Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 3fbc2eefcf863f4c24d3ed9763e86c7e0f6543b2
https://github.com/WebKit/WebKit/commit/3fbc2eefcf863f4c24d3ed9763e86c7e0f6543b2
Author: Sosuke Suzuki <[email protected]>
Date: 2025-12-31 (Wed, 31 Dec 2025)
Changed paths:
M Source/WTF/wtf/CMakeLists.txt
M Source/WTF/wtf/text/StringImpl.cpp
Log Message:
-----------
[WTF] Optimize `String::fromUTF8` using simdutf
https://bugs.webkit.org/show_bug.cgi?id=304800
Reviewed by Yusuke Suzuki.
This patch changes to optimize `String::fromUTF8` using simdutf.
Here are the benchmark results measured on my local machine (M4 MAX MBP).
ASCII is neutral, and the others large data show significant improvement:
16 chars:
original this patch speedup
ASCII only : 1375.0 MB/s 1410.7 MB/s 1.03x
Japanese : 1028.9 MB/s 1210.0 MB/s 1.18x
Mixed : 861.2 MB/s 936.5 MB/s 1.09x
Emoji : 857.4 MB/s 988.8 MB/s 1.15x
32 chars:
original this patch speedup
ASCII only : 2434.5 MB/s 2538.4 MB/s 1.04x
Japanese : 1040.8 MB/s 2188.0 MB/s 2.10x
Mixed : 723.2 MB/s 1635.7 MB/s 2.26x
Emoji : 1007.1 MB/s 1539.4 MB/s 1.53x
64 chars:
original this patch speedup
ASCII only : 4874.6 MB/s 5203.6 MB/s 1.07x
Japanese : 1071.9 MB/s 2914.0 MB/s 2.72x
Mixed : 827.9 MB/s 2082.4 MB/s 2.52x
Emoji : 1222.0 MB/s 2118.1 MB/s 1.73x
128 chars:
original this patch speedup
ASCII only : 7691.5 MB/s 7701.6 MB/s 1.00x
Japanese : 1120.6 MB/s 4147.8 MB/s 3.70x
Mixed : 988.1 MB/s 2936.0 MB/s 2.97x
Emoji : 1283.0 MB/s 2727.3 MB/s 2.13x
256 chars:
original this patch speedup
ASCII only : 10547.6 MB/s 10894.6 MB/s 1.03x
Japanese : 1461.3 MB/s 4491.9 MB/s 3.07x
Mixed : 1142.8 MB/s 2978.2 MB/s 2.61x
Emoji : 1365.1 MB/s 3316.0 MB/s 2.43x
1K chars:
original this patch speedup
ASCII only : 15578.1 MB/s 15431.4 MB/s 0.99x
Japanese : 1049.6 MB/s 4686.6 MB/s 4.47x
Mixed : 627.7 MB/s 2986.9 MB/s 4.76x
Emoji : 830.1 MB/s 3094.2 MB/s 3.73x
4K chars:
original this patch speedup
ASCII only : 17720.4 MB/s 17419.0 MB/s 0.98x
Japanese : 1049.6 MB/s 4895.0 MB/s 4.66x
Mixed : 659.9 MB/s 3487.1 MB/s 5.28x
Emoji : 941.8 MB/s 2764.5 MB/s 2.94x
10K chars:
original this patch speedup
ASCII only : 18314.3 MB/s 19397.0 MB/s 1.06x
Japanese : 620.2 MB/s 4925.0 MB/s 7.94x
Mixed : 400.4 MB/s 3524.1 MB/s 8.80x
Emoji : 684.5 MB/s 3058.3 MB/s 4.47x
100K chars:
original this patch speedup
ASCII only : 14003.4 MB/s 22619.4 MB/s 1.62x
Japanese : 830.0 MB/s 4994.0 MB/s 6.02x
Mixed : 717.9 MB/s 3012.6 MB/s 4.20x
Emoji : 936.2 MB/s 3357.0 MB/s 3.59x
Test: Tools/TestWebKitAPI/Tests/WTF/UTF8Conversion.cpp
* Source/WTF/wtf/CMakeLists.txt:
* Source/WTF/wtf/text/StringImpl.cpp:
(WTF::StringImpl::create):
Canonical link: https://commits.webkit.org/305014@main
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