qd ☆

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Description:
C++/Fortran-90 double-double and quad-double package

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: scientific-computing c-plus-plus fortran mathematics high-precision

Install: brew install qd

About:
Qd provides a comprehensive suite of C++ and Fortran-90 routines for performing floating-point arithmetic with double-double (approx. 106-bit) and quad-double (approx. 212-bit) precision. It is designed to serve as a robust software extension for achieving higher precision than standard IEEE 754 floating-point types, without requiring specialized hardware. The library is widely used in computational mathematics and scientific research for tasks demanding enhanced numerical accuracy and stability.

Key Features:

High-precision arithmetic in C++ and Fortran-90
Implements double-double and quad-double data types
Includes elementary functions and geometric routines
Designed for portability across standard computing platforms

Use Cases:

High-precision scientific computing and research
Validating algorithms developed with standard floating-point arithmetic
Solving numerical problems where standard precision is insufficient

Alternatives:

MPFR – MPFR provides arbitrary precision floating-point arithmetic, whereas Qd focuses specifically on fixed high-precision formats (double-double and quad-double) for performance.
Boost.Multiprecision – Boost offers a broader C++ library for various number types, while Qd is a specialized, lightweight solution for specific high-precision needs.

Version History

Detected	Version	Rev	Change	Commit
Sep 26, 2025 10:27pm		0	VERSION_BUMP	6ea59b86