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lecture5a
Course: ECE 411, Spring 2008School: University of Illinois,...
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5a 1 ECE Lecture 411 Lecture 5a Wen-mei Hwu Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved. IMPACT Lecture 5a 2 Tomasulo's Algorithm Register renaming tags for values Out-of-order execution reservation stations Data forwarding common data bus UIUC ECE...
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5a
1
ECE Lecture 411 Lecture 5a
Wen-mei Hwu
Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
2
Tomasulo's Algorithm
Register renaming
tags for values
Out-of-order execution
reservation stations
Data forwarding
common data bus
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
3
Tomasulo's Algorithm
Instruction decode
fetch register file for value and tag tag is handle for data currently being generated determine RS to hold the decoded operations
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
4
Tomasulo's Algorithm
Instruction Issue
insert operation and operands into reservation station entry asisgned mark destination register as not ready
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
5
Tomasulo's Algorithm
Operation dispatch
identify operations ready for execution determine highest priority operation for each port/function unit
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
6
Tomasulo's Algorithm
Data forwarding
result value and tag distributed to RS entries for associative search result value and tag delivered to destination register for potential update
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture Out-of-Order 5a
7
P6-like Execution
Analyzed info and figures available on WWW in papers Drew on experience with previous Out-Of-Order design Actual P6 implementation may differ from this analysis
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
8
Out-of-Order Core
Register Alias Table (RAT) Reservation Station (RS) Reorder Buffer (ROB) Retirement Register File (RRF)
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
9
Key Out-of-Order issues
Register renaming Reservation Station
writing operations into RS dispatching operations back-to-back Selecting operations for dispatch Selecting ports for dispatch
UIUC ECE 411 Computer Microarchitecture: Hardware and Software 1999, Wen-mei W. Hwu, All Rights Reserved.
IMPACT
Lecture 5a
10
Key Out-of-order Issues
Maintaining precise state
recovering from exceptions recovering from mispredi...
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