High-Precision Software Directory

Update: 15 June 2015

This web site (see software package links below) contains the LBNL double-double precision, quad-double precision and arbitrary precision (also termed "multiprecision" or "multiple precision") software, which was written over a period of several years by David H. Bailey (LBNL), Yozo Hida (U.C. Berkeley), Xiaoye S. Li (LBNL), Brandon Thompson (formerly of U.C. Berkeley, now at Synopsis), Karthik Jeyabalan (formerly at LBNL, now at Cornell) and Alex Kaiser (LBNL, now at NYU). Here are links to some of the authors' websites:

*** IMPORTANT NOTE *** By downloading or using this software you are agreeing to the modified BSD license that is in file BSD-LBNL-License.doc and in the packages below. If you wish to use the software for commercial purposes please contact the LBNL Technology Transfer Department at TTD@lbl.gov or call 510-286-6457. Please send any comments or questions for this site to:

Here are the software packages that are available: