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Clemens Backes a06b4603e1 [wasm] Speed up ValueType::element_size_bytes 
It turns out that Liftoff often needs to know the size of a value in
bytes. Currently we are loading the size_log_2 from an array and then
performing a shift by that amount. We can slightly speed this up by just
loading the correct value directly.

Drive-by: Use {int8_t} for the internal array, since all values will
easily fit in that range.

R=thibaudm@chromium.org

Bug: v8:10576
Change-Id: I1b832ba404ff9913e2272d332f312b371b6ce3d4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2267302
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68557}
2020-06-26 12:00:44 +00:00
build_overrides tracing: Enable using Perfetto client library from Chromium 2020-05-11 11:17:57 +00:00
custom_deps Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
docs Add OWNERS for docs/ 2019-05-15 12:06:15 +00:00
gni Integrate fuzzilli into v8 2020-06-03 09:53:24 +00:00
include [d8] Changes needed for testing Atomics.waitasync 2020-06-25 14:13:06 +00:00
infra Remove unmaintained trybots 2020-06-24 12:49:32 +00:00
samples cppgc: Introduce AllocationHandle 2020-06-10 23:11:20 +00:00
src [wasm] Speed up ValueType::element_size_bytes 2020-06-26 12:00:44 +00:00
test [wasm-simd][arm] Prototype f64x2.ceil 2020-06-25 18:38:31 +00:00
testing Roll v8/third_party/googletest/src/ 10b1902d8..e3f0319d8 (43 commits) 2020-04-15 07:23:10 +00:00
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tools [test] Work around Android linker warning in test output 2020-06-26 11:52:12 +00:00
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.ycm_extra_conf.py Fix ycm config for headers without source 2019-12-09 11:59:21 +00:00
AUTHORS [tools] Map search bar feature added, map id changed from int to string 2020-06-18 11:09:21 +00:00
BUILD.gn Updated BUILD.gn to link fuzzilli 2020-06-25 08:46:32 +00:00
CODE_OF_CONDUCT.md Explicitly state that the Chromium Code of Conduct also applies to V8 2016-03-02 09:51:24 +00:00
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COMMON_OWNERS [owners] Add thibaudm and ecmziegler to COMMON_OWNERS 2020-05-20 18:41:54 +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.