Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b6dc732b40aaa92fb82d874683456e8d2e508d8f
https://github.com/WebKit/WebKit/commit/b6dc732b40aaa92fb82d874683456e8d2e508d8f
Author: Yusuke Suzuki <[email protected]>
Date: 2024-07-21 (Sun, 21 Jul 2024)
Changed paths:
M Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
Log Message:
-----------
[JSC] Emit more efficient bytecodes for some patterns in the wild
https://bugs.webkit.org/show_bug.cgi?id=276858
rdar://132180708
Reviewed by Yijia Huang.
Through careful review of Angular generated code, we found several patterns.
This patch optimizes them.
1. When try-catch-finally is used, we were not using
emitNodeInIgnoreResultPosition. We should use that
so that we can potentially convert some of call bytecodes to
call_ignore_result.
2. !(function () { ... })() pattern is used well in the wild. This patch
attempts to remove `!` when we detect
that the resulted value is not used since ! is not user-observable.
* Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp:
(JSC::UnaryOpNode::emitBytecode):
(JSC::TryNode::emitBytecode):
Canonical link: https://commits.webkit.org/281177@main
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