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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - GlobalISel: Implement support for obtaining known bits information"
href="https://bugs.llvm.org/show_bug.cgi?id=38367">38367</a>
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<th>Summary</th>
<td>GlobalISel: Implement support for obtaining known bits information
</td>
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<th>Product</th>
<td>libraries
</td>
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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>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
</td>
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<th>Component</th>
<td>GlobalISel
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>aemerson@apple.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Some optimizations require the knowledge of which bits in a value are known to
be 1 or 0, and do this by using the computeKnownBits() capability for
SelectionDAG nodes. We will need some way of getting the same information. In
an ideal scenario the replacement infrastructure for this will be more
efficient, as this part of the codebase seems to be disproportionately
responsible for pathological compile time regressions.</pre>
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