Hi all,
We are preparing to ship the WebAssembly Branch Hints proposal in M136
which has been voted to phase 4 in the Wasm Community Group last July.
Chrome is now catching up with shipping it after requests from partners.
The feature is already implemented in Firefox.
The proposal was championed by Yuri Iozzelli from Leaning Technologies and
the V8 team was not involved in its standardization process. The
implementation has no effect on existing code by design which is why a
Finch trial would not yield any insights. We have a Chromium feature
available for a Finch kill-switch if necessary.
Thank you,
Emanuel
Contact emailsecmzieg...@chromium.org, jkumme...@chromium.org
ExplainerNone
Specification
https://github.com/WebAssembly/branch-hinting/blob/main/proposals/branch-hinting/Overview.md
Summary
Improves the performance of compiled WebAssembly code by informing the
engine that a particular branch instruction is very likely to take a
specific path. This allows the engine to make better decisions for code
layout (improving instruction cache hits) and register allocation.
https://github.com/WebAssembly/branch-hinting/blob/main/proposals/branch-hinting/Overview.md
Blink componentBlink>JavaScript>WebAssembly
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EJavaScript%3EWebAssembly%22>
TAG reviewNone
TAG review statusNot applicable
Risks
Interoperability and Compatibility
None
*Gecko*: No signal
*WebKit*: No signal
*Web developers*: No signals
*Other signals*:
WebView application risks
Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?
None
Debuggability
None
Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, ChromeOS, Android, and Android WebView)?No
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?No
Flag name on about://flagsNone
Finch feature nameV8Flag_experimental_wasm_branch_hinting
Requires code in //chrome?False
Estimated milestones
Shipping on desktop 136
Shipping on Android 136
Shipping on WebView 136
Anticipated spec changes
Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github issues
in the project for the feature specification) whose resolution may
introduce web compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
None
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5165273114738688?gate=5186994509185024
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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