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