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:
Nov. 30, 1999
Filed:
Mar. 11, 1997
Ute Gaertner, Schonaich, DE;
Klaus Jorg Getzlaff, Schonaich, DE;
Thomas Koehler, Holzgerlingen, DE;
Erwin Pfeffer, Holzgerlingen, DE;
International Business Machines Corporation, Armonk, NY (US);
Abstract
The invention relates to the area of register renaming and allocation in superscalar computer systems. When a multitude of instructions in the instruction stream reads from or writes to a certain logical register, said logical register will have to be represented by a multitude of physical registers. Therefore, there have to exist several physical rename registers per logical register. The oldest one of said rename registers defines the architected state of the computer system, the in-order state. The invention provides a method for administration of the various register instances. Both the registers representing the in-order state and the various rename instances are kept in one common circular buffer. There exist two pointers per logical register: The first one, the in-order pointer, points to the register that represents the in-order state, the second one, the rename pointer, points to the most recent rename instance.