Bug 304792

Summary:	Optimize StringImpl::create8BitIfPossible()
Product:	WebKit	Reporter:	Chris Dumez <cdumez>
Component:	Web Template Framework	Assignee:	Chris Dumez <cdumez>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Chris Dumez

Reported 2025-12-30 17:44:19 PST

Optimize StringImpl::create8BitIfPossible(). Avoid allocating new string unnecessarily in the "slow" path. Rely on highly optimized `copyElements()` to copy characters in the fast path. This results in a 0.42-0.44% speedometer on Mac with 98% confidence.

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Chris Dumez

Comment 1 2025-12-30 17:46:30 PST

Pull request: https://github.com/WebKit/WebKit/pull/55953

Radar WebKit Bug Importer

Comment 2 2026-01-06 17:45:11 PST

<rdar://problem/167662275>

EWS

Comment 3 2026-01-08 00:32:34 PST

Committed 305259@main (56dcc0037aa2): <https://commits.webkit.org/305259@main> Reviewed commits have been landed. Closing PR #55953 and removing active labels.

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