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Manos Koukoutos 70a452ffcc [wasm-gc] Optimize away nominal type upcasts 
We optimize away type upcasts for nominal types in WasmFullDecoder.
Upcasts trivially hold for nominal types, which is not the case for
structural types. Note that we already optimize away trivially-failing
checks (when types are unrelated) for both nominal and structural types.

Bug: v8:7748
Change-Id: I720c9803cb8b4071aa4bae112ce06d587b7a68fa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3306984
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78201}
2021-12-02 10:36:42 +00:00
.github [github] Close PRs created on the V8 GitHub mirror automatically 2021-01-12 08:39:59 +00:00
bazel [bazel] Upstream arm64 fix 2021-12-01 10:33:09 +00:00
build_overrides [build] Remove obsolete gn flag 2021-01-11 15:50:59 +00:00
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samples [api] V8::Initialize cleanup 2021-11-30 14:30:38 +00:00
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test [wasm-gc] Optimize away nominal type upcasts 2021-12-02 10:36:42 +00:00
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README.md

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.