Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b6c35f4cd18125c7d3acb54ace62b9d74a67a45c
https://github.com/WebKit/WebKit/commit/b6c35f4cd18125c7d3acb54ace62b9d74a67a45c
Author: David Degazio <d_dega...@apple.com>
Date: 2025-02-27 (Thu, 27 Feb 2025)
Changed paths:
M Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
Log Message:
-----------
[JSC] Still optimize String.at, .charAt, .charCodeAt, and .codePointAt in DFG
when called with no arguments
https://bugs.webkit.org/show_bug.cgi?id=288657
rdar://145696925
Reviewed by Yijia Huang.
Parses calls to String.at, .charAt, .charCodeAt, and .codePointAt with no
arguments
(not including this) into their respective intrinsics but with a constant zero
index,
since coercing an undefined argument into an integer as is done in these
intrinsics
always returns zero. Previously, we wouldn't optimize such calls, potentially
limiting
DFG/FTL performance on this weird but apparently not too uncommon pattern.
* Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::handleIntrinsicCall):
Canonical link: https://commits.webkit.org/291263@main
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