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Clemens Backes 7f3574e01c [wasm] Improve LEB decoding slow-path
Returning a pair instead of writing to two output parameters avoids a
number of memory writes in the unrolled LEB-decoding slow path.
Instead of writing to the length and result pointer after each byte, we
now only write once at the very end.

This makes the LEB decoding slow-path ~30% faster locally (but we do not
spend much time in that function overall for most modules).

R=dlehmann@chromium.org

Bug: v8:13565, v8:13673
Change-Id: I02baeb0eb4620c46ba0babbc32bb6ac087887d34
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4200633
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Daniel Lehmann <dlehmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#85546}
2023-01-30 14:36:37 +00:00
.github
bazel [turbofan] Add the v8_enable_turbofan build option 2023-01-11 10:57:54 +00:00
build_overrides
custom_deps
docs
gni [gn] Provide explicit name in component builds 2023-01-26 12:05:07 +00:00
include cppgc: Introduce subtle::UncompressedMember 2023-01-26 23:51:28 +00:00
infra Configure PGO builders 2023-01-27 13:54:32 +00:00
samples [sandbox] Initialize sandbox during V8::Initialize 2022-07-15 09:29:32 +00:00
src [wasm] Improve LEB decoding slow-path 2023-01-30 14:36:37 +00:00
test [fastcall] Fixed missing representation in GetProjectionType 2023-01-30 14:14:23 +00:00
testing [test] Migrate cctest/test-api-accessors.cc to unittests/ 2022-05-17 08:27:55 +00:00
third_party [reland] adds the ability for v8 to use sin/cos from libm 2022-12-02 21:59:04 +00:00
tools Configure PGO builders 2023-01-27 13:54:32 +00:00
.bazelrc
.clang-format
.clang-tidy
.editorconfig
.flake8
.git-blame-ignore-revs [git blame] Add a few old refactors to .git-blame-ignore-revs 2023-01-04 15:43:38 +00:00
.gitattributes
.gitignore Adds sin/cos from glibc 2022-11-30 09:20:05 +00:00
.gn [fuchsia] Add API target level default value 2022-08-29 14:46:45 +00:00
.mailmap Add .mailmap entries for jgruber 2022-08-04 08:53:02 +00:00
.style.yapf [tools] Add basic pointer compression to grokdump 2022-02-04 14:35:26 +00:00
.vpython3 Reland "[resultdb] Add ResultDB indicator" 2022-10-14 11:05:59 +00:00
.ycm_extra_conf.py [ycm] Fix YouCompleteMe config 2022-11-02 15:59:48 +00:00
AUTHORS Revert "[turbofan] Optimize access to the length property of functions" 2023-01-23 08:58:42 +00:00
BUILD.bazel [bazel] Force code-generator to use Python3 2023-01-26 15:24:06 +00:00
BUILD.gn [turboshaft] Build skeleton for EffectControlLinearizer port 2023-01-26 12:37:28 +00:00
CODE_OF_CONDUCT.md
codereview.settings
COMMON_OWNERS [owners] Add mliedtke to COMMON_OWNERS 2022-09-16 14:12:27 +00:00
DEPS Update V8 DEPS (trusted) 2023-01-30 03:49:56 +00:00
DIR_METADATA
ENG_REVIEW_OWNERS Add mlippautz@ to ENG_REVIEW_OWNERS. 2022-10-06 18:48:33 +00:00
INFRA_OWNERS [infra] Add alexschulze@ as infra owner 2022-07-18 09:08:54 +00:00
INTL_OWNERS
LICENSE [mips32] Delete mips32 from v8 2022-09-13 07:54:54 +00:00
LICENSE.fdlibm
LICENSE.strongtalk
LICENSE.v8
LOONG_OWNERS
MIPS_OWNERS
OWNERS Make .ycm_extra_conf owned by COMMON_OWNERS 2022-11-07 09:51:53 +00:00
PPC_OWNERS PPC/S390: cleanup owner files 2023-01-23 17:07:21 +00:00
PRESUBMIT.py [presubmit] Handle Windows path for header guard check 2022-12-13 17:30:02 +00:00
README.md
RISCV_OWNERS
S390_OWNERS PPC/S390: cleanup owner files 2023-01-23 17:07:21 +00:00
WATCHLISTS Add a WATCHLIST entry for trap-handler 2023-01-18 09:00:37 +00:00
WORKSPACE [bazel] Remove zlib dependency 2022-08-17 15:30:25 +00:00

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.