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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Optimizer taking ~forever"
href="https://bugs.llvm.org/show_bug.cgi?id=50724">50724</a>
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<th>Summary</th>
<td>Optimizer taking ~forever
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>12.0
</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>
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<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>dave@boostpro.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24956" name="attach_24956" title="Single source file">attachment 24956</a> <a href="attachment.cgi?id=24956&action=edit" title="Single source file">[details]</a></span>
Single source file
/tmp ยป clang++ --version
Apple clang version 12.0.5 (clang-1205.0.22.9)
Target: x86_64-apple-darwin20.5.0
Thread model: posix
'clang++' '-O0' -std=c++11 'gen.cpp' '-o' 'gen.cpp.out' 1.16s user 0.07s
system 98% cpu 1.241 total
'clang++' '-O1' -std=c++11 'gen.cpp' '-o' 'gen.cpp.out' 11.30s user 0.27s
system 99% cpu 11.579 total
'clang++' '-O2' -std=c++11 'gen.cpp' '-o' 'gen.cpp.out' 288.87s user 8.46s
system 99% cpu 4:57.36 total
The attached program takes a really long time to optimize; I think clang should
do better.</pre>
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