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111 lines
5.9 KiB
HTML
111 lines
5.9 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>Assembly Coding (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 Coding (GNU MP 6.1.0)">
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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="Algorithms.html#Algorithms" rel="up" title="Algorithms">
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<link href="Assembly-Code-Organisation.html#Assembly-Code-Organisation" rel="next" title="Assembly Code Organisation">
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<link href="Random-Number-Algorithms.html#Random-Number-Algorithms" rel="prev" title="Random Number Algorithms">
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</head>
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<body lang="en">
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<a name="Assembly-Coding"></a>
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<div class="header">
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<p>
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Previous: <a href="Other-Algorithms.html#Other-Algorithms" accesskey="p" rel="prev">Other Algorithms</a>, Up: <a href="Algorithms.html#Algorithms" accesskey="u" rel="up">Algorithms</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="Assembly-Coding-1"></a>
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<h3 class="section">15.8 Assembly Coding</h3>
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<a name="index-Assembly-coding"></a>
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<p>The assembly subroutines in GMP are the most significant source of speed at
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small to moderate sizes. At larger sizes algorithm selection becomes more
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important, but of course speedups in low level routines will still speed up
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everything proportionally.
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</p>
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<p>Carry handling and widening multiplies that are important for GMP can’t be
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easily expressed in C. GCC <code>asm</code> blocks help a lot and are provided in
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<samp>longlong.h</samp>, but hand coding low level routines invariably offers a
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speedup over generic C by a factor of anything from 2 to 10.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Assembly-Code-Organisation.html#Assembly-Code-Organisation" accesskey="1">Assembly Code Organisation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Basics.html#Assembly-Basics" accesskey="2">Assembly Basics</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Carry-Propagation.html#Assembly-Carry-Propagation" accesskey="3">Assembly Carry Propagation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Cache-Handling.html#Assembly-Cache-Handling" accesskey="4">Assembly Cache Handling</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Functional-Units.html#Assembly-Functional-Units" accesskey="5">Assembly Functional Units</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Floating-Point.html#Assembly-Floating-Point" accesskey="6">Assembly Floating Point</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-SIMD-Instructions.html#Assembly-SIMD-Instructions" accesskey="7">Assembly SIMD Instructions</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Software-Pipelining.html#Assembly-Software-Pipelining" accesskey="8">Assembly Software Pipelining</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Loop-Unrolling.html#Assembly-Loop-Unrolling" accesskey="9">Assembly Loop Unrolling</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Assembly-Writing-Guide.html#Assembly-Writing-Guide">Assembly Writing Guide</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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</body>
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</html>
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