Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 8854738a99112e8e38814bce4f6726b24928e0fe
https://github.com/WebKit/WebKit/commit/8854738a99112e8e38814bce4f6726b24928e0fe
Author: Charlie Wolfe <[email protected]>
Date: 2026-09-08 (Tue, 08 Sep 2026)
Changed paths:
M Source/WebCore/platform/graphics/TextMeasurementCache.h
Log Message:
-----------
Hash and compare only the used characters of a TextMeasurementCache
SmallStringKey
https://bugs.webkit.org/show_bug.cgi?id=323724
rdar://186973909
Reviewed by Gerald Squelart.
SmallStringKey stores text inline in a zero-filled 64-entry char16_t array, and
hashed all 128 bytes
of it no matter how short the string was. The defaulted operator== also
compared the whole array on
every probe. Hash only the first length code units, and compare m_hashAndLength
first. It packs both
the hash and the length, so a mismatched bucket costs one word compare and only
a match compares
characters. The trailing bytes were always zero, so the same strings hash and
compare equal as
before.
* Source/WebCore/platform/graphics/TextMeasurementCache.h:
(WebCore::TextMeasurementCache::SmallStringKey::SmallStringKey):
(WebCore::TextMeasurementCache::SmallStringKey::operator==):
Canonical link: https://commits.webkit.org/320710@main
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