Problem 2. Control and Data Hazards Clara, now a senior engineer, at C3 (Creativ

Question

Problem 2. Control and Data Hazards Clara, now a senior engineer, at C3 (Creative Computer Corporation) is working on a new pipelined processor. She has a benchmark that has the following characteristics: 33% ALU instructions, 27% load instructions (15% of loads are followed by instructions that use the data being loaded) 16% store instructions 24% branch instructions (58% of these branches are taken). This processor's CPlint is 1 (when there are no hazards). Please answer the following questions: Considering control and data hazards, please compute the overall CPl. Assume that all branch instructions cause hazards (the penalty is 1 clock cycle)

Explanation / Answer

Answer:-

As all branch instructions causes hazards and its clock cycle is 1. So, CPI is given as:

As there is 1 extra cycle for branch instruction due to hazard. so, total no. of cycles for branch instruction becomes 4.

CPI=(33/100*1)+(27/100*2)+(16/100*2)+(24/100*4)

CPI=2.15

Instructions Percentage No. Of cycle ALU 33 1 Load 27 2 Store 16 2 Branch 24 3

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