GB1480209A - Digital computers - Google Patents

Digital computers

Info

Publication number
GB1480209A
GB1480209A GB1668573A GB1668573A GB1480209A GB 1480209 A GB1480209 A GB 1480209A GB 1668573 A GB1668573 A GB 1668573A GB 1668573 A GB1668573 A GB 1668573A GB 1480209 A GB1480209 A GB 1480209A
Authority
GB
United Kingdom
Prior art keywords
bit
instruction
computer
response
word
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.)
Expired
Application number
GB1668573A
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.)
DATA LOOP Ltd
Original Assignee
DATA LOOP 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 DATA LOOP Ltd filed Critical DATA LOOP Ltd
Priority to GB1668573A priority Critical patent/GB1480209A/en
Publication of GB1480209A publication Critical patent/GB1480209A/en
Expired 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
    • G06F9/30003—Arrangements for executing specific machine instructions
    • G06F9/30072—Arrangements for executing specific machine instructions to perform conditional operations, e.g. using predicates or guards

Landscapes

  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Executing Machine-Instructions (AREA)

Abstract

1480209 Conditional instruction execution DATA-LOOP Ltd 3 July 1974 [6 April 1973] 16685/73 Heading G4A In a digital computer each instruction in a sequence thereof is executed only if a predetermined test bit is 0 or, if the test bit is 1, only if a condition register, having a plurality of bit positions each representing a respective condition present in the computer, contains 1 bits in all positions in which a 1 bit is present in a subsidiary word associated with the instruction, otherwise it is skipped and the next instruction accessed. The test bit may be one bit in the instruction itself or a given bit in a predetermined register. Respective bits of the associated word are set in response to conditions within the computer, e.g. the result of a calculation is zero, arithmetic unit overflows &c. The associated word may be preset or may be developed in response to one or more previous instructions.
GB1668573A 1974-07-03 1974-07-03 Digital computers Expired GB1480209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1668573A GB1480209A (en) 1974-07-03 1974-07-03 Digital computers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1668573A GB1480209A (en) 1974-07-03 1974-07-03 Digital computers

Publications (1)

Publication Number Publication Date
GB1480209A true GB1480209A (en) 1977-07-20

Family

ID=10081798

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1668573A Expired GB1480209A (en) 1974-07-03 1974-07-03 Digital computers

Country Status (1)

Country Link
GB (1) GB1480209A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211487A1 (en) * 1985-06-28 1987-02-25 Hewlett-Packard Company Conditional operations in computers
EP0223273A1 (en) * 1985-10-18 1987-05-27 Koninklijke Philips Electronics N.V. A data-processing apparatus provided with a finite-state machine to perform a program jump
EP0465328A2 (en) * 1990-06-29 1992-01-08 Digital Equipment Corporation Branch elimination in a reduced instruction set processor
GB2282245A (en) * 1993-09-23 1995-03-29 Advanced Risc Mach Ltd Aborting execution of instructions.
GB2315890A (en) * 1996-07-30 1998-02-11 Mitsubishi Electric Corp Microprocessor having conditional-execution instructions
EP1296227B1 (en) * 2001-09-20 2017-08-23 Socionext Inc. Valid instruction dispatching and execution
GB2603949A (en) * 2021-02-22 2022-08-24 Caterpillar Paving Products Inc Method for controlling height of work machines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211487A1 (en) * 1985-06-28 1987-02-25 Hewlett-Packard Company Conditional operations in computers
EP0223273A1 (en) * 1985-10-18 1987-05-27 Koninklijke Philips Electronics N.V. A data-processing apparatus provided with a finite-state machine to perform a program jump
EP0465328A2 (en) * 1990-06-29 1992-01-08 Digital Equipment Corporation Branch elimination in a reduced instruction set processor
EP0465328A3 (en) * 1990-06-29 1993-12-01 Digital Equipment Corp Branch elimination in a reduced instruction set processor
GB2282245A (en) * 1993-09-23 1995-03-29 Advanced Risc Mach Ltd Aborting execution of instructions.
GB2282245B (en) * 1993-09-23 1998-04-15 Advanced Risc Mach Ltd Execution of data processing instructions
US5961633A (en) * 1993-09-23 1999-10-05 Arm Limited Execution of data processing instructions
GB2315890A (en) * 1996-07-30 1998-02-11 Mitsubishi Electric Corp Microprocessor having conditional-execution instructions
GB2315890B (en) * 1996-07-30 1999-09-22 Mitsubishi Electric Corp Microprocessor having conditional execution instructions
US5996070A (en) * 1996-07-30 1999-11-30 Mitsubishi Denki Kabushiki Kaisha Microprocessor capable of executing condition execution instructions using encoded condition execution field in the instructions
EP1296227B1 (en) * 2001-09-20 2017-08-23 Socionext Inc. Valid instruction dispatching and execution
GB2603949A (en) * 2021-02-22 2022-08-24 Caterpillar Paving Products Inc Method for controlling height of work machines

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee