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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - TargetLowering::SimplifyDemandedBits - improve vector support"
href="https://bugs.llvm.org/show_bug.cgi?id=39689">39689</a>
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<th>Summary</th>
<td>TargetLowering::SimplifyDemandedBits - improve vector support
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</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
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<th>Component</th>
<td>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<th>Blocks</th>
<td>39549
</td>
</tr></table>
<p>
<div>
<pre>We need to improve vector type support in SimplifyDemandedBits:
ISD::TRUNCATE (DAGCombiner.visitTRUNCATE currently disables this)
ISD::EXTRACT_VECTOR_ELT
ISD::INSERT_VECTOR_ELT
ISD::SCALAR_TO_VECTOR
ISD::VECTOR_SHUFFLE</pre>
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</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] SimplifyDemandedBits fails to remove a zero vector input from unpckh"
href="https://bugs.llvm.org/show_bug.cgi?id=39549">Bug 39549</a>] [X86] SimplifyDemandedBits fails to remove a zero vector input from unpckh
</li>
</ul>
</div>
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