This repository contains two main crates:
core_arch implements core::arch - Rust's core library architecture-specific intrinsics, and
std_detect implements std::detect - Rust's standard library run-time CPU feature detection.
The std::simd component now lives in the packed_simd_2 crate.
This repository is linked to rust-lang/rust as a josh subtree. You can use the rustc-josh-sync tool to perform synchronization.
You can find a guide on how to perform the synchronization here.