Instruction to cancel outstanding cache prefetches
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United States of America Patent
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Feb 26, 2019
Grant Date -
Jul 6, 2017
app pub date -
Dec 22, 2016
filing date -
Jan 4, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques relate to handling outstanding cache miss prefetches. A processor pipeline recognizes that a prefetch canceling instruction is being executed. In response to recognizing that the prefetch canceling instruction is being executed, all outstanding prefetches are evaluated according to a criterion as set forth by the prefetch canceling instruction in order to select qualified prefetches. In response to evaluating, a cache subsystem is communicated with to cause canceling of the qualified prefetches that fit the criterion. In response to successful canceling of the qualified prefetches, a local cache is prevented from being updated from the qualified prefetches.
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