Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b6d94e4de12fab00aa972f7ad5c6358995ea558c
https://github.com/WebKit/WebKit/commit/b6d94e4de12fab00aa972f7ad5c6358995ea558c
Author: Yusuke Suzuki <[email protected]>
Date: 2026-03-09 (Mon, 09 Mar 2026)
Changed paths:
M Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp
M Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp
M Source/JavaScriptCore/interpreter/Interpreter.cpp
M Source/JavaScriptCore/runtime/JSMicrotask.cpp
M Source/JavaScriptCore/runtime/JSPromise.cpp
M Source/JavaScriptCore/runtime/JSPromise.h
Log Message:
-----------
[JSC] Micro-optimize triggerPromiseReactions
https://bugs.webkit.org/show_bug.cgi?id=309490
rdar://172069345
Reviewed by Yijia Huang.
1. We store JSEmpty to JSPromise reactionsOrResult field instead, which
makes checking empty super fast.
2. triggerPromiseReactions should have a fast path for one reaction case
as it is very common.
* Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp:
* Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileCreatePromise):
* Source/JavaScriptCore/interpreter/Interpreter.cpp:
(JSC::Interpreter::getAsyncStackTrace):
* Source/JavaScriptCore/runtime/JSMicrotask.cpp:
(JSC::runInternalMicrotask):
* Source/JavaScriptCore/runtime/JSPromise.cpp:
(JSC::JSPromise::performPromiseThen):
(JSC::JSPromise::performPromiseThenWithInternalMicrotask):
(JSC::JSPromise::rejectPromise):
(JSC::JSPromise::fulfillPromise):
(JSC::JSPromise::triggerPromiseReactions):
* Source/JavaScriptCore/runtime/JSPromise.h:
(JSC::JSPromise::initialValues):
Canonical link: https://commits.webkit.org/308926@main
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