CA2064819A1 - Cpu pipeline having register file bypass on update/access address compare - Google Patents

Cpu pipeline having register file bypass on update/access address compare

Info

Publication number
CA2064819A1
CA2064819A1 CA2064819A CA2064819A CA2064819A1 CA 2064819 A1 CA2064819 A1 CA 2064819A1 CA 2064819 A CA2064819 A CA 2064819A CA 2064819 A CA2064819 A CA 2064819A CA 2064819 A1 CA2064819 A1 CA 2064819A1
Authority
CA
Canada
Prior art keywords
register file
alu
update
multiplexer
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2064819A
Other languages
French (fr)
Other versions
CA2064819C (en
Inventor
Stephen W. Olson
James B. Macdonald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SK Hynix Inc
Original Assignee
Stephen W. Olson
James B. Macdonald
Wang Laboratories, Inc.
Lg Semicon Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stephen W. Olson, James B. Macdonald, Wang Laboratories, Inc., Lg Semicon Co., Ltd. filed Critical Stephen W. Olson
Publication of CA2064819A1 publication Critical patent/CA2064819A1/en
Application granted granted Critical
Publication of CA2064819C publication Critical patent/CA2064819C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/38—Concurrent instruction execution, e.g. pipeline, look ahead
    • G06F9/3824—Operand accessing
    • G06F9/3826—Bypassing or forwarding of data results, e.g. locally between pipeline stages or within a pipeline stage
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/38—Concurrent instruction execution, e.g. pipeline, look ahead
    • G06F9/3824—Operand accessing

Abstract

An A output and a B output of a register file (16) are each provided to an associated multiplexer (18, 20). Each multiplexer has as a further input a bus (CB00:31) that conveys a result from an ALU (22) via an ALU shifter (28). Outputs of the multiplexers are provided to corresponding A or B inputs of the ALU. Each multiplexer is controlled by an associated register file address comparator (24, 26). The address comparators each have as an input corresponding register file A and B update and access addresses. The address comparators compare their associated register file update and access addresses to determine if the register file register selected for access is equal to the register file register selected for update. If these two addresses are found to be equal it is indicated that the result of an ALU operation during an instruction cycle N is to be used as an operand for an ALU operation during a cycle N + 1. When this condition is detected the output of the associated address comparator enables the corresponding multiplexer select input to gate the ALU result directly to the corresponding input of the ALU, thereby effectively bypassing the register file.
CA002064819A 1989-09-11 1990-03-28 Cpu pipeline having register file bypass on update/access address compare Expired - Lifetime CA2064819C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/405,794 US5123108A (en) 1989-09-11 1989-09-11 Improved cpu pipeline having register file bypass and working register bypass on update/access address compare
US405,794 1989-09-11
PCT/US1990/001643 WO1991003784A1 (en) 1989-09-11 1990-03-28 Improved cpu pipeline having register file bypass on update/access address compare

Publications (2)

Publication Number Publication Date
CA2064819A1 true CA2064819A1 (en) 1991-03-12
CA2064819C CA2064819C (en) 2000-02-08

Family

ID=23605267

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002064819A Expired - Lifetime CA2064819C (en) 1989-09-11 1990-03-28 Cpu pipeline having register file bypass on update/access address compare

Country Status (7)

Country Link
US (1) US5123108A (en)
EP (1) EP0491693B1 (en)
JP (1) JP2840444B2 (en)
AU (1) AU643432B2 (en)
CA (1) CA2064819C (en)
DE (1) DE69027932T2 (en)
WO (1) WO1991003784A1 (en)

