Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: d1099dd4f9b4cc010961bfca56f2368923802bff
https://github.com/WebKit/WebKit/commit/d1099dd4f9b4cc010961bfca56f2368923802bff
Author: Sosuke Suzuki <sos...@bun.sh>
Date: 2025-09-01 (Mon, 01 Sep 2025)
Changed paths:
A JSTests/microbenchmarks/minified-typeof-not-undefined.js
A JSTests/stress/minified-typeof-not-undefined.js
M Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
M Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
Log Message:
-----------
[JSC] emit `op_not` and `op_typeof_is_undefined` for `typeof x<"u"`
https://bugs.webkit.org/show_bug.cgi?id=298167
Reviewed by Yusuke Suzuki.
This patch changes to apply the same optimization as
https://commits.webkit.org/299368@main
to `typeof x < "u"` as well.
TipOfTree Patched
minified-typeof-not-undefined 4.5425+-0.2007 ^ 1.9118+-0.0462
^ definitely 2.3760x faster
* JSTests/microbenchmarks/minified-typeof-not-undefined.js: Added.
(test):
* JSTests/stress/minified-typeof-not-undefined.js: Added.
(shouldBe):
(test):
(i.shouldBe.test):
* Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::tryEmitTypeofIsUndefinedForStringComparison):
(JSC::BytecodeGenerator::emitBinaryOp):
* Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h:
Canonical link: https://commits.webkit.org/299412@main
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