Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 2ec81a993d3545b50fad8cca19ea0cb5d021df18
https://github.com/WebKit/WebKit/commit/2ec81a993d3545b50fad8cca19ea0cb5d021df18
Author: Sosuke Suzuki <[email protected]>
Date: 2026-04-13 (Mon, 13 Apr 2026)
Changed paths:
A JSTests/microbenchmarks/json-stringify-int32-array.js
M Source/JavaScriptCore/runtime/JSONObject.cpp
Log Message:
-----------
[JSC] Add Int32 array fast path to `FastStringifier` for `JSON.stringify`
https://bugs.webkit.org/show_bug.cgi?id=311911
Reviewed by Yusuke Suzuki.
For Int32-shaped arrays, FastStringifier currently calls canGetIndexQuickly +
getIndexQuickly per element (each switching on indexingType()) and then
re-enters the recursive append(JSValue) type-dispatch chain.
Add a NEVER_INLINE appendInt32Array() that walks the contiguousInt32 butterfly
directly and emits each element via std::to_chars. The Int32 emission body is
factored into ALWAYS_INLINE appendInt32() shared with the existing isInt32()
case.
Before Patched
json-stringify-int32-array 61.2083+-0.5523 ^
19.8872+-0.1330 ^ definitely 3.0778x faster
json-stringify-empty-array 20.7855+-0.5127
20.7303+-0.1234
vanilla-todomvc-json-stringify 48.5458+-0.4959 ^
47.1891+-0.4344 ^ definitely 1.0288x faster
<geometric> 48.9427+-0.2815 ^
40.2815+-0.1213 ^ definitely 1.2150x faster
Test: JSTests/microbenchmarks/json-stringify-int32-array.js
* JSTests/microbenchmarks/json-stringify-int32-array.js: Added.
* Source/JavaScriptCore/runtime/JSONObject.cpp:
(JSC::bufferMode>::appendInt32):
(JSC::bufferMode>::append):
(JSC::bufferMode>::appendInt32Array):
Canonical link: https://commits.webkit.org/311051@main
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