This crate no londer builds as of Rust 1.33 nightly due to the removal of compiler features that this crates depends on. See the packed_simd crate instead.
simd offers a basic interface to the SIMD functionality of CPUs. (Note: Even prior to Rust 1.33, this crate fails to build unless the target is aarch64, x86_64, i686 (i.e. SSE2 enabled; not i586) or an ARMv7 target (thumb or not) with NEON enabled.)