EXPEDITED EXECUTION OF PIPELINED COMMAND HAVING SELF-ORDERING OPERAND PROCESSING REQUIREMENTS

A pipelined computer which process operand data through a sequence of D,A,T,B,X and W stages includes a sidetrack queue. Data which exits the B stage prematurely, before the X stage is ready to immediately process such data, is held over in the sidetrack queue and presented to the X stage at a later time. The sidetracking mechanism is used to speed processing of rate-variable operand-consuming instructions such as the EDIT and EDMK commands.