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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - B3 should have a story for Ext/Trunc strength reduction"
href="https://bugs.webkit.org/show_bug.cgi?id=151464">151464</a>
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<th>Summary</th>
<td>B3 should have a story for Ext/Trunc strength reduction
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
</td>
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<th>Hardware</th>
<td>All
</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>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>JavaScriptCore
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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</tr>
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<th>Reporter</th>
<td>fpizlo@apple.com
</td>
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<p>
<div>
<pre>The LLVM shift operations require the shift amount to have the same type as the shift base. The B3 shift operations require the shift amount to be an Int32. DFG concurs with this. But the initial lowering will probably involve pretending the FTLOutput's shift operations still take an LLVM-style shift amount, and then on B3 they will emit a Trunc. That means that we'll want to be able to constant fold Trunc and be able to fold Trunc(ZExt).</pre>
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