'Subi r1' presentation slideshows

Tomasulo Algorithm and Dynamic Branch Prediction

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Introduction to Advanced Pipelining

Introduction to Advanced Pipelining. February 24, 2005 Prof. Nancy Warter-Perez Note: These lecture notes are modified from Profs. Dave Patterson and John Kubiatowicz. Review: Summary of Pipelining Basics. Hazards limit performance Structural: need more HW resources

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Lecture 4: Introduction to Advanced Pipelining

Lecture 4: Introduction to Advanced Pipelining. Prepared by: Professor David A. Patterson Computer Science 252, Fall 1996 Edited and presented by : Prof. Kurt Keutzer Computer Science 252, Spring 2000. Review: Evaluating Branch Alternatives. Two part solution:

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John Kubiatowicz Electrical Engineering and Computer Sciences University of California, Berkeley

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Lecture 3: Introduction to Advanced Pipelining

Lecture 3: Introduction to Advanced Pipelining. Professor David A. Patterson Computer Science 252 Fall 1996. Review: Evaluating Branch Alternatives. Two part solution: Determine branch taken or not sooner, AND Compute taken branch address earlier.

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Lecture 3: Introduction to Advanced Pipelining

Lecture 3: Introduction to Advanced Pipelining. Professor David A. Patterson Computer Science 252 Spring 1998 edited by C. Halatsis Winter 2001. Review: Evaluating Branch Alternatives. Two part solution: Determine branch taken or not sooner, AND Compute taken branch address earlier.

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Chapter 2

Chapter 2. Instruction Level Parallelism. Instruction Level Parallelism (ILP). ILP: Overlap execution of unrelated instructions gcc 17% control transfer 5 instructions + 1 branch Beyond single block to get more instruction level parallelism Loop level parallelism one opportunity, SW and HW

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Chapter 2-3: Basic Program Transformations

Chapter 2-3: Basic Program Transformations. Optimizing your code. Transforming the code to something different than the programmer wrote, but that still does the same thing, can have a huge impact on performance Is this a compiler subject or a computer architecture subject? Yes!

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John Kubiatowicz Electrical Engineering and Computer Sciences University of California, Berkeley

CS252 Graduate Computer Architecture Lecture 6 Static Scheduling, Scoreboard February 6 th , 2012. John Kubiatowicz Electrical Engineering and Computer Sciences University of California, Berkeley http://www.eecs.berkeley.edu/~kubitron/cs252. PC saved Disable All Ints Supervisor Mode. ?

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Lecture 17: Instruction Level Parallelism (ILP) & Input/Output (I/O)

Lecture 17: Instruction Level Parallelism (ILP) & Input/Output (I/O). Michael B. Greenwald Computer Architecture CIS 501 Fall 1999. Administration. HW #4 due today. HW #5 being handed out. (Notice it is due in 1 week!) Schedule: office hours are 1/2 hour early on Thursday

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Lecture 17: Instruction Level Parallelism

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Lecture 8 Advanced Pipeline

Lecture 8 Advanced Pipeline. Technique Reduces. Advanced Pipelining and Instruction Level Parallelism. Loop unrolling Control stalls Basic pipeline scheduling RAW stalls Dynamic scheduling with scoreboarding RAW stalls Dynamic scheduling with register renaming WAR and WAW stalls

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Compiler techniques for exposing ILP

Compiler techniques for exposing ILP . Instruction Level Parallelism. Potential overlap among instructions Few possibilities in a basic block Blocks are small (6-7 instructions) Instructions are dependent Goal: Exploit ILP across multiple basic blocks Iterations of a loop

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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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Compiler Techniques for ILP

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DLX Register Ops

DLX Register Ops. Team Brian Leslie Stephen Brenner Brian Leslie Ben Whitcher. Instruction Types. I-type (immediate) R-type (register to register) J-type (jump). Arithmetic & Logical Instructions. Arithmetic Logical Shift Set-On-Comparison. Arithmetic. ADD, SUB, MULT, DIV

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DLX Register Ops

DLX Register Ops. Team Stephen Brenner Brian Leslie Ben Whitcher. Instruction Types. I-type (immediate) R-type (register to register) J-type (jump). Arithmetic & Logical Instructions. Arithmetic Logical Shift Set-on-comparison. Arithmetic. ADD, SUB, MULT, DIV Two registers.

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ILP (Recap)

ILP (Recap). Instruction Level Parallelism. Basic Block (BB) ILP is quite small BB: a straight-line code sequence with no branches in except to the entry and no branches out except at the exit

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