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93 lines
4.2 KiB
HTML
93 lines
4.2 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>Assembly Code Organisation (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="Assembly Code Organisation (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="Assembly-Coding.html#Assembly-Coding" rel="up" title="Assembly Coding">
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<link href="Assembly-Basics.html#Assembly-Basics" rel="next" title="Assembly Basics">
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<link href="Assembly-Coding.html#Assembly-Coding" rel="prev" title="Assembly Coding">
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<style type="text/css">
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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="Assembly-Code-Organisation"></a>
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<div class="header">
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<p>
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Next: <a href="Assembly-Basics.html#Assembly-Basics" accesskey="n" rel="next">Assembly Basics</a>, Previous: <a href="Assembly-Coding.html#Assembly-Coding" accesskey="p" rel="prev">Assembly Coding</a>, Up: <a href="Assembly-Coding.html#Assembly-Coding" accesskey="u" rel="up">Assembly Coding</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="Code-Organisation"></a>
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<h4 class="subsection">15.8.1 Code Organisation</h4>
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<a name="index-Assembly-code-organisation"></a>
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<a name="index-Code-organisation"></a>
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<p>The various <samp>mpn</samp> subdirectories contain machine-dependent code, written
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in C or assembly. The <samp>mpn/generic</samp> subdirectory contains default code,
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used when there’s no machine-specific version of a particular file.
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</p>
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<p>Each <samp>mpn</samp> subdirectory is for an ISA family. Generally 32-bit and
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64-bit variants in a family cannot share code and have separate directories.
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Within a family further subdirectories may exist for CPU variants.
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</p>
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<p>In each directory a <samp>nails</samp> subdirectory may exist, holding code with
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nails support for that CPU variant. A <code>NAILS_SUPPORT</code> directive in each
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file indicates the nails values the code handles. Nails code only exists
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where it’s faster, or promises to be faster, than plain code. There’s no
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effort put into nails if they’re not going to enhance a given CPU.
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</p>
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</body>
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</html>
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