Use vrsqrts for rsqrt Newton iterations. It's slightly faster and slightly more accurate, allowing our current packetmath tests to pass for sqrt with a single iteration.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.