We couldn't use the name "libfixedpoint" because it would be terrible for SEO...

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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.