I am looking for a free C++ fixed point library (Mainly for use with embedded devices, not for arbitrary precision math). Basically, the requirements are:
- No unnecessary runtime overhead: whatever can be done at compile time, should be done at compile time.
- Ability to transparently switch code between fixed and floating point, with no inherent overhead.
- Fixed point math functions. There's no much point using fixed point if you need to cast back and forth in order to take a square root.
- Small footprint.
Any suggestions?
Answer
There is an open-source fixed point math library project which can be found by following the links below:
It is a C static library with a C++ class interface for C++ users, it implements the following functionality: Trig. Functions: sin, cos, tan, asin, acos, atan, atan2 Saturated Arithmetic: sadd, ssub, smul, sdiv Other Functions: sqrt, exp
It only supports 16.16 fixed-point datatype.
It is an actively developed open-source project (looking for interested developers).