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- <title>GIMPLE Tests (GNU Compiler Collection (GCC) Internals)</title>
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- <a name="GIMPLE-Tests"></a>
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- Next: <a href="RTL-Tests.html#RTL-Tests" accesskey="n" rel="next">RTL Tests</a>, Previous: <a href="Torture-Tests.html#Torture-Tests" accesskey="p" rel="prev">Torture Tests</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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- <a name="Support-for-testing-GIMPLE-passes"></a>
- <h3 class="section">7.10 Support for testing GIMPLE passes</h3>
-
- <p>As of gcc 7, C functions can be tagged with <code>__GIMPLE</code> to indicate
- that the function body will be GIMPLE, rather than C. The compiler requires
- the option <samp>-fgimple</samp> to enable this functionality. For example:
- </p>
- <div class="smallexample">
- <pre class="smallexample">/* { dg-do compile } */
- /* { dg-options "-O -fgimple" } */
-
- void __GIMPLE (startwith ("dse2")) foo ()
- {
- int a;
-
- bb_2:
- if (a > 4)
- goto bb_3;
- else
- goto bb_4;
-
- bb_3:
- a_2 = 10;
- goto bb_5;
-
- bb_4:
- a_3 = 20;
-
- bb_5:
- a_1 = __PHI (bb_3: a_2, bb_4: a_3);
- a_4 = a_1 + 4;
-
- return;
- }
- </pre></div>
-
- <p>The <code>startwith</code> argument indicates at which pass to begin.
- </p>
- <p>Use the dump modifier <code>-gimple</code> (e.g. <samp>-fdump-tree-all-gimple</samp>)
- to make tree dumps more closely follow the format accepted by the GIMPLE
- parser.
- </p>
- <p>Example DejaGnu tests of GIMPLE can be seen in the source tree at
- <samp>gcc/testsuite/gcc.dg/gimplefe-*.c</samp>.
- </p>
- <p>The <code>__GIMPLE</code> parser is integrated with the C tokenizer and
- preprocessor, so it should be possible to use macros to build out
- test coverage.
- </p>
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