Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b2bcb5ab9983735af83731aa5eb5fd8ada3f8f87
https://github.com/WebKit/WebKit/commit/b2bcb5ab9983735af83731aa5eb5fd8ada3f8f87
Author: Chris Dumez <[email protected]>
Date: 2026-04-09 (Thu, 09 Apr 2026)
Changed paths:
M Source/WebCore/dom/make_names.pl
Log Message:
-----------
Collapse single-case switch chains into prefix comparisons in generated
NodeName.cpp
https://bugs.webkit.org/show_bug.cgi?id=311785
Reviewed by Darin Adler.
When multiple names share a long common prefix (e.g. vert-origin-x /
vert-origin-y),
the generator was emitting one nested switch per shared character — up to 12
levels
deep — instead of a single compareCharacters() or WTF::equal() call for the
shared
prefix. Detect common prefixes and emit a single comparison before recursing.
This did not show as an obvious progression on Speedometer (very close to noise
level) but it is theoretically more efficient and results in simpler / more
concise
code so I think we should do it.
* Source/WebCore/dom/make_names.pl:
(computeCommonPrefixLength):
(printPrefixCheck):
(generateFindNameForLength):
(generateFindBody):
Canonical link: https://commits.webkit.org/310842@main
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