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JPH0594546A (en) * 1991-02-05 1993-04-16 American Teleph & Telegr Co <Att> Digital processor
JPH04275628A (en) * 1991-03-01 1992-10-01 Mitsubishi Electric Corp Arithmetic processor
JP2693651B2 (en) * 1991-04-30 1997-12-24 株式会社東芝 Parallel processor
US5488729A (en) * 1991-05-15 1996-01-30 Ross Technology, Inc. Central processing unit architecture with symmetric instruction scheduling to achieve multiple instruction launch and execution
JPH0520066A (en) * 1991-07-16 1993-01-29 Mitsubishi Electric Corp Parallel computer
JP2539974B2 (en) * 1991-11-20 1996-10-02 富士通株式会社 Register read control method in information processing apparatus
WO1993017386A1 (en) * 1992-02-28 1993-09-02 Oki Electric Industry Co., Ltd. Cache memory apparatus
JPH0612107A (en) * 1992-06-02 1994-01-21 Mitsubishi Electric Corp Sequence arithmetic processor and sequence arithmetic processing unit
AU4219693A (en) * 1992-09-30 1994-04-14 Apple Computer, Inc. Inter-task buffer and connections
DE69415126T2 (en) * 1993-10-21 1999-07-08 Sun Microsystems Inc Counterflow pipeline processor
US5704052A (en) * 1994-11-06 1997-12-30 Unisys Corporation Bit processing unit for performing complex logical operations within a single clock cycle
US5870581A (en) * 1996-12-20 1999-02-09 Oak Technology, Inc. Method and apparatus for performing concurrent write operations to a single-write-input register file and an accumulator register
US5799163A (en) * 1997-03-04 1998-08-25 Samsung Electronics Co., Ltd. Opportunistic operand forwarding to minimize register file read ports
US5996065A (en) * 1997-03-31 1999-11-30 Intel Corporation Apparatus for bypassing intermediate results from a pipelined floating point unit to multiple successive instructions
US5872986A (en) * 1997-09-30 1999-02-16 Intel Corporation Pre-arbitrated bypassing in a speculative execution microprocessor
US6131108A (en) * 1998-03-31 2000-10-10 Lsi Logic Corporation Apparatus, and associated method, for generating multi-bit length sequences
US6088784A (en) * 1999-03-30 2000-07-11 Sandcraft, Inc. Processor with multiple execution units and local and global register bypasses
EP1124181B8 (en) * 2000-02-09 2012-03-21 Texas Instruments Incorporated Data processing apparatus
US7206927B2 (en) * 2002-11-19 2007-04-17 Analog Devices, Inc. Pipelined processor method and circuit with interleaving of iterative operations
US20040249782A1 (en) * 2003-06-04 2004-12-09 International Business Machines Corporation Method and system for highly efficient database bitmap index processing
US20190377580A1 (en) * 2008-10-15 2019-12-12 Hyperion Core Inc. Execution of instructions based on processor and data availability
US9152427B2 (en) 2008-10-15 2015-10-06 Hyperion Core, Inc. Instruction issue to array of arithmetic cells coupled to load/store cells with associated registers as extended register file
TWI607375B (en) * 2012-11-05 2017-12-01 義隆電子股份有限公司 Numerical comparing method of a processor and the processor applied to an electronic device
US9569214B2 (en) * 2012-12-27 2017-02-14 Nvidia Corporation Execution pipeline data forwarding

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594682A (en) * 1982-12-22 1986-06-10 Ibm Corporation Vector processing
GB8401807D0 (en) * 1984-01-24 1984-02-29 Int Computers Ltd Pipelined data processing apparatus
AU553416B2 (en) * 1984-02-24 1986-07-17 Fujitsu Limited Pipeline processing
JPS6386033A (en) * 1986-09-30 1988-04-16 Fujitsu Ltd Pipeline processing system
JPH0810430B2 (en) * 1986-11-28 1996-01-31 株式会社日立製作所 Information processing device
US4901267A (en) * 1988-03-14 1990-02-13 Weitek Corporation Floating point circuit with configurable number of multiplier cycles and variable divide cycle ratio

Also Published As

Publication number Publication date
JPH05503381A (en) 1993-06-03
AU5353990A (en) 1991-04-08
CA2064819C (en) 2000-02-08
WO1991003784A1 (en) 1991-03-21
US5123108A (en) 1992-06-16
JP2840444B2 (en) 1998-12-24
EP0491693A1 (en) 1992-07-01
DE69027932T2 (en) 1997-02-27
DE69027932D1 (en) 1996-08-29
AU643432B2 (en) 1993-11-18
EP0491693B1 (en) 1996-07-24

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EEER Examination request
MKLA Lapsed
MKEC Expiry (correction)

Effective date: 20121202