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46 C and C++ Source-Level Optimizations Chapter 2
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
2.22 Array Indices
Optimization
The preferred type for array indices is ptrdiff_t.
Application
This optimization applies to:
• 32-bit software
• 64-bit software
Rationale
Array indices are often used with pointers while doing arithmetic. Using ptrdiff_t produces more
portable code and will generally provide good performance.