| commit | 3200cc600cd5f655ed638adcc2b73ad8eb9ef26a | [log] [tgz] |
|---|---|---|
| author | Benedikt Meurer <bmeurer@chromium.org> | Wed Nov 29 09:17:43 2017 |
| committer | Commit Bot <commit-bot@chromium.org> | Wed Nov 29 10:55:26 2017 |
| tree | f424f3f947609f4c3a7f3f1d6d6707d7638ee4d5 | |
| parent | c0a4680d701b1994dbdd32ca2a35cc5510ba6ecd [diff] |
[turbofan] Optimize String#slice(-1) calls. In TurboFan we can easily recognize calls to String.prototype.slice where the start parameter is -1 and the end parameter is either undefined or not present. These calls either return an empty string if the input string is empty, or the last character of the input string as a single character string. So we can just make use of the existing StringCharAt operator. This reduces the overhead of the String.prototype.slice calls from optimized code in the chai test of the web-tooling-benchmark significantly. We observe a 2-3% improvement on the test. Bug: v8:6936, v8:7137 Change-Id: Iebe02667446880f5760e3e8c80f8b7cc712df663 Reviewed-on: https://chromium-review.googlesource.com/795726 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Cr-Commit-Position: refs/heads/master@{#49704}
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.