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jarin 85fde59d53 [turbofan] Introduce CheckUnless. 
Similarly to CheckIf, CheckUnless is a deoptimization without a specific
frame state. A frame state is assigned during effect-control linearization
(and CheckUnless is turned into DeoptimizeUnless).

At the moment, the new operator is only used at one place in native context
specialization, but we should use it everywhere. The advantage of
CHeckUnless is that it avoids non-truncating uses of values by frame
states. This particular change is aimed at Octane's crypto, where this
enables to turn one NumberMultiply into Int32Mul, and thus improve
the score by more than 10% (it also needs minus zero truncation and
typing to be improved, but those CLs are already in flight).

BUG=v8:4470
R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2080113002
Cr-Commit-Position: refs/heads/master@{#37085}
2016-06-20 03:48:18 +00:00
benchmarks Revert "Refactoring: Make gtest testsuite the default." 2014-09-02 09:17:26 +00:00
build_overrides [gn] Fix another ia32/x86 typo. 2016-06-17 07:44:41 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni Update GN build to use v8_target_cpu instead of v8_target_arch. 2016-06-17 07:07:30 +00:00
gypfiles [build] Use icu data file by default 2016-06-09 13:24:58 +00:00
include Introduce EmbedderHeapTracer::EnterFinalPause() 2016-06-17 10:25:47 +00:00
infra [mb] Remove redundant flags 2016-06-17 12:29:55 +00:00
samples [icu] Support loading data file from default location 2016-06-08 12:11:34 +00:00
src [turbofan] Introduce CheckUnless. 2016-06-20 03:48:18 +00:00
test [builtins] Introduce proper Float64Cos and Float64Sin. 2016-06-17 15:24:15 +00:00
testing Converted V8 CQ config to proto-format 2015-05-28 15:02:53 +00:00
third_party/binutils [gn] Move build to gypfiles 2016-04-29 10:11:11 +00:00
tools [tools] make ic-explorer deal with empty map records from --trace-ic 2016-06-16 07:08:19 +00:00
.clang-format [formatting] Remove the formatting requirement for 2 empty lines between declarations. 2016-01-25 09:50:17 +00:00
.gitignore [mb] Add mb config 2016-06-09 09:12:54 +00:00
.gn [gn] Port exec_script whitelist from chromium/src/build 2016-06-07 07:49:12 +00:00
.ycm_extra_conf.py Use C++11 / gnu++11, not 0x 2016-03-22 15:24:43 +00:00
AUTHORS Parser: Report use counts once per feature 2016-06-14 21:41:31 +00:00
BUILD.gn [wasm] Split off debug info from wasm object 2016-06-17 08:35:14 +00:00
ChangeLog [Release] Update ChangeLog file 2016-02-17 21:29:09 +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
codereview.settings Use v8-reviews@ for review mail, so v8-dev@ is free for dev discussions 2015-09-09 08:14:11 +00:00
DEPS Update V8 DEPS. 2016-06-20 03:25:22 +00:00
LICENSE Updates to the license information of third party components. 2015-06-16 12:37:50 +00:00
LICENSE.fdlibm Add LICENSE.fdlibm for all the fdlibm imported sources. 2016-06-09 07:17:03 +00:00
LICENSE.strongtalk
LICENSE.v8
LICENSE.valgrind
Makefile PPC/s390: [build] fix target_arch for ppc/s390 native builds 2016-06-17 13:57:09 +00:00
Makefile.android [build] Fix d8-for-Android builds 2016-05-20 12:10:45 +00:00
Makefile.nacl [gn] Move build to gypfiles 2016-04-29 10:11:11 +00:00
OWNERS [owners] adding more toplevel owners (but mainly me) 2016-03-16 15:54:42 +00:00
PRESUBMIT.py Remove LOG line checking from presubmit 2016-05-10 17:21:56 +00:00
README.md [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
snapshot_toolchain.gni Try to reland v8_snapshot GN build changes, take #3 2016-05-20 07:00:09 +00:00
WATCHLISTS [GN] Watchlist upadate to track gyp changes. 2016-05-17 08:14:26 +00:00

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://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.