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**GNU Multiple Precision Arithmetic Library** (**GMP**) is a free library for arbitrary-precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers.^{[3]} There are no practical limits to the precision except the ones implied by the available memory (operands may be of up to 2^{32}−1 bits on 32-bit machines and 2^{37} bits on 64-bit machines).^{[4]}^{[5]} GMP has a rich set of functions, and the functions have a regular interface. The basic interface is for C, but wrappers exist for other languages, including Ada, C++, C#, Julia, .NET, OCaml, Perl, PHP, Python, R, Ruby, and Rust. Prior to 2008, Kaffe, a Java virtual machine, used GMP to support Java built-in arbitrary precision arithmetic.^{[6]} Shortly after, GMP support was added to GNU Classpath.^{[7]}

Developer(s) | GNU Project |
---|---|

Initial release | 1991^{[1]} |

Stable release | 6.2.1 ^{[2]}
/ 14 November 2020 |

Repository | gmplib |

Written in | C, (C++, assembly optionally) |

Type | Mathematical software |

License | Dual LGPLv3 and GPLv2^{[3]} |

Website | gmplib |

The main target applications of GMP are cryptography applications and research, Internet security applications, and computer algebra systems.

GMP aims to be faster than any other bignum library for all operand sizes. Some important factors in doing this are:

- Using full words as the basic arithmetic type.
- Using different algorithms for different operand sizes; algorithms that are faster for very big numbers are usually slower for small numbers.
- Highly optimized assembly language code for the most important inner loops, specialized for different processors.

The first GMP release was made in 1991. It is constantly developed and maintained.^{[8]}

GMP is part of the GNU project (although its website being off gnu.org may cause confusion), and is distributed under the GNU Lesser General Public License (LGPL).

GMP is used for integer arithmetic in many computer algebra systems such as Mathematica^{[9]} and Maple.^{[10]} It is also used in the Computational Geometry Algorithms Library (CGAL).

GMP is needed to build the GNU Compiler Collection (GCC).^{[11]}

Here is an example of C code showing the use of the GMP library to multiply and print large numbers:

```
#include <stdio.h>
#include <gmp.h>
int main(void) {
mpz_t x, y, result;
mpz_init_set_str(x, "7612058254738945", 10);
mpz_init_set_str(y, "9263591128439081", 10);
mpz_init(result);
mpz_mul(result, x, y);
gmp_printf(" %Zd\n"
"*\n"
" %Zd\n"
"--------------------\n"
"%Zd\n", x, y, result);
/* free used memory */
mpz_clear(x);
mpz_clear(y);
mpz_clear(result);
return 0;
}
```

This code calculates the value of 7612058254738945 × 9263591128439081.

Compiling and running this program gives this result. (The `-lgmp`

flag is used if compiling on Unix-type systems.)

```
7612058254738945
*
9263591128439081
--------------------
70514995317761165008628990709545
```

For comparison, one can write instead the following equivalent C++ program. (The `-lgmpxx -lgmp`

flags are used if compiling on Unix-type systems.)

```
#include <iostream>
#include <gmpxx.h>
int main() {
mpz_class x("7612058254738945");
mpz_class y("9263591128439081");
std::cout << " " << x << "\n"
<< "*\n"
<< " " << y << "\n"
<< "--------------------\n"
<< x * y << "\n";
return 0;
}
```

Library name | Language | License |
---|---|---|

GNU Multi-Precision Library | C, C++ | LGPL |

Math::GMP | Perl | LGPL |

Math::GMPz, Math::GMPf and Math::GMPq | Perl | Artistic License v1.0 + GPL v1.0-or-later |

General Multiprecision Python Project | Python | LGPL |

R package 'gmp' | R | GPL |

The RubyGems project | Ruby | Apache 2.0 |

Rust FFI bindings for GMP, MPFR and MPC | Rust | LGPL |

GNU Multi-Precision Library for PHP | PHP | PHP |

GNU Multi-Precision Routines for SBCL | Common Lisp | Public Domain |

Ch GMP | Ch | Proprietary |

Parallel GMP Wrapper for BMDFM | BMDFM LISP / C | Public Domain |

Glasgow Haskell Compiler (The implementation of `Integer` is basically a binding to GMP) |
Haskell | BSD |

luajit-gmp | LuaJIT | MIT |

gmp-wrapper-for-delphi | Delphi | MIT |

Zarith | OCaml | LGPL |

Math.Gmp.Native Library | .NET | MIT |

nim-gmp | Nim | MIT |

**^**"GNU MP archive". Retrieved 2018-12-03.**^**"GMP 6.2.1 released"; author name string: Marco Bodrato; publication date: 14 November 2020; retrieved: 15 November 2020.- ^
^{a}^{b}"What is GMP?". Retrieved 2014-04-07. **^**Granlund, Torbjorn (2009-07-06). "Problems with mpz_set_str and huge strings". Retrieved 2013-03-17.**^**"GMP 6.0 News". Retrieved 2019-10-04.**^**Hughes, Andrew John (2008-02-28). "Removed GMP math?". Retrieved 2013-03-17.**^**"GNU Classpath 0.98 "Better Late Than Never"". 2009-02-05. Retrieved 2013-03-17.**^**"GNU MP Bignum Library". Retrieved 2018-12-03.**^**"The Mathematica Kernel: Issues in the Design and Implementation". October 2006. Retrieved 2013-03-17.**^**"The GNU Multiple Precision (GMP) Library". Maplesoft. Retrieved 2013-03-17.**^**GCC uses the GNU MPFR library, which in turn relies on GMP. "GCC 4.3 Release Series: Changes, New Features, and Fixes". 2012-11-02. Retrieved 2013-03-17.

- Official website