Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 6eff2e74e0486893a0f88f83b56a7246700538e6
https://github.com/WebKit/WebKit/commit/6eff2e74e0486893a0f88f83b56a7246700538e6
Author: Yusuke Suzuki <[email protected]>
Date: 2026-05-29 (Fri, 29 May 2026)
Changed paths:
A JSTests/stress/yarr-jit-shared-lead-prefilter.js
M Source/JavaScriptCore/yarr/YarrJIT.cpp
M Source/JavaScriptCore/yarr/YarrPattern.cpp
M Source/JavaScriptCore/yarr/YarrPattern.h
Log Message:
-----------
[YARR] Optimize character-classes / patterns with shared lead-surrogate
https://bugs.webkit.org/show_bug.cgi?id=315803
rdar://178192192
Reviewed by Sosuke Suzuki.
This patch optimizes the case where we have shared lead-surrogate.
Similar non-BMP Unicode characters is clustered into particular range,
thus it is possible that they are having the same lead-surrogate. This
patch leverages this characteristics to optimize things.
We add hasSharedLeadSurrogate which extracts a shared lead-surrogate
from non-BMP characters. And then using this for quick-check filtering
and character-class matching.
Test: JSTests/stress/yarr-jit-shared-lead-prefilter.js
* JSTests/stress/yarr-jit-shared-lead-prefilter.js: Added.
(shouldBe):
(shouldBeArray):
(execBoth):
(shouldBeArray.re.exec):
(throw.new.Error):
* Source/JavaScriptCore/yarr/YarrJIT.cpp:
* Source/JavaScriptCore/yarr/YarrPattern.cpp:
(JSC::Yarr::CharacterClass::hasSharedLeadSurrogate const):
* Source/JavaScriptCore/yarr/YarrPattern.h:
Canonical link: https://commits.webkit.org/314122@main
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