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:
Apr. 23, 2013
Filed:
Jun. 30, 2011
Yuan C. Chou, Los Gatos, CA (US);
Jared C. Smolens, San Jose, CA (US);
Jeffrey S. Brooks, Austin, TX (US);
Yuan C. Chou, Los Gatos, CA (US);
Jared C. Smolens, San Jose, CA (US);
Jeffrey S. Brooks, Austin, TX (US);
Oracle America, Inc., Redwood City, CA (US);
Abstract
Techniques for handling dependency conditions, including evil twin conditions, are disclosed herein. An instruction may designate a source register comprising two portions. The source register may be a double-precision register and its two portions may be single-precision portions, each specified as destinations by two other single-precision instructions. Execution of these two single-precision instructions, especially on a register renaming machine, may result in the appropriate values for the two portions of the source register being stored in different physical locations, which can complicate execution of an instruction stream. In response to detecting a potential dependency, one or more instructions may be inserted in an instruction stream to enable the appropriate values to be stored within one physical double precision register, eliminating an actual or potential evil twin dependency. Embodiments including a compiler that inserts instructions in a generated instruction stream to eliminate dependency conditions are also contemplated.