Blackout logic for dual execution unit processor
CA 2123448 C · Owner: International Business Machines Corporation · Inventors: Spencer, Alexander K.; Ray, David S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method provides additional logic in both execution units of a dual execution unit processing in order to determine if the instruction is interruptible. Additionally backout logic is provided for saving the contents of unique registers. The backout logic uses two decodes to determine if the instruction currently executing modifies the unique registers. It is possible for a single instruction to modify more than one unique register. The backout logic of the present invention resides in both of the execution units and particularly in the unit which contains the unique register being modified by the executing instruction. If an instruction is being executed which modifies one …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 12, 1994 and granted October 13, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.