Note: QD is library for High-precison computing which has written by Yozo Hida, Xiaoye S. Li, David H. Bailey and others in LBNL.
This repository is UNOFFICIAL copy of official package to trace history.

This package supports both a double-double datatype (approx. 32 decimal digits) and a quad-double datatype (approx. 64 decimal digits). The computational library is written in C++. Both C++ and Fortran-90 high-level language interfaces are provided to permit one to use convert an existing C++ or Fortran-90 program to use the library with only minor changes to the source code. In most cases only a few type statements and (for Fortran-90 programs) read/write statements need to be changed. PSLQ and numerical quadrature programs are included.

It is 3-clause BSD license with LBNL clause.
For details, please read LBNL-BSD-License.doc and README file in package.

[High-Precision Software Directory (Official site)] (http://crd-legacy.lbl.gov/~dhbailey/mpdist/)