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:
Aug. 20, 2013
Filed:
Dec. 04, 2009
Peter Carl Damron, Fremont, CA (US);
Peter Carl Damron, Fremont, CA (US);
Oracle America, Inc., Redwood City, PA (US);
Abstract
The present disclosure provides a compiler prespill phase that reduces or eliminates excessive register pressure, or locations in the code of a program where live virtual registers exceeds physical registers of a target computing device, prior to register allocation. The prespill phase identifies points of excessive register pressure, selects candidate virtual registers, chooses virtual registers to prespill from the candidates, and inserts spill and reload instructions to prespill the chosen registers. The prespill phase may reduce the register pressure such that the live virtual registers only exceed the physical registers by a particular number, the live virtual registers equal the physical registers, or the physical registers exceed the live virtual registers by a particular number. The compiler may then perform one or more early and/or late instruction scheduling phases, including global and/or local instruction scheduling, to optimize the placement of the spill and reload instructions.