d16eefe0f2
We currently canonicalize shuffles in the architecture specific instruction selector. This has the drawback that if we want to pattern match on nodes that have a shuffle as input, they need to individually canonicalize the shuffle. There can also be a subtle bug if we canonicalize the same shuffle node twice (see bug for details). This moves the canonicalization to "construction time", in wasm-compiler, when building the graph. As such, any pattern matches in instruction-selector will only need to deal with canonicalized shuffles. We introduce a new kind of parameter for shuffle nodes, ShuffleParameter, to store the 16 bytes plus a bool indicating if this is a swizzle. A swizzle essentially: inputs to the shuffle are the same or all indices only touch 1 input. We calculate this when canonicalizing, so store this bit of information inside of the node's parameter. We update the tests in x64 to handle special cases where, even though the node's inputs are not swapped (due to canonicalization), they need to be swapped for the specific instruction selected (e.g. palignr). The test data also contains canonicalized shuffles, so we have to manually canonicalize them. Bug: v8:11542 Change-Id: I4e78082267bd03d6caedf43d68d81ef3f5f364a8 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2762420 Reviewed-by: Bill Budge <bbudge@chromium.org> Commit-Queue: Zhi An Ng <zhin@chromium.org> Cr-Commit-Position: refs/heads/master@{#73495} |
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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.