PPT-Decrement and Branch Instruction

It is used for implementing Loop control dbcc dn LABEL Example dbgt decrement and branch unless greater than The branch instruction used in these instructions is opposite to the way it is used in other branch instructions. It is used for implementing Loop control. . . dbcc. . dn. , LABEL. Example: . dbgt. . (decrement and branch unless greater than). The branch instruction used in these instructions is opposite to the way it is used in other branch instructions. 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. Computer Organization . and Architecture. 7. th. Edition. Chapter 12. CPU Structure and Function. Group 5. . Chris Bello. Arnold . Colina. . Edemio. . Navas. . Rieni. Gonzalez . CPU Structure. Tony Joseph. Sergio Martinez. Daniel . Rultz. Reginald. Brandon Haas. Emmanuel Sacristan. Keith Bellville. Chapter 12. Processor Structure and Function. To understand the organization of the CPU, we must learn those requirement which are. 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. Two forms of pipelining. Instruction unit. overlap fetch-execute cycle so that multiple instructions are being processed at the same time, each instruction in a different portion of the fetch-execute cycle. 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. 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. Two forms of pipelining. Instruction unit. overlap fetch-execute cycle so that multiple instructions are being processed at the same time, each instruction in a different portion of the fetch-execute cycle. address instruction. ----------------------------. 36: sub $10, $4, $8. 40: . beq. $1, $3, 72. 44: and $12, $2, $5. 48: or $13,$. 12,$13. . 52: add $14, $4, $2. cycle. Structural hazards. A required resource is busy. Data hazard. Need to wait for previous instruction to complete its data read/write. Control hazard. Deciding on control action depends on previous instruction. 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. ,. 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 # .