"Implicit" use that you believe exists isn't actually SIMD. JIT-ers in the browsers can implicitly use SSE instruction set as such, but not in the efficient SIMD way (specifically under the constrains of JIT-ing reasonably fast and not possibly knowing the types). What is here developed is the support for the explicit use of SIMD instructions by the JavaScript programmer:
var a = SIMD.float32x4(1, 2, 3, 4);
var b = SIMD.float32x4(5, 6, 7, 8);
var c = SIMD.float32x4.add(a,b);
The benefit of such instructions is that they are fully typed and can easily map directly to the machine instructions. And of course, you don't have to write such code unless you actually program something that calculates a lot.
It is a Google/Mozilla/Intel collaboration, started 2013:
is already signed by people from Google, Intel and Mozilla and Intel obviously actively works with the browser vendors.
"This paper introduces an explicit SIMD programming model for Dart and JavaScript, we show that it can be compiled to efficient x86/SSE or ARM/Neon code by both Dart and JavaScript virtual machines achieving a 300%-600% speed increase across a variety of benchmarks. The result of this work is that more sophisticated and performant applications can be built to run in web browsers. The ideas introduced in this paper can also be used in other dynamically typed scripting languages to provide a similarly performant interface to SIMD co-processors."
What I don't know is if Intel keeps some patents or some sources. That could explain that Intel must be involved. But maybe they simply like to be involved.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/SIMD...
The benefit of such instructions is that they are fully typed and can easily map directly to the machine instructions. And of course, you don't have to write such code unless you actually program something that calculates a lot.It is a Google/Mozilla/Intel collaboration, started 2013:
https://www.youtube.com/watch?v=CbMXkbqQBcQ
The initial proposal was by John McCutchan, who works in the Google's Dart team but the paper
http://dl.acm.org/citation.cfm?id=2568066
is already signed by people from Google, Intel and Mozilla and Intel obviously actively works with the browser vendors.
"This paper introduces an explicit SIMD programming model for Dart and JavaScript, we show that it can be compiled to efficient x86/SSE or ARM/Neon code by both Dart and JavaScript virtual machines achieving a 300%-600% speed increase across a variety of benchmarks. The result of this work is that more sophisticated and performant applications can be built to run in web browsers. The ideas introduced in this paper can also be used in other dynamically typed scripting languages to provide a similarly performant interface to SIMD co-processors."
What I don't know is if Intel keeps some patents or some sources. That could explain that Intel must be involved. But maybe they simply like to be involved.