136 lines
5.4 KiB
HTML
136 lines
5.4 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: profopt Testing</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals: profopt Testing">
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<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: profopt Testing">
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<meta name="distribution" content="global">
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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="Testsuites.html#Testsuites" rel="up" title="Testsuites">
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<link href="compat-Testing.html#compat-Testing" rel="next" title="compat Testing">
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<link href="gcov-Testing.html#gcov-Testing" rel="prev" title="gcov Testing">
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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="profopt-Testing"></a>
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<div class="header">
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<p>
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Next: <a href="compat-Testing.html#compat-Testing" accesskey="n" rel="next">compat Testing</a>, Previous: <a href="gcov-Testing.html#gcov-Testing" accesskey="p" rel="prev">gcov Testing</a>, Up: <a href="Testsuites.html#Testsuites" accesskey="u" rel="up">Testsuites</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="Support-for-testing-profile_002ddirected-optimizations"></a>
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<h3 class="section">7.8 Support for testing profile-directed optimizations</h3>
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<p>The file <samp>profopt.exp</samp> provides language-independent support for
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checking correct execution of a test built with profile-directed
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optimization. This testing requires that a test program be built and
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executed twice. The first time it is compiled to generate profile
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data, and the second time it is compiled to use the data that was
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generated during the first execution. The second execution is to
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verify that the test produces the expected results.
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</p>
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<p>To check that the optimization actually generated better code, a
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test can be built and run a third time with normal optimizations to
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verify that the performance is better with the profile-directed
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optimizations. <samp>profopt.exp</samp> has the beginnings of this kind
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of support.
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</p>
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<p><samp>profopt.exp</samp> provides generic support for profile-directed
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optimizations. Each set of tests that uses it provides information
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about a specific optimization:
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</p>
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<dl compact="compact">
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<dt><code>tool</code></dt>
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<dd><p>tool being tested, e.g., <code>gcc</code>
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</p>
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</dd>
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<dt><code>profile_option</code></dt>
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<dd><p>options used to generate profile data
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</p>
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</dd>
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<dt><code>feedback_option</code></dt>
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<dd><p>options used to optimize using that profile data
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</p>
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</dd>
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<dt><code>prof_ext</code></dt>
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<dd><p>suffix of profile data files
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</p>
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</dd>
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<dt><code>PROFOPT_OPTIONS</code></dt>
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<dd><p>list of options with which to run each test, similar to the lists for
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torture tests
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</p>
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</dd>
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<dt><code>{ dg-final-generate { <var>local-directive</var> } }</code></dt>
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<dd><p>This directive is similar to <code>dg-final</code>, but the
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<var>local-directive</var> is run after the generation of profile data.
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</p>
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</dd>
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<dt><code>{ dg-final-use { <var>local-directive</var> } }</code></dt>
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<dd><p>The <var>local-directive</var> is run after the profile data have been
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used.
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</p></dd>
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</dl>
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</body>
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</html>
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