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128 lines
5.1 KiB
HTML
128 lines
5.1 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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<!-- Copyright (C) 1988-2018 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 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Dump examples (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Dump examples (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Dump examples (GNU Compiler Collection (GCC) Internals)">
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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="Optimization-info.html#Optimization-info" rel="up" title="Optimization info">
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<link href="poly_005fint.html#poly_005fint" rel="next" title="poly_int">
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<link href="Dump-types.html#Dump-types" rel="prev" title="Dump types">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; 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">
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<a name="Dump-examples"></a>
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<div class="header">
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<p>
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Previous: <a href="Dump-types.html#Dump-types" accesskey="p" rel="prev">Dump types</a>, Up: <a href="Optimization-info.html#Optimization-info" accesskey="u" rel="up">Optimization info</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="Dump-examples-1"></a>
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<h4 class="subsection">9.6.6 Dump examples</h4>
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<a name="index-dump-examples"></a>
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<div class="smallexample">
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<pre class="smallexample">gcc -O3 -fopt-info-missed=missed.all
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</pre></div>
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<p>outputs missed optimization report from all the passes into
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<samp>missed.all</samp>.
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</p>
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<p>As another example,
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</p><div class="smallexample">
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<pre class="smallexample">gcc -O3 -fopt-info-inline-optimized-missed=inline.txt
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</pre></div>
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<p>will output information about missed optimizations as well as
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optimized locations from all the inlining passes into
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<samp>inline.txt</samp>.
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</p>
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<p>If the <var>filename</var> is provided, then the dumps from all the
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applicable optimizations are concatenated into the <samp>filename</samp>.
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Otherwise the dump is output onto <samp>stderr</samp>. If <var>options</var> is
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omitted, it defaults to <samp>optimized-optall</samp>, which means dump
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all information about successful optimizations from all the passes.
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In the following example, the optimization information is output on
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to <samp>stderr</samp>.
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</p>
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<div class="smallexample">
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<pre class="smallexample">gcc -O3 -fopt-info
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</pre></div>
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<p>Note that <samp>-fopt-info-vec-missed</samp> behaves the same as
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<samp>-fopt-info-missed-vec</samp>. The order of the optimization group
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names and message types listed after <samp>-fopt-info</samp> does not matter.
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</p>
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<p>As another example, consider
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</p>
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<div class="smallexample">
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<pre class="smallexample">gcc -fopt-info-vec-missed=vec.miss -fopt-info-loop-optimized=loop.opt
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</pre></div>
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<p>Here the two output file names <samp>vec.miss</samp> and <samp>loop.opt</samp> are
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in conflict since only one output file is allowed. In this case, only
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the first option takes effect and the subsequent options are
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ignored. Thus only the <samp>vec.miss</samp> is produced which containts
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dumps from the vectorizer about missed opportunities.
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</p>
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</body>
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</html>
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