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Example

Example. Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop . Speculative Dynamic Machine specification Issue rate of 1 One broadcast per cycle for CDB branch takes 1 cycle,

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Example

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  1. Example Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop

  2. Speculative Dynamic Machine specification • Issue rate of 1 • One broadcast per cycle for CDB • branch takes 1 cycle, • Load takes 1 cycle, • integer alu takes 1 cycle, • float add takes 2 cycle • float multiply takes 3 cycle. • These cycle count doesn’t include write to CDB

  3. Reorder buffer Cycle 0 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  4. Reorder buffer Cycle 1 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  5. Reorder buffer Cycle 2 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  6. Reorder buffer Cycle 3 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  7. Reorder buffer Cycle 4 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  8. Reorder buffer Cycle n Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  9. Reorder buffer Cycle n+1 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  10. Reorder buffer Cycle n+2 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop FP register status

  11. Reorder buffer Cycle n+3 Reservation table Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R1, Loop FP register status

  12. VLIW example Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop • Static machine specification • One delay slot between any true data flow dependency • One branch delay slot

  13. Register rename Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F0, 0(R2) Mult.D F0, F0, F2 S.D 0(R2), F0 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F1, 0(R2) Mult.D F1, F1, F2 S.D 0(R2), F1 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop

  14. Instruction reorder Loop: L.D F0, 0(R1) Add.D F0, F0, F2 S.D 0(R1), F0 L.D F1, 0(R2) Mult.D F1, F1, F2 S.D 0(R2), F1 SUBI R1, R1, 8 SUBI R2, R2, 8 BNEZ R2, Loop Loop: L.D F0, 0(R1) L.D F1, 0(R2) Add.D F0, F0, F2 Mult.D F1, F1, F2 S.D 0(R1), F0 S.D 0(R2), F1 SUBI R2, R2, 8 BNEZ R2, Loop SUBI R1, R1, 8

  15. Software pipeline Code for one iteration. L.D F0, 0(R1) L.D F1, 0(R2) Add.D F0, F0, F2 Mult.D F1, F1, F2 S.D 0(R1), F0 S.D 0(R2), F1 SUBI R2, R2, 8 SUBI R1, R1, 8 BNEZ R2, Loop L.D F0, 0(R1) L.D F1, 0(R2) Add.D F0, F0, F2 Mult.D F1, F1, F2 S.D 0(R1), F0 S.D 0(R2), F1 SUBI R2, R2, 8 SUBI R1, R1, 8 BNEZ R2, Loop L.D F0, 0(R1) L.D F1, 0(R2) Add.D F0, F0, F2 Mult.D F1, F1, F2 S.D 0(R1), F0 S.D 0(R2), F1 SUBI R2, R2, 8 SUBI R1, R1, 8 BNEZ R2, Loop 8 copies

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