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6 Introduction Chapter 1
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
1.5 Key Optimizations
While all of the optimizations in this guide help improve software performance, some of them have
more impact than others. Optimizations that offer the most improvement are called key optimizations.
Guideline
Concentrate your efforts on implementing key optimizations before moving on to other optimizations,
and incorporate higher-ranking key optimizations first.
Key Optimizations by Rank
Table 1 lists the key optimizations by rank.
Table 2. Optimizations by Rank
Rank Optimization Page
1 Memory-Size Mismatches 92
2 Natural Alignment of Data Objects 95
3 Memory Copy 120
4 Density of Branches 126
5 Prefetch Instructions 104
6 Two-Byte Near-Return RET Instruction 128
7 DirectPath Instructions 72
8 Load-Execute Integer Instructions 73
9 Load-Execute Floating-Point Instructions with Floating-Point Operands 74
10 Load-Execute Floating-Point Instructions with Integer Operands 74
11 Write-combining 113
12 Branches That Depend on Random Data 130
13 Half-Register Operations 356
14 Placing Code and Data in the Same 64-Byte Cache Line 116