Macro simd_arch_mod 

macro_rules! simd_arch_mod {
    ($(#[cfg $cfg:tt])* $(#[cfg_attr $cfg_attr:tt])? $arch:ident, $mod:ident, $($typ:ident),*) => { ... };
}

Defines a module which implements TryFromBytes, FromZeros, FromBytes, and IntoBytes for a set of types from a module in core::arch.

$arch is both the name of the defined module and the name of the module in core::arch, and $typ is the list of items from that module to implement FromZeros, FromBytes, and IntoBytes for.