Hi all --
There are a few features that we pushed out of the previous SIMD proposal in the interests of time, as well as a few features that have been requested by internal Apple adopters of Swift as they've started using the new SIMD APIs.
A first draft of the pitch is here: https://github.com/stephentyrone/swift-evolution/blob/simd-additions/proposals/0000-simd-additions.md. Note that there's (as of now) no ABI stability, etc sections in the pitch. These are all purely additive changes to the library.
Looking forward to everyone's thoughts.