We couldn't use the name "libfixedpoint" because it would be terrible for SEO...
This is a portable C++ library for fixed-point decimals. It was originally developed as part of the NoisePage database project at Carnegie Mellon University.
This library implements decimals as 128-bit integers and stores them in scaled format. For example, it will store the decimal 12.23 with scale 5 1223000.
Addition and subtraction operations require two decimals of the same scale. Decimal multiplication accepts an argument of lower scale and returns a decimal in the higher scale. Decimal division accepts an argument of the denominator scale and returns the decimal in numerator scale. A rescale decimal function is also provided.
The following files are included:
decimal.cpp- The core fixed decimal package supporting decimals with fixed precision(38) and a max scale of 38.decimal_multiplication_generator.py- Generates tests for the multiplication operations.magic_number_generator.py- To optimize multiplication and division with specific constants we can generate precompiled constats to speed it up.