Feature gate: #![feature(portable_simd)]

This is a tracking issue for the future feature chartered in RFC 2977, with the intent of creating something akin to the design in RFC 2948 (rust-lang/rfcs#2948): a portable SIMD library (std::simd).

Portable SIMD project group: https://github.com/rust-lang/project-portable-simd
Implementation: https://github.com/rust-lang/portable-simd

More discussion can be found in the #project-portable-simd zulip stream.

Steps

• Implement the experimental feature behind a feature gate:
  • pub use core::simd; #89167
• Define the semantics explicitly.
• Write up an RFC detailing the design and defined semantics.
• Adjust documentation (see instructions on rustc-dev-guide)
• Stabilization PR (see instructions on rustc-dev-guide)

Unresolved Questions

• What will the overall design be?
• What are the ideal semantics for Masks?
• Are there any limits or vector sizes we should not support?
• How should these types interop with types like Saturating, NonZero, etc.?

Implementation History

• pub use core::simd; #89167
• Add [T]::as_simd(_mut) #91479