Patents by Inventor P. Geoffrey Lowny

P. Geoffrey Lowny has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for propagating exception conditions of a computer system
    Patent number: 5428807
    Abstract: There is provided a mechanism for propagating exception conditions in a computer system when instructions are subject to exception conditions. The apparatus includes a set of data registers for storing data manipulated by the instructions of the computer system, and a set of state registers for storing speculative states of data manipulated by the instructions, there being one state register associated with each data register. Furthermore, the apparatus includes a logic circuit, coupled to the set of state registers, for propagating the states from a source one of the state registers to a destination one of the state registers, if data stored in an associated source one of the data registers are used as a source for an associated destination one of data registers, and if data stored in the source data register were manipulated by a particular instruction subject to an exception condition.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: June 27, 1995
    Assignee: Digital Equipment Corporation
    Inventors: Francis X. McKeen, Michael C. Adler, Joel S. Emer, Robert P. Nix, David J. Sager, P. Geoffrey Lowny