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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - DFG string concatenation shouldn't be playing fast and loose with effects and OSR exit"
href="https://bugs.webkit.org/show_bug.cgi?id=148338">148338</a>
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<th>Summary</th>
<td>DFG string concatenation shouldn't be playing fast and loose with effects and OSR exit
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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>Other
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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
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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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<pre>DFG string concatenation appears to have various different ways of creating an OSR exit right after a side effect. We should change this code so that it is only speculative when it isn't effectful. It also happens to be the case that if string concat needs to be effectful, then it will already be sufficiently slow that making it speculative won't help anyone. So, this kind of clean-up is likely to not affect performance; it'll just make the compiler easier to hack on.</pre>
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