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Next: <a rel="next" accesskey="n" href="compat-Testing.html#compat-Testing">compat Testing</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><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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