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Chapter 8 Integer Optimizations 159
Software Optimization Guide for AMD64 Processors
25112 Rev. 3.06 September 2005
Chapter 8 Integer Optimizations
The optimizations in this chapter help improve integer performance.
This chapter covers the following topics:
Topic Page
Replacing Division with Multiplication 160
Alternative Code for Multiplying by a Constant 164
Repeated String Instructions 167
Using XOR to Clear Integer Registers 169
Efficient 64-Bit Integer Arithmetic in 32-Bit Mode 170
Efficient Implementation of Population-Count Function in 32-Bit Mode 179
Efficient Binary-to-ASCII Decimal Conversion 181
Derivation of Algorithm, Multiplier, and Shift Factor for Integer Division by Constants 186
Optimizing Integer Division 192