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Chapter 2 C and C++ Source-Level Optimizations 47
Software Optimization Guide for AMD64 Processors
25112 Rev. 3.06 September 2005
2.23 32-Bit Integral Data Types
Optimization
Use 32-bit integers instead of integers with smaller sizes (16-bit or 8-bit).
Application
This optimization applies to 32-bit software.
Rational
Be aware of the amount of storage associated with each integral data type.