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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ValueTracking] Add DemandedElts support to computeKnownBits/ComputeNumSignBits"
href="https://bugs.llvm.org/show_bug.cgi?id=36319">36319</a>
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<th>Summary</th>
<td>[ValueTracking] Add DemandedElts support to computeKnownBits/ComputeNumSignBits
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Common Code Generator Code
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>craig.topper@gmail.com, david.majnemer@gmail.com, efriedma@codeaurora.org, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<p>
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<pre>The addition of a DemandedElts mask helped a lot for vector types in
SelectionDAG::computeKnownBits and SelectionDAG::ComputeNumSignBits, notably
making it easier to determine bits for vector shuffles and element
insertions/extractions.
If possible it'd be great to bring this to ValueTracking as well to assist
InstCombine.</pre>
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