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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Much slower compilation for proto code compared to LLVM3.2"
href="http://llvm.org/bugs/show_bug.cgi?id=18055">18055</a>
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<th>Summary</th>
<td>Much slower compilation for proto code compared to LLVM3.2
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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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>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bart@bartjanssens.org
</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=11607" name="attach_11607" title="Test case demonstrating the slowdown">attachment 11607</a> <a href="attachment.cgi?id=11607&action=edit" title="Test case demonstrating the slowdown">[details]</a></span>
Test case demonstrating the slowdown
Code extensively using the Boost Proto library compiles slower by a factor of 3
to 6 comparing clang 3.2 against clang 3.3 and 3.4. The attached preprocessed
code demonstrates the problem, running "clang++ -ftemplate-depth=512 proto.ii
-stdlib=libstdc++ -o proto":
Clang 3.2 (OS X binary from website):
1.49s user 0.11s system 93% cpu 1.712 total
Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn):
10.16s user 0.09s system 93% cpu 10.996 total
latest from git (reports clang version 3.5):
5.51s user 0.09s system 88% cpu 6.334 total</pre>
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