Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 6bca30fcc772588914e2db2da8f26c69f1c7eecd
https://github.com/WebKit/WebKit/commit/6bca30fcc772588914e2db2da8f26c69f1c7eecd
Author: David Degazio <[email protected]>
Date: 2024-07-31 (Wed, 31 Jul 2024)
Changed paths:
M Source/JavaScriptCore/b3/B3Value.h
M Source/JavaScriptCore/b3/B3ValueInlines.h
Log Message:
-----------
[JSC] B3 Values shouldn't recompute their adjacency list offset when children
are accessed
https://bugs.webkit.org/show_bug.cgi?id=277381
rdar://132848864
Reviewed by Yusuke Suzuki.
Avoids calling adjacencyListOffset() every time we need to access the adjacency
list
of a B3::Value. Currently, because we don't have the information about what
derived
class we are, this function means we switch on the B3::Value's opcode every
time we
access any child of a Value. With this patch, we instead compute this offset
once on
node construction, and cache it as a 16-bit integer field on the base Value, in
what
was previously two bytes of unused padding.
* Source/JavaScriptCore/b3/B3Value.h:
* Source/JavaScriptCore/b3/B3ValueInlines.h:
(JSC::B3::Value::computeAdjacencyListOffset const):
(JSC::B3::Value::adjacencyListOffset const): Deleted.
Canonical link: https://commits.webkit.org/281663@main
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