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<a name="GIMPLE-Tests"></a>
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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 &quot;-O -fgimple&quot; } */

void __GIMPLE (startwith (&quot;dse2&quot;)) foo ()
{
  int a;

bb_2:
  if (a &gt; 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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