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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Instcombine breaks apart std::clamp, X86 backend is unable to reconstruct"
href="https://bugs.llvm.org/show_bug.cgi?id=52205">52205</a>
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<th>Summary</th>
<td>Instcombine breaks apart std::clamp, X86 backend is unable to reconstruct
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</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>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>-stdlib=libc++ isn't important here, there's some phase ordering behaviour
that prevents the issue with libstdc++ on the snippet, but not on the orig src.
<a href="https://godbolt.org/z/qhhWW74Tf">https://godbolt.org/z/qhhWW74Tf</a>
It sunk trunc into the last select,
and skipped non-sign-changing ashr in the first comparison.</pre>
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</p>
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