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157 lines
6.9 KiB
HTML
157 lines
6.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual describes how to install and use the GNU multiple precision
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arithmetic library, version 6.1.0.
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Copyright 1991, 1993-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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the terms of the GNU Free Documentation License, Version 1.3 or any later
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version published by the Free Software Foundation; with no Invariant Sections,
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with the Front-Cover Texts being "A GNU Manual", and with the Back-Cover
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Texts being "You have freedom to copy and modify this GNU Manual, like GNU
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software". A copy of the license is included in
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GNU Free Documentation License. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Introduction to GMP (GNU MP 6.1.0)</title>
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<meta name="description" content="How to install and use the GNU multiple precision arithmetic library, version 6.1.0.">
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<meta name="keywords" content="Introduction to GMP (GNU MP 6.1.0)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="Installing-GMP.html#Installing-GMP" rel="next" title="Installing GMP">
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<link href="Copying.html#Copying" rel="prev" title="Copying">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Introduction-to-GMP"></a>
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<div class="header">
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<p>
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Next: <a href="Installing-GMP.html#Installing-GMP" accesskey="n" rel="next">Installing GMP</a>, Previous: <a href="Copying.html#Copying" accesskey="p" rel="prev">Copying</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Introduction-to-GNU-MP"></a>
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<h2 class="chapter">1 Introduction to GNU MP</h2>
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<a name="index-Introduction"></a>
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<p>GNU MP is a portable library written in C for arbitrary precision arithmetic
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on integers, rational numbers, and floating-point numbers. It aims to provide
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the fastest possible arithmetic for all applications that need higher
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precision than is directly supported by the basic C types.
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</p>
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<p>Many applications use just a few hundred bits of precision; but some
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applications may need thousands or even millions of bits. GMP is designed to
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give good performance for both, by choosing algorithms based on the sizes of
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the operands, and by carefully keeping the overhead at a minimum.
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</p>
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<p>The speed of GMP is achieved by using fullwords as the basic arithmetic type,
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by using sophisticated algorithms, by including carefully optimized assembly
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code for the most common inner loops for many different CPUs, and by a general
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emphasis on speed (as opposed to simplicity or elegance).
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</p>
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<p>There is assembly code for these CPUs:
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<a name="index-CPU-types"></a>
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ARM Cortex-A9, Cortex-A15, and generic ARM,
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DEC Alpha 21064, 21164, and 21264,
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AMD K8 and K10 (sold under many brands, e.g. Athlon64, Phenom, Opteron)
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Bulldozer, and Bobcat,
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Intel Pentium, Pentium Pro/II/III, Pentium 4, Core2, Nehalem, Sandy bridge, Haswell, generic x86,
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Intel IA-64,
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Motorola/IBM PowerPC 32 and 64 such as POWER970, POWER5, POWER6, and POWER7,
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MIPS 32-bit and 64-bit,
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SPARC 32-bit ad 64-bit with special support for all UltraSPARC models.
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There is also assembly code for many obsolete CPUs.
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</p>
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<a name="index-Home-page"></a>
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<a name="index-Web-page"></a>
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<p>For up-to-date information on GMP, please see the GMP web pages at
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</p>
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<div class="display">
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<pre class="display"><a href="https://gmplib.org/">https://gmplib.org/</a>
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</pre></div>
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<a name="index-Latest-version-of-GMP"></a>
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<a name="index-Anonymous-FTP-of-latest-version"></a>
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<a name="index-FTP-of-latest-version"></a>
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<p>The latest version of the library is available at
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</p>
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<div class="display">
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<pre class="display"><a href="https://ftp.gnu.org/gnu/gmp/">https://ftp.gnu.org/gnu/gmp/</a>
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</pre></div>
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<p>Many sites around the world mirror ‘<samp>ftp.gnu.org</samp>’, please use a mirror
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near you, see <a href="https://www.gnu.org/order/ftp.html">https://www.gnu.org/order/ftp.html</a> for a full list.
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</p>
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<a name="index-Mailing-lists"></a>
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<p>There are three public mailing lists of interest. One for release
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announcements, one for general questions and discussions about usage of the GMP
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library and one for bug reports. For more information, see
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</p>
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<div class="display">
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<pre class="display"><a href="https://gmplib.org/mailman/listinfo/">https://gmplib.org/mailman/listinfo/</a>.
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</pre></div>
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<p>The proper place for bug reports is <a href="mailto:gmp-bugs@gmplib.org">gmp-bugs@gmplib.org</a>. See
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<a href="Reporting-Bugs.html#Reporting-Bugs">Reporting Bugs</a> for information about reporting bugs.
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</p>
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<br>
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<a name="How-to-use-this-Manual"></a>
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<h3 class="section">1.1 How to use this Manual</h3>
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<a name="index-About-this-manual"></a>
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<p>Everyone should read <a href="GMP-Basics.html#GMP-Basics">GMP Basics</a>. If you need to install the library
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yourself, then read <a href="Installing-GMP.html#Installing-GMP">Installing GMP</a>. If you have a system with multiple
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ABIs, then read <a href="ABI-and-ISA.html#ABI-and-ISA">ABI and ISA</a>, for the compiler options that must be used
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on applications.
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</p>
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<p>The rest of the manual can be used for later reference, although it is
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probably a good idea to glance through it.
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</p>
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<hr>
|
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|
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<div class="header">
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|
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<p>
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Next: <a href="Installing-GMP.html#Installing-GMP" accesskey="n" rel="next">Installing GMP</a>, Previous: <a href="Copying.html#Copying" accesskey="p" rel="prev">Copying</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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