Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 22e1f2da1cbad1f2ae39bcff2d62e9ab7e7fb3e5
https://github.com/WebKit/WebKit/commit/22e1f2da1cbad1f2ae39bcff2d62e9ab7e7fb3e5
Author: Yusuke Suzuki <[email protected]>
Date: 2026-03-30 (Mon, 30 Mar 2026)
Changed paths:
M Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp
M Source/JavaScriptCore/jit/AssemblyHelpers.cpp
M Source/JavaScriptCore/jit/AssemblyHelpers.h
Log Message:
-----------
[JSC] Micro-optimize AssemblyHelpers asm code for ARM64
https://bugs.webkit.org/show_bug.cgi?id=311012
rdar://173620352
Reviewed by Keith Miller.
Let's use fused ARM64 instructions (shift and xor) to reduce instructions.
Also using branchTest64 for Int52 check which offers better instructions
for ARM64.
* Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
* Source/JavaScriptCore/jit/AssemblyHelpers.cpp:
(JSC::emitRandomThunkImpl):
(JSC::AssemblyHelpers::wangsInt64Hash):
* Source/JavaScriptCore/jit/AssemblyHelpers.h:
(JSC::AssemblyHelpers::isStrictInt52):
(JSC::AssemblyHelpers::isNotStrictInt52):
Canonical link: https://commits.webkit.org/310256@main
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