111 lines
5.1 KiB
HTML
111 lines
5.1 KiB
HTML
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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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<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>GNU Compiler Collection (GCC) Internals: LTO</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals: LTO">
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<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: LTO">
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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=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="LTO-Overview.html#LTO-Overview" rel="next" title="LTO Overview">
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<link href="Plugins-building.html#Plugins-building" rel="prev" title="Plugins building">
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<style type="text/css">
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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span.roman {font-family:serif; font-weight:normal}
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span.sansserif {font-family:sans-serif; font-weight:normal}
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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" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="LTO"></a>
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<div class="header">
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<p>
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Next: <a href="Match-and-Simplify.html#Match-and-Simplify" accesskey="n" rel="next">Match and Simplify</a>, Previous: <a href="Plugins.html#Plugins" accesskey="p" rel="prev">Plugins</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Link-Time-Optimization"></a>
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<h2 class="chapter">24 Link Time Optimization</h2>
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<a name="index-lto"></a>
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<a name="index-whopr"></a>
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<a name="index-wpa"></a>
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<a name="index-ltrans"></a>
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<p>Link Time Optimization (LTO) gives GCC the capability of
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dumping its internal representation (GIMPLE) to disk,
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so that all the different compilation units that make up
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a single executable can be optimized as a single module.
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This expands the scope of inter-procedural optimizations
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to encompass the whole program (or, rather, everything
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that is visible at link time).
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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="LTO-Overview.html#LTO-Overview" accesskey="1">LTO Overview</a>:</td><td> </td><td align="left" valign="top">Overview of LTO.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="LTO-object-file-layout.html#LTO-object-file-layout" accesskey="2">LTO object file layout</a>:</td><td> </td><td align="left" valign="top">LTO file sections in ELF.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="IPA.html#IPA" accesskey="3">IPA</a>:</td><td> </td><td align="left" valign="top">Using summary information in IPA passes.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="WHOPR.html#WHOPR" accesskey="4">WHOPR</a>:</td><td> </td><td align="left" valign="top">Whole program assumptions,
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linker plugin and symbol visibilities.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Internal-flags.html#Internal-flags" accesskey="5">Internal flags</a>:</td><td> </td><td align="left" valign="top">Internal flags controlling <code>lto1</code>.
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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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