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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - A very small test resulting in extremely long compilation in "clang -O2" version 3.5, trunk 199677"
href="http://llvm.org/bugs/show_bug.cgi?id=18606">18606</a>
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<th>Summary</th>
<td>A very small test resulting in extremely long compilation in "clang -O2" version 3.5, trunk 199677
</td>
</tr>
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<th>Product</th>
<td>tools
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>opt
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mohammad.r.haghighat@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11934" name="attach_11934" title="Sources of t27056 test including its source, input, and outputs">attachment 11934</a> <a href="attachment.cgi?id=11934&action=edit" title="Sources of t27056 test including its source, input, and outputs">[details]</a></span>
Sources of t27056 test including its source, input, and outputs
This is one of the tests generated by icFuzz in the attachment of comment
<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [icFuzz] Incorrect results at -O2 optimization and infinite loop in the Clang optimizer"
href="show_bug.cgi?id=16431#c30">http://llvm.org/bugs/show_bug.cgi?id=16431#c30</a>
the test resuls in an extremely long compilation in clang version 3.5, trunk
199677. Clang -O2 compilation seems to run until it goes out of memory. The
core of the test is very simple:
for (kj = 1; kj < 2; ++kj) {
for (jd = 1; jd < 32; ++jd) {
zz *= zz;
}
}
I guess the problem is a result of unrolling and creating a sequence of
statements that result in analysis nodes that have exponential complexity. If
the 2nd loop upper bound (32) is changed to a larger number (e.g., 132) or a
much smaller number (e.g., 12), compilation terminates fast.</pre>
</div>
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