RESOLVED FIXED292696
[Yarr] Improve efficiency of non-BMP character classes with a fixed size greater than 1 
https://bugs.webkit.org/show_bug.cgi?id=292696
Summary [Yarr] Improve efficiency of non-BMP character classes with a fixed size grea...
Michael Saboff
Reported 2025-05-07 17:35:02 PDT
When reading surrogate pairs, we have an optimization to advance 2 UTF-16 characters when the first code point we read is a non-BMP code point. That optimization involves checking the first code point loaded in the top level disjunction. That optimization uses a small set of instructions to check if we read the first code point and its size. For a character class consisting of only non-BMP characters, we don't need to perform the 'is this the first code point read and what its size" check when reading code points after the first code point.
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Radar WebKit Bug Importer
Comment 1 2025-05-07 17:35:53 PDT
<rdar://problem/150893671>
Michael Saboff
Comment 2 2025-05-07 18:04:47 PDT
Pull request: https://github.com/apple/WebKit/pull/3066
Michael Saboff
Comment 3 2025-05-12 11:14:39 PDT
Pull request: https://github.com/WebKit/WebKit/pull/45260
EWS
Comment 4 2025-05-13 09:39:38 PDT
Committed 294852@main (608810ff3697): <https://commits.webkit.org/294852@main> Reviewed commits have been landed. Closing PR #45260 and removing active labels.
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