uutzinger / fastmath

fast inverse square root, example for C to Python bindings

fastmath

This was implemented to learn C bindings for python and to experiment with the fast inverse square root function

The fast inverse square root implementation in C is slower than value**-0.5 in Python. There is no speed increase from regular inverse square root to fast inverse square root.

Built with pybind11. This requires Python 3.7+.

Urs Utzinger 2023

Installation

• clone this repository
• pip install . or add -e switch to create symbolic links

Test

python
import fastmath
fastmath.invSqrt_fast(4.321)

Also check the tests folder.