12e37399e8
An improvement to generic shuffle improvement (https://crrev.com/c/2152853) required a temporary SIMD register to hold the mask, rather than pushing it onto a stack. The temporary register requires that we UseUniqueRegister on the inputs, to prevent aliasing, as we will write to the temp. However, we only need this for the generic shuffle. We accidentally over-constraint all other pattern matched shuffles, since they don't use any temps. On a ~2000 line function containing ~150 shuffles (not all of which are generic shuffles), we get 16 less instruction in the native code, and actually see a very small improvement in the overall benchmarks. Bug: v8:11270 Change-Id: I09974f7615e4b8f5e2416ed17ca47cc7613fd6b1 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2591857 Reviewed-by: Bill Budge <bbudge@chromium.org> Commit-Queue: Zhi An Ng <zhin@chromium.org> Cr-Commit-Position: refs/heads/master@{#71818} |
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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.