Homework3emptytables.F15 (1)

Homework3emptytables.F15 (1) - Problem 1(20pts a Tomasulo...

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Problem 1 (20pts) a. Tomasulo algorithm – no speculation Dispatch Issue Exec Start Exec Complete Cache CDB Comments I1 L.D F0, 0(R1) I2 L.D F4, 0(R2) I3 MUL.D F8, F0, F4 I4 ADDI R1, R1, #8 I5 ADDI R2, R2, #8 I6 S.D-A F8, -8(R2) I7 S.D-D F8, -8(R2) I8 BNE R4, R2, LOOP I9 L.D F0, 0(R1) b. Tomasulo algorithm with speculation Dispatch Issue Exec Start Exec Complete Cache CDB Retired Comments I1 L.D F0, 0(R1) I2 L.D F4, 0(R2) I3 MUL.D F8, F0, F4 I4 ADDI R1, R1, #8 I5 ADDI R2, R2, #8 I6 S.D-A F8, -8(R2) I7 S.D-D F8, -8(R2) I8 BNE R4, R2, LOOP I9 L.D F0, 0(R1) c. Tomasulo algorithm with speculative scheduling Dispatc h Issu e Reg Fetch Exec Start Exec Complete Cache CDB Retire Comments I1 L.D F0, 0(R1) I2 L.D F4, 0(R2) I3 MUL.D F8, F0, F4 I4 ADDI R1, R1, #8 I5 ADDI R2, R2, #8 I6 S.D-A F8, -8(R2) I7 S.D-D F8, -8(R2) I8 BNE R4, R2, LOOP I9 L.D F0, 0(R1) Problem 2 (20pts) (a) Conservative (a load is not issued to cache until the addresses of all previous stores are known) Disp atch Iss ue Exe c sta rt Exec comp lete Cac he CDB Reti re Comments I1 L.D F2,0(R1) I2 L.D F3,0(R2)
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