Chapter 4 Introduction
Chapter 4 Introduction
Chapter 4 Introduction
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Morgan Kaufmann Publishers 31 January 2013Fallaciesn Pipelining is easy (!)n The basic idea is easynThe devil is in the detailsn e.g., detecting data hazardsn Pipelining is independent of technologyn So why haven’t we always done pipelining?nnMore transistors make more advanced techniquesfeasiblePipeline-related ISA design needs to take account oftechnology trendsn e.g., predicated instructions§4.13 Fallacies and PitfallsCSE 420 <strong>Chapter</strong> 4 — The Processor — 129Pitfallsn Poor ISA design can make pipelininghardern e.g., complex instruction sets (VAX, IA-32)n Significant overhead to make pipelining workn IA-32 micro-op approachn e.g., complex addressing modesn Register update side effects, memory indirectionn e.g., delayed branchesn Advanced pipelines have long delay slotsCSE 420 <strong>Chapter</strong> 4 — The Processor — 130
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