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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [DAGCombine] Add DemandedElts to SimplifyDemandedBits"
href="https://bugs.llvm.org/show_bug.cgi?id=40000">40000</a>
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<th>Summary</th>
<td>[DAGCombine] Add DemandedElts to SimplifyDemandedBits
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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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
</td>
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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>andrea.dibiagio@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<pre>We currently have 2 simplification combine helpers:
SimplifyDemandedBits - demand specific bits from every vector element (or
scalar)
SimplifyDemandedVectorElts - demand specific vector elements
This would be be a lot more powerful if we could merge these, adding a
DemandedElts argument to SimplifyDemandedBits and moving the
SimplifyDemandedVectorElts functionality into it as well.
This would also match what we've already done to computeKnownBits and
ComputeNumSignBits, allowing all of these functions to work together properly.</pre>
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