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公开(公告)号：GB2454816A
公开(公告)日：2009-05-20
申请号：GB0822115
申请日：2008-12-04
Applicant: IBM
Inventor： TRONG SON DAO , HAESS JUERGEN , HUTTON DAVID SHANE , KLEIN MICHAEL , RELL JOHN GILBERT JR , SCHWARZ ERIC MARK , SHUM KEVIN CHUNG-LUNG
Abstract: Disclosed is a method and system for operating the execution unit of a computer, the execution unit having a pipeline-based execution flow during which load instructions are processed. The load instructions having the function of loading data from a storage means into a predetermined location within the pipeline, preferably a register-implemented pipeline. The method has the steps of, when a load instruction occurs in the pipeline, reading (610) the current value of the target location, and buffering (620) the current target value at a predetermined location within said pipeline. Next, the value of the source location is loaded (610) and stored (620) at the target location, the pipeline is executed according to its execution flow, using the loaded value for computing purposes. If an event (630) indicating that the loaded value is not correct occurs, (660) the buffered original value may be used instead of the loaded value. The execution unit may be a floating point unit with the reading and/or loading of the data being done using a multiply-add data path.
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公开(公告)号：GB2454816B
公开(公告)日：2012-02-22
申请号：GB0822115
申请日：2008-12-04
Applicant: IBM
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