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Chapter 2 C and C++ Source-Level Optimizations 9
Software Optimization Guide for AMD64 Processors
25112 Rev. 3.06 September 2005
2.1 Declarations of Floating-Point Values
Optimization
When working with single precision (float) values:
• Use the f or F suffix (for example, 3.14f) to specify a constant value of type float.
• Use function prototypes for all functions that accept arguments of type float.
Application
This optimization applies to:
• 32-bit software
• 64-bit software
Rationale
C and C++ compilers treat floating-point constants and arguments as double precision (double)
unless you specify otherwise. However, single precision floating-point values occupy half the
memory space as double precision values and can often provide the precision necessary for a given
computational problem.