Based on the algorithm published in:
Solving Kepler's equation CORDIC-like.
M. Zechmeister, 2018, A&A, 619, 128 [pdf], arXiv:1808.07062 [pdf]
Algorithms are available for
An online demo of normal CORDIC is here https://raw.githack.com/mzechmeister/ke/master/cordic/js/cordic.html