Code Example LD F6,34(R2) LD F2,45(R3) MULTI F0,F2,F4 SUBD F8,F6,F2

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Presentation transcript:

Code Example LD F6,34(R2) LD F2,45(R3) MULTI F0,F2,F4 SUBD F8,F6,F2 DIVD F10,F0,F6 ADD F6,F8,F2 LD1 LD2 SUBD MULTI ADD DIVD Operation latencies: load/store 2 cycles, Add/sub 2 cycles, Mult 10 cycles, divide 40 cycle

Tomasulo Example Cycle 0 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 1 Yes Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 2 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 3 Note: registers names are removed (“renamed”) in Reservation Stations Load1 completing; what is waiting for Load1? Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 4 Load2 completing; what is waiting for it? Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 5 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 6 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 7 Add1 completing; what is waiting for it? Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 8 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 9 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 10 Add2 completing; what is waiting for it? Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 11 Write result of ADDD here vs. scoreboard? Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 12 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 13 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 14 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 15 Mult1 completing; what is waiting for it? Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 16 Note: Just waiting for divide Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 55 Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 56 Mult 2 completing; what is waiting for it? Adapted from UCB CS252 S98, Copyright 1998 USB

Tomasulo Example Cycle 57 Again, in-oder issue, out-of-order execution, completion Adapted from UCB CS252 S98, Copyright 1998 USB