Macro algorithm_simd 

macro_rules! algorithm_simd {
    ($feat:expr) => { ... };
}

Macros requires newtypes in scope: SimdU8Value - implementation of SIMD primitives SimdInput - which holds 64 bytes of SIMD input TempSimdChunk - correctly aligned TempSimdChunk, either TempSimdChunkA16 or TempSimdChunkA32