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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Extremely slow compilation in -O1 and -O2"
href="http://llvm.org/bugs/show_bug.cgi?id=16365">16365</a>
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<th>Summary</th>
<td>Extremely slow compilation in -O1 and -O2
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.2
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>Fons.Rademakers@cern.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10703" name="attach_10703" title="source file showing problem.">attachment 10703</a> <a href="attachment.cgi?id=10703&action=edit" title="source file showing problem.">[details]</a></span>
source file showing problem.
Very slow compilation of large but very simple source file.
$ time clang++ -O2 -c biggraph.C
real 1m21.025s
user 1m19.286s
sys 0m1.734s
$ time g++-4 -O2 -c biggraph.C [ g++ 4.8.1]
real 0m9.375s
user 0m9.191s
sys 0m0.176s</pre>
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