| commit | cd9724d4b48bce53dff968635f72252e3ec687d4 | [log] [tgz] |
|---|---|---|
| author | bmeurer <bmeurer@chromium.org> | Thu Feb 09 07:23:08 2017 |
| committer | Commit bot <commit-bot@chromium.org> | Thu Feb 09 07:23:08 2017 |
| tree | f5ea2c7665ecaed418f754349535683018fa98cc | |
| parent | 1a989bdeefdc679745215ae547007773edb3d29e [diff] |
[turbofan] Utilize the fact that empty string is canonicalized.
Since the empty string is canonical HeapObject now, we can use
this fact to optimize
- strict equality comparisons with the empty string to a
simple ReferenceEqual operation, and
- optimize ToBoolean to avoid instance type checks completely.
Drive-by-fix: Allow InternalizedString for Type::HeapConstant
in the type system. This is safe, since InternalizedStrings
can be compared to other heap constants by reference (except
for non-InternalizedStrings, which are excluded from the
HeapConstant type).
BUG=v8:5267
R=yangguo@chromium.org
Review-Url: https://codereview.chromium.org/2681273002
Cr-Commit-Position: refs/heads/master@{#43050}
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
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/*
Please follow the instructions mentioned on the V8 wiki.