RESOLVED FIXED305297
Avoid calling collectMatchingRulesForList() when rules is null or empty 
https://bugs.webkit.org/show_bug.cgi?id=305297
Summary Avoid calling collectMatchingRulesForList() when rules is null or empty
Chris Dumez
Reported 2026-01-11 15:01:09 PST
Avoid calling collectMatchingRulesForList() when rules is null or empty. This is done by making collectMatchingRulesForList() inline and having to the checks before calling a non-inline collectMatchingRulesForListSlow() function. This allows us to avoid calling collectMatchingRulesForListSlow() over 60% of the time on Speedometer 3 and results in a 0.20-0.26% progression overall.
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Add attachment proposed patch, testcase, etc.
Chris Dumez
Comment 1 2026-01-11 15:02:25 PST
Pull request: https://github.com/WebKit/WebKit/pull/56426
EWS
Comment 2 2026-01-11 16:33:40 PST
Committed 305434@main (e1396917113b): <https://commits.webkit.org/305434@main> Reviewed commits have been landed. Closing PR #56426 and removing active labels.
Radar WebKit Bug Importer
Comment 3 2026-01-11 16:34:13 PST
<rdar://problem/167954048>
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