Libfixmath

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libfixmath

Developer(s)	Ben Brewer
Stable release	r64 / February 2, 2012; 13 years ago (2012-02-02)
Repository	code.google.com/archive/p/libfixmath/source/default/source
Written in	C99
Operating system	Cross-platform
Type	fixed-point math library
License	MIT
Website	code.google.com/p/libfixmath

libfixmath is a platform-independent fixed-point math library aimed at developers wanting to perform fast non-integer math on platforms lacking a (or with a low performance) FPU. It offers developers a similar interface to the standard math.h functions for use on Q16.16 fixed-point numbers. libfixmath has no external dependencies other than stdint.h and a compiler which supports 64-bit integer arithmetic (such as GCC).^[1] Conditional compilation options exist to remove the requirement for a 64-bit capable compiler as many compilers for microcontrollers and DSPs do not support 64-bit arithmetic.^[2]

libfixmath was developed by Ben Brewer and first released publicly as part of the Dingoo SDK.^[3] It has since been used to implement a software 3D graphics library called FGL.^[4]

For the most intensive function (atan2) benchmark results show the following results:

Note: These results were calculated using fixtest with caching optimizations turned off.^[5]

libfixmath is released under the MIT License, a permissive free software licence, and is free software.

• Binary scaling
• Fixed-point arithmetic
• Floating-point arithmetic
• Q (number format)

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