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Chapter 4 Exploiting Instruction Level Parallelism with Software Approaches. Basic Pipeline Scheduling and Loop Unrolling. To keep a pipeline full, parallelism among instructions must be exploited by find- ing sequences of unrelated instructions that can be overlapped in the pipeline. To avoid a pipeline stall, a dependent
Semester 2 2004. Software Approaches to Exploiting Instruction Level. Parallelism. Lecture notes by: David A. Patterson. Boris Savkovic. 1. Introduction. 2. Basic Pipeline Scheduling. 3. Instruction Level Parallelism and Dependencies. 4. Local Optimizations and Loops. 5. Global Scheduling Approaches. 6. HW Support for
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. – average dynamic branch frequency 15% to 25%. => 4 to 7 instructions execute between a pair of branches. – Plus instructions in BB likely to depend on each other.
Trace Cache. • Trace techniques are useful in software. • How about in hardware? • Addresses 2 problems in hardware: • How to find more instruction level parallelism? • How to avoid translation from x86 to microops? • Answer: Trace cache in Pentium 4
First universal ILP: pipelining (since 1985). 0. Two approaches to ILP. – Discover and exploit parallelism in hardware. 0. Dominant in server and desktop market segments. 0. Not used in PMD segment due to energy constraints. – May be changing with Cortex-A9. – Software-based discovery at compile time. 0. Technical
Chapter 4. Exploiting Instruction-Level Parallelism with Software Approaches. ???. ??????????. November 2004. EEF011 Computer Architecture. ?????
Pipelining become universal technique in 1985. ? Overlaps execution of instructions. ? Exploits “Instruction Level Parallelism (ILP)". ? Two main approaches: ? Dynamic > hardware-based. ? Used in server and desktop processors. ? Not used as extensively in Parallel Multiprogrammed. Microprocessors (PMP).
Chapter 3 Instruction-Level Parallelism and its Dynamic Exploitation this chapter could be understood without all of the ideas in Section 3.1, this basic material is important to later sections of this chapter as well as to chapter 4. There are two largely separable approaches to exploiting ILP. This chapter covers techniques that
Lecture 16: Instruction Level Parallelism. -- Dynamic Scheduling (OOO) via. Tomasulo's Approach. CSE 564 Computer Architecture Summer 2017. Department of Computer Science and. Engineering. Yonghong Yan yan@oakland.edu www.secs.oakland.edu/~yan
Exploits “Instruction Level Parallelism". ? Beyond this, there are two main approaches: ? Hardware-based dynamic approaches. ? Used in server and desktop processors. ? Not used as extensively in PMP processors. ? Compiler-based static approaches. ? Not as successful outside of scientific applications. Introduction
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