Algorithms for quad-double precision floating point arithmetic
Yozo Hida, X.S. Li, David H. Bailey · 2002
A quad-double number is an unevaluated sum of four IEEE double precision numbers, capable of representing at least 212 bits of significand. We present the algorithms for various arithmetic operations (including the four basic operations and various algebraic and transcendental operations) on quad-double numbers. The performance of the algorithms, implemented in C++, is also presented.