PPT-Dynamic Branch Prediction

Static Branch Prediction Code around delayed branch 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. (. iPhone. 3G). Jeff Brantley. Chris Gregg. Bill . Stitson. Processor Overview. Features. Designed for consumer and wireless products . RISC Processor with Harvard Architecture. Vector Floating Point coprocessor. 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. Saehoon Kim. §. , . Yuxiong He. *. ,. . Seung-won Hwang. §. , . Sameh Elnikety. *. , . Seungjin Choi. §. §. *. Web Search Engine . Requirement. 2. Queries. High quality + Low latency. This talk focuses on how to achieve low latency without compromising the quality. Debajit. B. h. attacharya. Ali . JavadiAbhari. ELE 475 Final Project. 9. th. May, 2012. Motivation. Branch Prediction. Simulation Setup & Testing Methodology. Dynamic Branch Prediction. Single Bit Saturating Counter. 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.. Computer Architecture and Implementation. Montek Singh. Oct 10, 2016. Topic: . Instruction-Level . Parallelism - . I. (Dynamic Branch Prediction). Instruction-Level Parallelism. Exploit . parallelism . 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 . As we saw last week, dynamic instruction issue allows us to exploit as much parallelism as exists in instruction code. Our stalling situations are limited to finite resources, cache misses and branches. As we saw last week, dynamic instruction issue allows us to exploit as much parallelism as exists in instruction code. Our stalling situations are limited to finite resources, cache misses and branches. 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 Lecture 17b: Branch Prediction I. Prof. Onur Mutlu. ETH Zurich. Spring 2019. 18 April 2019. Required . Readings. This week. Smith and . Sohi. , “. The Microarchitecture of Superscalar Processors. ,. Saehoon Kim. §. , . Yuxiong He. *. ,. . Seung-won Hwang. §. , . Sameh Elnikety. *. , . Seungjin Choi. §. §. *. Web Search Engine . Requirement. 2. Queries. High quality + Low latency. This talk focuses on how to achieve low latency without compromising the quality. Draw a state machine for a 2 bit branch prediction scheme . Explain the impact on the compiler of branch delay. . Chapter 4 — The Processor — . 2. Control Hazards. Consider:. . add $t1, $zero, $zero # . Topics: branch predictors, out-of-order intro, register renaming. 2. 2-Bit Bimodal Prediction. For each branch, maintain a 2-bit saturating counter:. if the branch is taken: counter = min(3,counter+1).