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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [JSC] op_in should have ArrayProfile"
href="https://bugs.webkit.org/show_bug.cgi?id=164581">164581</a>
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<th>Summary</th>
<td>[JSC] op_in should have ArrayProfile
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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
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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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>utatane.tea@gmail.com
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<p>
<div>
<pre>Much time is taken in Array.prototype.map in ES6SampleBench/Basic.
And sampling profiler tells us that op_in is one of the hottest bytecode.
We have a path optimizing `"string" in obj` case, but we always fall into the slow generic code for `index in array` case.
We should have array profile and handle op_in like GetByVal thing.</pre>
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