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<body><span class="vcard"><a class="email" href="mailto:sbarati@apple.com" title="Saam Barati <sbarati@apple.com>"> <span class="fn">Saam Barati</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - DFG CSE should know how to decay a MultiGetByOffset"
href="https://bugs.webkit.org/show_bug.cgi?id=159859">bug 159859</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Assignee</td>
<td>webkit-unassigned@lists.webkit.org
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<td>sbarati@apple.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - DFG CSE should know how to decay a MultiGetByOffset"
href="https://bugs.webkit.org/show_bug.cgi?id=159859#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - DFG CSE should know how to decay a MultiGetByOffset"
href="https://bugs.webkit.org/show_bug.cgi?id=159859">bug 159859</a>
from <span class="vcard"><a class="email" href="mailto:sbarati@apple.com" title="Saam Barati <sbarati@apple.com>"> <span class="fn">Saam Barati</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=159859#c2">comment #2</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=159859#c1">comment #1</a>)
> > Is MultiGetByOffset not dominated by a StructureCheck the way GetByOffset is?
>
> It's not dominated by a CheckStructure. The MultiGetByOffset does its own
> structure check.
>
> We want one switch statement that both checks that we have the structure we
> want and loads the value. CheckStructure with multiple structures in its
> set will be a switch and MultiGetByOffset is always a switch (unless we
> failed to strength-reduce a one-case MultiGetByOffset), so that would be two
> switches. That's not cool, because we can't guarantee that B3 will
> jump-thread or tail-dup two switches in a row. So, MultiGetByOffset is its
> own check.</span >
Gotcha. I'll work on fixing this.</pre>
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