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Deepti Gandluri df546bd15f [wasm-simd] Add ExtractLaneU operations 
This CL implements i8x16.extract_lane_u, i16x8.extract_lane_u operations by
changing the default narrow extract operations to be unsigned. The
sign-extended extracts are implemented on top of the unsigned extracts
with an additional extend compiler node.
For IA32/X64, the codegen effectively remains the same -

0x389332bc32a3    63  660f3a14c900   pextrb rcx,xmm1,0
0x389332bc32a9    69  0fbec9         movsxbl rcx,rcx

0x389332bc32a3    63  660f3a14c900   pextrb rcx,xmm1,0
0x389332bc32a9    69  0fbec9         movsxbl rcx,rcx

On ARM, this adds an additional sxt instruction for the signed extracts.

Bug: v8:8460
Change-Id: I67f14b2b860ff8cc86ffbb2f65c7ef7de32da83f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1846711
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64172}
2019-10-09 00:58:04 +00:00
benchmarks Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
build_overrides Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
custom_deps Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
docs Add OWNERS for docs/ 2019-05-15 12:06:15 +00:00
gni Enable v8_use_snapshot by default for 64-bit Windows cross builds 2019-10-07 14:33:32 +00:00
include Add full heap dump crash key trigger and use it for crashes under ScavengePage. 2019-10-08 16:20:54 +00:00
infra [ptr-compr][arm64] Temporarily enable pointer compression on arm64 2019-10-07 13:27:21 +00:00
samples [cleanup] Drop some occurrences of Isolate::Current 2019-06-26 19:39:21 +00:00
src [wasm-simd] Add ExtractLaneU operations 2019-10-09 00:58:04 +00:00
test [wasm-simd] Add ExtractLaneU operations 2019-10-09 00:58:04 +00:00
testing Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
third_party Remove unnecessary HasOwnProperty check from Array#sort 2019-09-18 12:39:43 +00:00
tools [postmortem] add metadata for the new DescriptorArray layout 2019-10-08 17:43:55 +00:00
.clang-format
.clang-tidy
.editorconfig
.flake8 Add .flake8 to allow for python style checking. 2019-07-19 21:44:03 +00:00
.git-blame-ignore-revs Add recent code rewrite to .git-blame-ignore-revs 2019-05-23 10:38:45 +00:00
.gitattributes
.gitignore Remove MIPS(64) builders from V8 infra 2019-09-16 11:20:11 +00:00
.gn [build] Dynamically decide if to use system xcode 2019-07-29 08:20:24 +00:00
.vpython [tools] Implement confidence-based number of runs 2019-05-09 09:42:28 +00:00
.ycm_extra_conf.py
AUTHORS [log] report code relocation through CodeEventHandler 2019-09-24 10:50:05 +00:00
BUILD.gn [postmortem] add metadata for the new DescriptorArray layout 2019-10-08 17:43:55 +00:00
ChangeLog
CODE_OF_CONDUCT.md
codereview.settings
COMMON_OWNERS Rename clemensh to clemensb in OWNERS 2019-09-26 08:44:44 +00:00
DEPS Roll test262 2019-10-08 17:35:06 +00:00
ENG_REVIEW_OWNERS Add eng review owners as escalation path 2019-05-15 19:12:10 +00:00
INFRA_OWNERS Clean up infra owners 2019-05-15 11:18:43 +00:00
INTL_OWNERS Add missing owners files 2019-05-31 07:21:01 +00:00
LICENSE [wasm] Draft version of C/C++ Wasm API 2019-04-17 16:00:26 +00:00
LICENSE.fdlibm
LICENSE.strongtalk
LICENSE.v8
LICENSE.valgrind
MIPS_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
OWNERS Add syg@chromium.org as DEPS owner for test262 rolls 2019-09-17 19:29:11 +00:00
PPC_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
PRESUBMIT.py Re-check all files on a DEPS change 2019-09-30 09:23:36 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
S390_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
WATCHLISTS Move remaining files in src/ 2019-05-24 18:24:36 +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://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.