ce7ec6ef0a
Improve the lowering of CheckedInt32Div and CheckedUint32Div for the case that the right hand side is a known (positive) power of two, as in that case it's sufficient to just check the relevant bits on the left hand side and then shift by the appropriate amount of bits. This is significantly faster than what TurboFan is able to generate from the general lowering, even with all the MachineOperatorReducer magic (it even shows as a steady ~1.5% overall improvement on the Kraken crypto ccm benchmark). Also turn the general CheckedInt32Div lowering into readable code again, and make sure that all the bailout cases are properly covered by mjsunit tests (i.e. the "division by zero" bailout was not covered properly). Bug: v8:8015 Change-Id: Ibfdd367a6ee5d70dcaa48801858042c5029b7004 Reviewed-on: https://chromium-review.googlesource.com/1236954 Reviewed-by: Sigurd Schneider <sigurds@chromium.org> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Cr-Commit-Position: refs/heads/master@{#56115} |
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benchmarks | ||
build_overrides | ||
custom_deps | ||
docs | ||
gni | ||
include | ||
infra | ||
samples | ||
src | ||
test | ||
testing | ||
third_party | ||
tools | ||
.clang-format | ||
.clang-tidy | ||
.editorconfig | ||
.git-blame-ignore-revs | ||
.gitattributes | ||
.gitignore | ||
.gn | ||
.vpython | ||
.ycm_extra_conf.py | ||
AUTHORS | ||
BUILD.gn | ||
ChangeLog | ||
CODE_OF_CONDUCT.md | ||
codereview.settings | ||
DEPS | ||
LICENSE | ||
LICENSE.fdlibm | ||
LICENSE.strongtalk | ||
LICENSE.v8 | ||
LICENSE.valgrind | ||
OWNERS | ||
PRESUBMIT.py | ||
README.md | ||
snapshot_toolchain.gni | ||
WATCHLISTS |
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://github.com/v8/v8/wiki
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 on the V8 wiki.