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Chapter 3. Instruction-Level Parallelism and. Its Exploitation. 2. Introduction. 0. Instruction level parallelism = ILP = – (potential) overlap among instructions. 0. First universal ILP: pipelining (since 1985). 0. Two approaches to ILP. – Discover and exploit parallelism in hardware. 0. Dominant in server and desktop market
rent techniques that exploit instruction-level parallelism and their effectiveness in targeting memory system performance. Chapter 3 shows the interaction between software prefetch- ing and ILP. Chapter 4 proposes software code transformations that aim to improve the interaction of ILP with memory system performance by
4.1.3 Partial ignoring of speculative exceptions . .. CHAPTER 1. INTRODUCTION. Superscalar and very long instruction word VLIW processors can potentially provide large performance improvements over their scalar Branch instructions are the major impediment to exploiting ILP in nonnumeric applications. There are
1. Pipelining; hazards. 2. ILP - data, name, and control dependence. 3. Compiler techniques for exposing ILP: Pipeline scheduling,. Loop unrolling, Strip mining, Branch prediction. 4. Register renaming. 5. Multiple issue and static scheduling. 6. Speculation. 7. Energy efficiency. 8. Multi-threading. 9. Fallacies and pitfalls. 10.
Advanced Computer Architecture. Chapter 3. Instruction Level Parallelism and. Dynamic Execution. January 2009. Paul H J Kelly. These lecture notes are partly based on the course text, Hennessy and Patterson's Computer Architecture, a quantitative approach (3rd. 4th eds), and on the lecture slides of David Patterson and
1 Loop: L.D. F0,0(R1). 2. L.D. F6,-8(R1). 3. L.D. F10,-16(R1). 4. L.D. F14,-24(R1). 5. ADD.D F4,F0,F2. 6. ADD.D F8,F6,F2. 7. ADD.D F12,F10,F2. 8. ADD.D F16,F14,F2. 9. S.D. 0(R1),F4. 10. S.D. -8(R1),F8. 11. S.D. -16(R1),F12. 12. DSUBUI R1,R1,#32. 13. BNEZ R1,LOOP. 14. S.D. 8(R1),F16. ; 8-32 = -24. 14 clock cycles, or
3 Instruction-Level Parallelism and Its Exploitation “Who's first?" “America." “Who's second?" “Sir, there is no second." Dialog between two observers of the sailing race later named “The America - Selection from Computer Architecture, 5th Edition [Book]
Advanced Computer Architecture. Chapter 5. Instruction Level Parallelism. - the static scheduling approach the static scheduling approach. February 2009. Paul H J Kelly. These lecture notes are partly based on the course text, Hennessy and Patterson's Computer Architecture, a quantitative approach (3rd and 4th eds), and
Chapter 3. ILP. 1. 2. Inst I before inst j in in the program. Read After Write (RAW) InstrJ tries to read operand before InstrI writes it; Caused by a “Dependence" (in compiler nomenclature). This hazard results from an actual need for communication. Three Generic Data Hazards. I: add r1,r2,r3. J: sub r4,r1,r3. 3. Write After Read
Chapter 4 Exploiting Instruction Level Parallelism with Software Approaches . eliminate these 3 clock cycles we need to get more operations within the loop rel- . 3. Use different registers to avoid unnecessary constraints that would be forced by using the same registers for different computations. 4. Eliminate the extra test

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March 2018