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96 lines
4.2 KiB
HTML
96 lines
4.2 KiB
HTML
4 years ago
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<title>profopt Testing - GNU Compiler Collection (GCC) Internals</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link rel="up" href="Testsuites.html#Testsuites" title="Testsuites">
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<link rel="prev" href="gcov-Testing.html#gcov-Testing" title="gcov Testing">
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<link rel="next" href="compat-Testing.html#compat-Testing" title="compat Testing">
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Copyright (C) 1988-2015 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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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<body>
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<div class="node">
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<a name="profopt-Testing"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="compat-Testing.html#compat-Testing">compat Testing</a>,
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Previous: <a rel="previous" accesskey="p" href="gcov-Testing.html#gcov-Testing">gcov Testing</a>,
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Up: <a rel="up" accesskey="u" href="Testsuites.html#Testsuites">Testsuites</a>
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<hr>
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</div>
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<h3 class="section">7.8 Support for testing profile-directed optimizations</h3>
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<p>The file <samp><span class="file">profopt.exp</span></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>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><span class="file">profopt.exp</span></samp> has the beginnings of this kind
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of support.
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<p><samp><span class="file">profopt.exp</span></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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<dl>
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<dt><code>tool</code><dd>tool being tested, e.g., <samp><span class="command">gcc</span></samp>
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<br><dt><code>profile_option</code><dd>options used to generate profile data
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<br><dt><code>feedback_option</code><dd>options used to optimize using that profile data
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<br><dt><code>prof_ext</code><dd>suffix of profile data files
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<br><dt><code>PROFOPT_OPTIONS</code><dd>list of options with which to run each test, similar to the lists for
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torture tests
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<br><dt><code>{ dg-final-generate { </code><var>local-directive</var><code> } }</code><dd>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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<br><dt><code>{ dg-final-use { </code><var>local-directive</var><code> } }</code><dd>The <var>local-directive</var> is run after the profile data have been
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used.
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</dl>
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</body></html>
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