c07d8535f8
This patch doubles the performance of iterating over a stringview_wtf16. It does this by: - changing string.as_wtf16 to flatten any Cons strings; in TF this is represented by a new operator - introducing a Turbofan operator PrepareStringForGetCodeunit that inspects the given string's internal representation and retrieves the pointer to the actual characters - adapting the code emitted for `get_codeunit` to consume the output of this operator - improving WasmLoadElimination to deduplicate both new operators for peeled loops, so that as much work as possible only needs to be done once. This patch was authored about half-and-half by manoskouk@chromium.org and jkummerow@chromium.org. Bug: v8:12868 Change-Id: If9cf4c3ffeb5e1ca08b864cbc0bf868656ca2dec Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4198142 Commit-Queue: Jakob Kummerow <jkummerow@chromium.org> Reviewed-by: Tobias Tebbi <tebbi@chromium.org> Reviewed-by: Manos Koukoutos <manoskouk@chromium.org> Cr-Commit-Position: refs/heads/main@{#85628} |
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V8 JavaScript Engine
V8 is Google's open source JavaScript engine.
V8 implements ECMAScript as specified in ECMA-262.
V8 is written in C++ and is used in Google Chrome, the open source browser from Google.
V8 can run standalone, or can be embedded into any C++ application.
V8 Project page: https://v8.dev/docs
Getting the Code
Checkout depot tools, and run
fetch v8
This will checkout V8 into the directory v8 and fetch all of its dependencies.
To stay up to date, run
git pull origin
gclient sync
For fetching all branches, add the following into your remote
configuration in .git/config:
fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
fetch = +refs/tags/*:refs/tags/*
Contributing
Please follow the instructions mentioned at v8.dev/docs/contribute.