US Patent 7664915 High performance raid-6 system architecture with pattern matching

An acceleration unit offloads computationally intensive tasks from a processor. The acceleration unit includes two data processing paths each having an Arithmetic Logical Unit and sharing a single multiplier unit. Each data processing path may perform configurable operations in parallel on a same data. Special multiplexer paths and instructions are provided to allow P and Q type syndromes to be computed on a stripe in a single-pass of the data through the acceleration unit.