commit | e65c0b257898ec1773ca01235c4d8cf02abbdbbd | [log] [tgz] |
---|---|---|
author | Benedikt Meurer <bmeurer@chromium.org> | Mon Oct 02 08:50:22 2017 |
committer | Commit Bot <commit-bot@chromium.org> | Mon Oct 02 09:21:37 2017 |
tree | ab7f4325d72a563c9c15e995f8a219f8de7be1ee | |
parent | 9debe4411ceadd7c76843d26471968f40d31dd6b [diff] |
[turbofan] Don't go MEGAMORPHIC when storing oddballs to typed arrays. The KEYED_STORE_IC was never able to deal with stores to typed arrays where the value being stored is not already a Number (i.e. either a Smi or a HeapNumber). By extending it to also handle Oddballs (i.e. true, false, undefined and null) and teaching TurboFan to also perform the appropriate check plus the truncation to Number, we can easily support this use case as well. On the micro-benchmark in the bug report, we go from typedArrayStoreBool: 2975 ms. typedArrayStoreInt: 44 ms. to typedArrayStoreBool: 43 ms. typedArrayStoreInt: 44 ms. so that's roughly a 70x performance boost. Bug: chromium:287773 Change-Id: I227419aeabc3f5b6793aa280a95448d03ac2f2dd Reviewed-on: https://chromium-review.googlesource.com/691731 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Michael Stanton <mvstanton@chromium.org> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org> Cr-Commit-Position: refs/heads/master@{#48257}
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.