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30 C and C++ Source-Level Optimizations Chapter 2
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
2.13 Use of const Type Qualifier
Optimization
For objects whose values will not be changed, use the const type qualifier.
Application
This optimization applies to:
• 32-bit software
• 64-bit software
Rationale
Using the const type qualifier makes code more robust and may enable the compiler to generate
higher-performance code. For example, under the C standard, a compiler is not required to allocate
storage for an object that is declared const, if its address is never used.