A method and {HEAD ~ system} for determining the effectiveness of operation of {TAIL ~ a branch} of a branch unit in a processing system the processing system including at least one performance monitor counter and at least one monitor mode control register to configure the operations of the at least one of the PMC, includes accumulating count data during branch unit operation with the at least one during a predetermined sampling period, and determining effectiveness of branch prediction based on the accumulated count data 
A method and { HEAD ~ system } for determining the effectiveness of operation of { TAIL ~ a branch } of a branch unit in a processing system the processing system including at least one performance monitor counter and at least one monitor mode control register to configure the operations of the at least one of the PMC , includes accumulating count data during branch unit operation with the at least one during a predetermined sampling period , and determining effectiveness of branch prediction based on the accumulated count data
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