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Benedikt Meurer dfbb3db5ef [turbofan] Improve representation selection for Smi checking. 
Rename the high-level operators CheckTaggedSigned to CheckSmi and
CheckTaggedPointer to CheckHeapObject, to better match the naming
convention (i.e. ObjectIsSmi and CheckSmi, ObjectIsString and
CheckString, etc.).

For lowering CheckSmi, always report TaggedSigned representation
and let the RepresentationChanger come up with a reasonable conversion
from whatever input representation to TaggedSigned. This way we no
longer insert the useless ChangeSomethingToTagged and then Smi check
the result sequences, i.e. mostly reduces the amount of useless code
being generated. But we also observe a few performance improvements
on some crypto benchmarks.

This would enable us to avoid the Smi canonicalization when going from
Float64 to Tagged completely and thus match the representation selection
of Crankshaft in many areas (which might reduce the amount of
polymorphism until we fix our object model).

A follow-up CL will do the same for CheckHeapObject.

BUG=v8:5267
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/2362173003 .

Cr-Commit-Position: refs/heads/master@{#39654}
2016-09-23 10:32:35 +00:00
benchmarks Revert "Refactoring: Make gtest testsuite the default." 2014-09-02 09:17:26 +00:00
build_overrides [inspector] Build inspector under v8_enable_inspector build flag. 2016-09-06 23:26:35 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [swarming] Remove hard-coded shared library configs 2016-07-28 07:18:15 +00:00
gypfiles [gn] Switch off gyp in runhooks by default 2016-09-09 14:23:14 +00:00
include [modules] Do path resolution relative to each module file in d8 2016-09-22 21:03:42 +00:00
infra Revert of [cq] Temporarily make failing chromium trybot experimental (patchset #1 id:1 of https://codereview.chromium.org/2352573002/ ) 2016-09-19 21:02:26 +00:00
samples Provide a convenience array buffer allocator 2016-06-29 07:42:40 +00:00
src [turbofan] Improve representation selection for Smi checking. 2016-09-23 10:32:35 +00:00
test [turbofan] Improve representation selection for Smi checking. 2016-09-23 10:32:35 +00:00
testing Use GTEST_LANG_CXX11 in V8 2016-07-25 13:06:42 +00:00
third_party/binutils Update binutils version to match Chromium. 2016-07-08 07:03:29 +00:00
tools [tools] Improve callstats.html 2016-09-22 20:58:36 +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] Copy MB from Chromium repo 2016-09-01 12:20:20 +00:00
.gn Disentangle gyp and gn files 2016-09-14 19:02:41 +00:00
.ycm_extra_conf.py Use C++11 / gnu++11, not 0x 2016-03-22 15:24:43 +00:00
AUTHORS [inspector] Initial import of v8_inspector. 2016-09-01 20:28:33 +00:00
BUILD.gn Revert of Pool implementation for zone segments (patchset #9 id:420001 of https://codereview.chromium.org/2335343007/ ) 2016-09-23 06:03:55 +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. 2016-09-23 03:28:10 +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 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
Makefile Remove NaCl support. 2016-07-27 07:50:31 +00:00
Makefile.android [build] Fix d8-for-Android builds 2016-05-20 12:10:45 +00:00
OWNERS Remove oth from OWNERS 2016-09-05 13:38:25 +00:00
PRESUBMIT.py Fix BUILD.gn files and add presubmit step 2016-09-19 10:59:41 +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 Use clang for snapshot_toolchain by default, except on ChromeOS. 2016-08-23 14:04:27 +00:00
WATCHLISTS Remove oth from v8 WATCHLISTS file. 2016-08-30 08:32:33 +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.