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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Merge 00f3579aea6e3d4a4b7464c3db47294f71cef9e4 to 11.0"
href="https://bugs.llvm.org/show_bug.cgi?id=46740">46740</a>
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<th>Summary</th>
<td>Merge 00f3579aea6e3d4a4b7464c3db47294f71cef9e4 to 11.0
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>craig.topper@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>This reverts most of a 5 patch series due to reports of miscompiles.
The patches are
1cf6f210a2e [IR] Disable select ? C : undef -> C fold in
ConstantFoldSelectInstruction unless we know C isn't poison.
469da663f2d [InstSimplify] Re-enable select ?, undef, X -> X transform when
X is provably not poison
122b0640fc9 [InstSimplify] Don't fold vectors of partial undef in
SimplifySelectInst if the non-undef element value might produce poison
ac0af12ed2f [InstSimplify] Add test cases for opportunities to fold select
?, X, undef -> X when we can prove X isn't poison
9b1e95329af [InstSimplify] Remove select ?, undef, X -> X and select ?, X,
undef -> X transforms
Some of them added new test cases which I left but change the CHECK lines.</pre>
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