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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - MovHint should be a strong use"
href="https://bugs.webkit.org/show_bug.cgi?id=143734">143734</a>
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<th>Summary</th>
<td>MovHint should be a strong use
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>528+ (Nightly build)
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>fpizlo@apple.com
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<p>
<div>
<pre>Currently MovHint is a "weak" use in the sense that if nothing else uses a child of a MovHint then the MovHint turns into a ZombieHint. We should change this. Instead, MovHint should be a strong use. This will fix bugs where our other mechanisms of keeping things alive for OSR (i.e. Phantoms) aren't properly preserved.
This will reduce the amount of DCE we do. As part of this patch, we should mitigate the reduction in DCE by introducing a phase that removes MovHints if the value is dead in bytecode.</pre>
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