Circuit for executing conditional branch instructions in pipeline process

摘要

A circuit for executing conditional branch instructions in a pipeline process comprises registers for retaining condition codes settled set or determined at different stages, respectively, registers for retaining pipeline tags identifying instructions at the respective stages and indicating the stage where the condition codes are settled or set by the instructions, and a branch controller for deciding whether the settlement of condition codes for conditional branch instructions existing at the respective stage has occured responsive to the tags in a plurality of stages, and for selecting the settled condition codes from among the condition codes stored in the registers and indicating whether a branch should be performed.