Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 49aa1f677db48f71900699b62cb7839f8852e559
https://github.com/WebKit/WebKit/commit/49aa1f677db48f71900699b62cb7839f8852e559
Author: Yusuke Suzuki <[email protected]>
Date: 2023-10-06 (Fri, 06 Oct 2023)
Changed paths:
M Source/JavaScriptCore/jit/JIT.cpp
M Source/JavaScriptCore/jit/JIT.h
M Source/JavaScriptCore/jit/JITOpcodes.cpp
M Source/JavaScriptCore/llint/LowLevelInterpreter.asm
M Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
M Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
Log Message:
-----------
[JSC] Do inlining a bit of op_typeof_is_function
https://bugs.webkit.org/show_bug.cgi?id=262771
rdar://116567151
Reviewed by Keith Miller.
It is surprisingly common doing `typeof xxx === "function"` since it is a way
to perform feature detection.
If the function does not exist, xxx is undefined etc. And we see this pattern
very frequently.
This patch adds fast path for non object cases of the above typeof in LLInt and
Baseline JIT.
DFG and FTL already handle this well.
* Source/JavaScriptCore/jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
(JSC::JIT::privateCompileSlowCases):
* Source/JavaScriptCore/jit/JIT.h:
* Source/JavaScriptCore/jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_typeof_is_function):
* Source/JavaScriptCore/llint/LowLevelInterpreter.asm:
* Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm:
* Source/JavaScriptCore/llint/LowLevelInterpreter64.asm:
Canonical link: https://commits.webkit.org/268991@main
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