Module engine 

Low-level building blocks for Reed-Solomon encoding/decoding.

This is an advanced module which is not needed for simple usage or basic usage.

This module is relevant if you want to

• use rate module and need an Engine to use with it.
• create your own Engine.
• understand/benchmark/test at low level.

Engines

An Engine is an implementation of basic low-level algorithms needed for Reed-Solomon encoding/decoding.

• Naive
  • Simple reference implementation.
• NoSimd
  • Basic optimized engine without SIMD so that it works on all CPUs.
• Avx2
  • Optimized engine that takes advantage of the x86(-64) AVX2 SIMD instructions.
• Ssse3
  • Optimized engine that takes advantage of the x86(-64) SSSE3 SIMD instructions.
• Neon
  • Optimized engine that takes advantage of the AArch64 Neon SIMD instructions.
• DefaultEngine
  • Default engine which is used when no specific engine is given.
  • Automatically selects best engine at runtime.

Modules

tables

Lookup-tables used by Engine:s.

utils

A collection of utility functions and helpers to facilitate the implementation of the Engine trait.

Structs

Avx2

Optimized Engine using AVX2 instructions.

DefaultEngine

Engine that at runtime selects the best Engine.

Naive

Simple reference implementation of Engine.

NoSimd

Optimized Engine without SIMD.

ShardsRefMut

Mutable reference to a shard array.

Ssse3

Optimized Engine using SSSE3 instructions.

Constants

CANTOR_BASIS

Cantor basis used by the additive FFT over GF(2^16).

GF_BITS

Size of Galois field element GfElement in bits.

GF_MODULUS

GF_ORDER - 1

GF_ORDER

Galois field order, i.e. number of elements.

GF_POLYNOMIAL

Galois field polynomial.

SHARD_CHUNK_BYTES

Byte width of a shard chunk.

Traits

Engine

Trait for compute-intensive low-level algorithms needed for Reed-Solomon encoding/decoding.

Type Aliases

GfElement

Galois field element.