed branch. Modern processor and next generation – multiple instructions issued per cycle, more branch hazard cycles will incur.. Consider executing this sequence of instructions in the pipeline:. address instruction. ----------------------------. 36: sub $10, $4, $8. 40: . beq. $1, $3, 72. 44: and $12, $2, $5. Branch Prediction. Static Branch Prediction. To reorder code around branches, we need to predict branch statically when compiling. Always taken / not taken. Can be compiler directed. Delayed Branch . Smruti. R. Sarangi. Contents. In-order Pipelines. Out-of-order Pipelines: Motivation. Out-of-order Pipelines: Basics. Branch Prediction. Pipelines. What do we know up till now: . In-order Pipelines. Evangelia A. Sitaridi, Kenneth A. Ross. Columbia University. DaMoN Workshop. 21st May 2012. . Introduction (1/2). Earlier GPU implementations of data processing operators have resulted in significant speedups. Address prediction and recovery. (And interrupt recovery too.). Announcements:. Programming assignment #2 . Due today. Extending to midnight.. HW . #2 due . Monday 2/3. P3 posted . tonight. Reading. Mar 6, 2019. ADVANCED COMPUTER . ARCHITECTURE . CS . 4330/6501. Branch Prediction. The content and concept of this course are adapted from CMU ECE 740. AGENDA. Logistics. Review from the last class. Branch Prediction. Samira Khan University of Virginia Nov 13, 2017 COMPUTER ARCHITECTURE CS 6354 Branch Prediction I The content and concept of this course are adapted from CMU ECE 740 AGENDA Logistics Branch Prediction EE194/Comp140 Mark Hempstead ECEC 194: High Performance Computer Architecture Spring 2016 Tufts University Instructor: Prof. Mark Hempstead mark@ece.tufts.edu Lecture 3: Review of Branch Prediction, Memory Hierarchy and Caches