COMP3370A3.pdf - COMP3370 A3 Jingyi Huang 7787399 1 a b Actual CPI should be 5 199 = 204 Total time 204*250 = 5.1 × 10\$ ps 2 In this instruction

# COMP3370A3.pdf - COMP3370 A3 Jingyi Huang 7787399 1 a b...

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COMP3370 A3 Jingyi Huang 7787399 1. a) Actual CPI should be 5+199 = 204 b) Total time: 204*250 = 5.1 × 10 \$ ps 2. In this instruction sequences, there are 3 dependencies. And we need to check every single instruction to make sure there is no MEM hazard. Here, in I-1, the data in EX/MEM should be forwarded to I-2 since we need to use it in ID/EX buffer. Also, we need to compare the value in MEM/WB with the value in EX/MEM. If they are the same, the I-2 is not done with ALU operation, thus we need to wait until the outcome before we forward the result to I-3. So, the Data path diagram should be: The modified equation: IF (MEM/WB.RegWrite and (MEM/WB.RegisterRd ≠ 0) and (MEM/WB.RegsterRd = ID/EX.RegisterRs)) and (ID/EX.RegisterRd ≠ 0 ) then Forward value read to 2 nd ALU input. 3. Branch history table (BHT) is a table contains the address of branch instruction and prediction bits; it uses the tagged structure, after an entry is referenced, its tag is compared against the address of the branch instruction to decide if the branch is taken or not; if it matches, hit occurs and the prediction bits from this entry are used to predict the branch outcome, otherwise, the branch is not taken. We use the index of the address of branch instruction to access this table;

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