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. 09, 1998
Filed:
Nov. 20, 1995
Deepak Rana, Bethlehem, PA (US);
David A Schroter, Round Rock, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus for supporting speculative execution of count and link register modifying instructions in a microprocessor is provided. The apparatus includes a queue of rename buffers storing count/link register operand data resulting from speculatively executed instructions that modify a count/link register. The queue contains a set of control buffers, wherein each control buffer contains control bits associated with a rename buffer, the control bits including an instruction identifier tag identifying a speculatively executed instruction, the operand data of the speculatively executed instruction being stored in the associated rename buffer, and an available bit indicating when the operand data no longer needs to be stored in the associated rename buffer. The apparatus control logic sets the control bits for each control buffer, including setting the instruction identifier tag to the value indicated by a dispatch unit, and selectively sets or resets the available bit based on resolution of the speculatively executed instruction.