U.S. patents available from 1976 to present.
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Single cycle dispatch delay in a multiple instruction dispatch mechanism of a data processing system

Patent 5479622 Issued on December 26, 1995. Estimated Expiration Date: Icon_subject November 14, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

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Parallel processing method and apparatus for increasing processing throughout by parallel processing low level instructions having natural concurrencies
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Method and apparatus for guaranteeing the logical integrity of data in the general purpose registers of a complex multi-execution unit uniprocessor
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Inventors

Application

No. 339315 filed on 11/14/1994

US Classes:

712/215, Simultaneous issuance of multiple instructions712/23, Superscalar712/216DYNAMIC INSTRUCTION DEPENDENCY CHECKING, MONITORING OR CONFLICT RESOLUTION

Examiners

Primary: Treat, William M.

Attorney, Agent or Firm

International Class

G06F 009/38

Abstract

A data processing system including a circuit for storing a plurality of instructions in a sequence together with a circuit for fetching a plurality of instructions. A circuit is provided for dispatching a plurality of the instructions to one or more processors for execution during a single computation cycle. A control circuit is connected to the dispatching circuit to delay the dispatching of an instruction. when the instruction has an execution result that is dependent upon a previous instruction execution that will set at least one bit in a condition register. The delayed instruction is delayed until that condition register has been accordingly set.

Other References

  • Acosta et al., "An Instruction Issuing Approach to Enhancing Performance in Multiple Functional Unit Processors," IEEE Transactions on Computers, vol. C-35, No. 9, Sep. 1986
  • IBM Technical Disclosure Bulletin, entitled "Condition Code and Branch Architecture for High Performance Processors", vol. 25, No. 1, Jun. 1982, pp. 136-137
  • IBM Technical Disclosure Bulletin, "Condition Code Facility", vol. 29, No. 7, Dec. 1986, pp. 3176-3177
  • IBM Technical Disclosure Bulletin, entitled "Multiple Queued Condition Codes", vol. 31, No. 2, Jul. 1988, pp. 294-296
  • Proceedings of the 2nd International Conference on Architectural Support for Programming Languages and Operating Systems, Palo Alto, Calif., 5th-8th Oct., 1987, pp. 199-204 by J. E. Smith et al, "The ZS-1 Central Processor"
  • IBM Technical Disclosure Bulletin, T. Agerwala, vol. 25, No. 1, Jun. 1982, "Improved Condition Code and Branch Handling for Model 91-Like Implementation of the IBM System/370 Architecture", pp. 134-135
  • "Streamlined Instruction Processor, User's Manual", AM29000, copyright 1987 Advanced Micro Devices, pp. 3-30 thru 3-32
  • "Reduced Instruction Set Computer (RISC) User's Manual", MC88100, Motorola Microprocessor Group, pp. 1-11 thru 1-12
  • "The Architecture of Pipelined Computers", Peter Kogge. Sections 4.2.3 and 6.3.
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