05067069 is referenced by 78 patents and cites 12 patents.

To increase the performance of a pipelined processor executing various classes of instructions, the classes of instructions are executed by respective functional units which are independently controlled and operated in parallel. The classes of instructions include integer instructions, floating point instructions, multiply instructions, and divide instructions. The integer unit, which also performs shift operations, is controlled by the microcode execution unit to handle the wide variety of integer and shift operations included in a complex, variable-length instruction set. The other functional units need only accept a control command to initiate the operation to be performed by the functional unit. The retiring of the results of the instructions need not be controlled by the microcode execution unit, but instead is delegated to a separate retire unit that services a result queue. When the microcode execution unit determines that a new operation is required, an entry is inserted into the result queue. The entry includes all the information needed by the retire unit to retire the result once the result is available from the respective functional unit. The retire unit services the result queue by reading a tag in the entry at the head of the queue to determine the functional unit that is to provide the result. Once the result is available and the destination specified by the entry is also available, the result is retired in accordance with the entry, and the entry is removed from the queue.

Title
Control of multiple functional units with parallel operation in a microcoded execution unit
Application Number
7/306832
Publication Number
5067069
Application Date
February 3, 1989
Publication Date
November 19, 1991
Inventor
Ronald M Salett
Framingham
MA, US
Francis X McKeen
Westboro
MA, US
William R Grundmann
Hudson
MA, US
Tryggve Fossum
Northboro
MA, US
Elaine H Fite
Northboro
MA, US
Agent
Arnold White & Durkee
Assignee
Digital Equipment Corporation
MA, US
IPC
G06F 9/38
G06F 9/30
G06F 9/28
G06F 9/22
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