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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [guards] canonicalize guards in instcombine"
href="https://llvm.org/bugs/show_bug.cgi?id=31520">31520</a>
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<th>Summary</th>
<td>[guards] canonicalize guards in instcombine
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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>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>listmail@philipreames.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>At the moment, instcombine is missing any knowledge of the
llvm.experimental.guard intrinsics. We should implement canonicalization rules
similar to those used for instcombine:
1) remove immediately adjacent identical guards
2) guard(a && b) -> guard(a); guard(b);
3) guard(!(a || b)) ->guard(!a) guard(!b);
Once those three are done, we could consider implementing a naive form of guard
widening as an extension of (1) above.</pre>
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