Crate efloat [−] [src]

efloat

This is a floating point type that remembers how far off it might be from the actual precise value, based on it's history. It keeps and upper and lower error bound internally, and you can check those with function calls.

Here are a few tips:

Multiplication and division don't cause too much error.
Addition is ok, but subtraction (or addition of differing signs) has a terrible error bound.
Operate on small numbers first, working up, so that the larger errors don't propogate and grow as much.

Logic taken from pbrt-v3: https://github.com/mmp/pbrt-v3 (efloat.h class) by Matt Pharr, Greg Humphreys, and Wenzel Jakob.

Structs

EFloat32

This is a floating point type that remembers how far off it might be from the actual precise value, based on it's history. It keeps and upper and lower error bound internally, and you can check those with function calls.