Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 41ee8b26825110c19e6aab1580e2d8ad89a2abb8
https://github.com/WebKit/WebKit/commit/41ee8b26825110c19e6aab1580e2d8ad89a2abb8
Author: Sergey Rubanov <[email protected]>
Date: 2026-07-20 (Mon, 20 Jul 2026)
Changed paths:
M Source/JavaScriptCore/b3/B3LowerToAir.cpp
M Source/JavaScriptCore/b3/testb3.h
M Source/JavaScriptCore/b3/testb3_2.cpp
M Source/JavaScriptCore/b3/testb3_3.cpp
Log Message:
-----------
[JSC] Match non-canonical SBFX form in B3LowerToAir
https://bugs.webkit.org/show_bug.cgi?id=271412
Reviewed by Yijia Huang.
B3LowerToAir already selected sbfx for SShr(Shl((Z|S)Shr(src, lsb), amount),
amount).
Also match SShr(Shl(src, leftAmt), rightAmt) with rightAmt > leftAmt so that
form
selects sbfx without expanding IR in ReduceStrength on every target.
* Source/JavaScriptCore/b3/B3LowerToAir.cpp:
(JSC::B3::LowerToAir::lower):
* Source/JavaScriptCore/b3/testb3.h:
* Source/JavaScriptCore/b3/testb3_2.cpp:
* Source/JavaScriptCore/b3/testb3_3.cpp:
(testExtractSignedBitfieldNonCanonical32):
(testExtractSignedBitfieldNonCanonical64):
Canonical link: https://commits.webkit.org/317564@main
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