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Junliang Yan 3d60549e73 PPC/s390: [turbofan] Add support for huge DataViews. 
Port 15c31fe461

Original Commit Message:

    This introduces Word64 support for the CheckBounds operator, which now
    lowers to either CheckedUint32Bounds or CheckedUint64Bounds after the
    representation selection. The right hand side of CheckBounds can now
    be any positive safe integer on 64-bit architectures, whereas it remains
    Unsigned31 for 32-bit architectures. We only use the extended Word64
    support when the right hand side is outside the Unsigned31 range, so
    for everything except DataViews this means that the performance should
    remain the same. The typing rule for the CheckBounds operator was
    updated to reflect this new behavior.

    The CheckBounds with a right hand side outside the Unsigned31 range will
    pass a new Signed64 feedback kind, which is handled with newly introduced
    CheckedFloat64ToInt64 and CheckedTaggedToInt64 operators in representation
    selection.

    The JSCallReducer lowering for DataView getType()/setType() methods was
    updated to not smi-check the [[ByteLength]] and [[ByteOffset]] anymore,
    but instead just use the raw uintptr_t values and operate on any value
    (for 64-bit architectures these fields can hold any positive safe
    integer, for 32-bit architectures it's limited to Unsigned31 range as
    before). This means that V8 can now handle huge DataViews fully, without
    falling off a performance cliff.

    This refactoring even gave us some performance improvements, on a simple
    micro-benchmark just exercising different DataView accesses we go from

      testDataViewGetUint8: 796 ms.
      testDataViewGetUint16: 997 ms.
      testDataViewGetInt32: 994 ms.
      testDataViewGetFloat64: 997 ms.

    to

      testDataViewGetUint8: 895 ms.
      testDataViewGetUint16: 889 ms.
      testDataViewGetInt32: 888 ms.
      testDataViewGetFloat64: 890 ms.

    meaning we lost around 10% on the single byte case, but gained 10% across
    the board for all the other element sizes.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ia86089ca9ccc75405aa13600b031c72bac0279dd
Reviewed-on: https://chromium-review.googlesource.com/c/1305035
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#57152}
2018-10-30 23:45:13 +00:00
benchmarks Reland: [builtins] Implement Array.prototype.slice in Torque 2018-10-19 21:27:19 +00:00
build_overrides [ndk] Change android ndk root for v8 2018-01-11 08:10:33 +00:00
custom_deps [build] Add common directory for custom deps 2018-06-08 19:23:02 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [build] disable asan on Windows for Torque 2018-10-10 11:47:40 +00:00
include [api] Fix AdjustAmountOfExternalAllocatedMemory memory reducer 2018-10-30 20:51:37 +00:00
infra [test] Bump shards on slow bot 2018-10-30 11:11:27 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src PPC/s390: [turbofan] Add support for huge DataViews. 2018-10-30 23:45:13 +00:00
test Roll Test262 2018-10-30 23:42:52 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [torque] Implement transient types and checking 2018-10-29 07:48:20 +00:00
tools inspector: move injected script source to native 2018-10-30 21:30:55 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.clang-tidy [tool] Remove unfixed clang-tidy warnings to ease use. 2018-10-26 07:40:32 +00:00
.editorconfig Add .editorconfig 2017-07-28 13:39:24 +00:00
.git-blame-ignore-revs [build] Add DEPS formatting to hyper-blame 2017-10-09 14:08:45 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore Ignore .torquelint-cache 2018-10-24 10:24:11 +00:00
.gn [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +00:00
.vpython [tools] Correctly identify and report test crashes and infra failures 2018-10-30 15:05:40 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS [typedarray] Use fast path for Float32Array.from(float_64_array) and similar 2018-10-26 09:47:46 +00:00
BUILD.gn inspector: move injected script source to native 2018-10-30 21:30:55 +00:00
ChangeLog [tools] Merge ChangeLog from latest release 2017-12-19 12:30:56 +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 Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
DEPS Roll Test262 2018-10-30 23:42:52 +00:00
LICENSE Add antlr4 runtime library to support Torque 2018-04-10 10:01:01 +00:00
LICENSE.fdlibm Add LICENSE.fdlibm for all the fdlibm imported sources. 2016-06-09 07:17:03 +00:00
LICENSE.strongtalk Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.v8 Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.valgrind Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
OWNERS Reduce wasm OWNERS to current team members 2018-10-15 14:47:49 +00:00
PRESUBMIT.py [tools] Correctly identify and report test crashes and infra failures 2018-10-30 15:05:40 +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 Reland "Add Windows ARM64 ABI support to V8" 2018-10-24 19:46:36 +00:00
WATCHLISTS Add myself to the watch list. 2018-10-22 16:20:40 +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.