Contact emails
gde...@chromium.org, natt...@chromium.org, zh...@chromium.org
Spec
Overview document: https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md
Proposal directory: https://github.com/WebAssembly/simd/tree/master/proposals/simd
Tag review: https://github.com/w3ctag/design-reviews/issues/487
Summary
The WebAssembly SIMD proposal defines a portable, performant subset of SIMD operations that map to vector instructions that are available across most modern hardware platforms.
This is purely a WebAssembly performance feature that adds WebAssembly operations and does not affect web API behavior, but is still useful for developers to be aware of as it can change performance characteristics of applications using WebAssembly.
Link to “Intent to Prototype” blink-dev discussion:
This links to the Intent to Implement discussion for Simd.js, which was the basis for the WebAssembly SIMD. The Spec section above has updated links for WebAssembly SIMD, as well as the Tag review.
Goals for experimentation
Performance:
The goal for this experiment is to determine the performance benefit of having WebAssembly SIMD enabled applications in production code, and determine real world performance numbers. We currently have data from isolated benchmarks, and demos, but these do not always reflect real world usage.
API Shape:
The SIMD proposal currently consists of a set of operations that are well supported across most modern hardware platforms. The set of instructions available on hardware is large and varied, and we are looking for feedback on whether this portable subset is sufficient for a cross section of applications.
Experimental timeline
M84-M89
Any risks when the experiment finishes?
The risk is a drop in performance for sites that were enhancing performance using WebAssembly SIMD operations.
Ongoing technical constraints
None.
Debuggability
WebAssembly SIMD needs debugging support in devtools for 128-bit values, as well as baseline compiler support in V8. Both of these efforts are ongoing. (Tracking bugs: crbug.com/v8/10347, crbug.com/v8/9909)
Will this feature be supported on all five Blink platforms supported by Origin Trials (Windows, Mac, Linux, Chrome OS, and Android)?
Yes.
Link to entry on the feature dashboard
https://www.chromestatus.com/feature/6533147810332672
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