[Webkit-unassigned] [Bug 249217] Optimize StringImpl::lower() for 8-bit strings

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249217

--- Comment #2 from Darin Adler <darin at apple.com> ---
This microbenchmark being 3-4x faster in Chromium is an excellent opportunity for optimization.

The StringImpl::lower part is a very small part of this (was 12% at the time they did it) but could still be a worthwhile thing to tighten up. Not sure we would want *exactly* what they did in Chromium since the most important case to optimize is probably no uppercase letters at all followed by all ASCII.

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