Execution unit and method for executing performance critical and non- performance critical arithmetic instructions in separate pipelines

摘要

A CPU (central processing unit) of a computer that comprises an issue unit and an execution unit. The issue unit selectively issues arithmetic instructions of a predefined arithmetic instruction type as performance critical arithmetic instructions and non-performance critical arithmetic instructions. The execution unit comprises a performance critical pipeline to execute the performance critical arithmetic instructions. The execution unit also comprises a non- performance critical pipeline to execute the non-performance critical arithmetic instructions.