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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [guards] Jump threading of guards"
href="https://llvm.org/bugs/show_bug.cgi?id=31522">31522</a>
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<th>Summary</th>
<td>[guards] Jump threading of guards
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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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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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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</tr>
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>JumpThreading should handle guards when the guard can be reorder to the
beginning of the block and the guard condition is known to be true along some
inbound paths.
if (a != null) {
a->f = 5;
}
guard (a != null);
==>
if (a != null) {
a->f = 5;
} else {
guard (a != null);
}
Note that we only need to handle the relatively simple cases. The idea is to
allow better canonicalization before lowering, not to duplicate the entirety of
our optimizations over branches on guards.</pre>
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