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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Command line parsing is slow"
href="http://llvm.org/bugs/show_bug.cgi?id=20999">20999</a>
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<th>Summary</th>
<td>Command line parsing is slow
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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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>Driver
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, rnk@google.com
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>I was looking at why test/Driver/response-file.c is slow. I found that given
300_000 options (just repeated -DTEST), the driver will call
llvm::opt::Option::matches about 349_802_000 times.
To reproduce, add a counter to llvm::opt::Option::matches and run
/bin/clang -E @..../response-file.c.tmp.1.txt response-file.c -###</pre>
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