Qualcomm Incorporated

Vimal K Reddy

James Norris Dieffenderfer

Michael Scott McIlvaine

Brian Stempel

Michael W Morrow

Daren Eugene Streett

Mike W Morrow

Establishing a branch target instruction cache (BTIC) entry for subroutine returns to reduce pipeline bubbles, and related systems, methods, and computer-readable media are disclosed. In one embodiment, a method of establishing a BTIC entry includes detecting a subroutine call in an execution pipeline. In response, at least one instruction fetched sequential to the subroutine call is written as a branch target instruction in a BTIC entry for a subroutine return. A next instruction fetch address is calculated, and is written into a next instruction fetch address field in the BTIC entry. In this manner, the BTIC may provide correct branch target instruction and next instruction fetch address data for the subroutine return, even if the subroutine return is encountered for the first time or the subroutine is called from different calling locations.

Establishing a branch target instruction cache (BTIC) entry for subroutine returns to reduce execution pipeline bubbles, and related systems, methods, and computer-readable media

Filters and methods for managing presence counter saturation are disclosed. The filters can be coupled to a collection of items and maintain information for determining a potential presence of an identified item in the collection of items. The filter includes a filter controller and one or more mapping functions. Each mapping function has a plurality of counters associated with the respective mapping function. When a membership status of an item in the collection of items changes, the filter receives a membership change notification including an identifier identifying the item. Each mapping function processes the identifier to identify a particular counter associated with the respective mapping function. If a particular counter has reached a predetermined value, a request including a reference to the particular counter is sent to the collection of items. The filter receives a response to the request and modifies the particular counter as a result of the response.

Managing counter saturation in a filter

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Raleigh, NC, United States of America

Vimal K Reddy