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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang-format takes a long time (~18 s) to process a simple file"
href="https://llvm.org/bugs/show_bug.cgi?id=29014">29014</a>
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<th>Summary</th>
<td>clang-format takes a long time (~18 s) to process a simple file
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</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>
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<th>Component</th>
<td>Formatter
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sylvestre@debian.org
</td>
</tr>
<tr>
<th>CC</th>
<td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16973" name="attach_16973" title="Example">attachment 16973</a> <a href="attachment.cgi?id=16973&action=edit" title="Example">[details]</a></span>
Example
Running clang-format trunk on 1780 lines takes about 20 seconds.
I guess we have an algorithm with a too important complexity
$ time clang-format-4.0 -i nsUnicodePropertyData.cpp
real 0m17.153s
user 0m14.480s
sys 0m2.668s
On a recent and powerful system
The file contains many big arrays.</pre>
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