The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 1995
Filed:
Jun. 17, 1993
Francis X McKeen, Westborough, MA (US);
Michael C Adler, Lexington, MA (US);
Joel S Emer, Acton, MA (US);
Robert P Nix, Concord, MA (US);
David J Sager, Acton, MA (US);
P Geoffrey Lowny, Concord, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
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.