公开(公告)号：US11550723B2

公开(公告)日：2023-01-10

申请号：US16113185

申请日：2018-08-27

Applicant: QUALCOMM Incorporated

Inventor： Niket Choudhary ,  David Scott Ray ,  Thomas Philip Speier ,  Eric Robinson ,  Harold Wade Cain, III ,  Nikhil Narendradev Sharma ,  Joseph Gerald McDonald ,  Brian Michael Stempel ,  Garrett Michael Drapala

IPC: G06F12/0862 ,  G06F12/0811

Abstract: An apparatus, method, and system for memory bandwidth aware data prefetching is presented. The method may comprise monitoring a number of request responses received in an interval at a current prefetch request generation rate, comparing the number of request responses received in the interval to at least a first threshold, and adjusting the current prefetch request generation rate to an updated prefetch request generation rate by selecting the updated prefetch request generation rate from a plurality of prefetch request generation rates, based on the comparison. The request responses may be NACK or RETRY responses. The method may further comprise either retaining a current prefetch request generation rate or selecting a maximum prefetch request generation rate as the updated prefetch request generation rate in response to an indication that prefetching is accurate.

公开(公告)号：US20190294443A1

公开(公告)日：2019-09-26

申请号：US15926429

申请日：2018-03-20

Applicant: QUALCOMM Incorporated

Inventor： Sandeep Suresh Navada ,  Michael Scott McIlvaine ,  Rodney Wayne Smith ,  Robert Douglas Clancy ,  Yusuf Cagatay Tekmen ,  Niket Choudhary ,  Daren Eugene Streett ,  Richard Doing ,  Ankita Upreti

IPC: G06F9/38

Abstract: Providing early pipeline optimization of conditional instructions in processor-based systems is disclosed. In one aspect, an instruction pipeline of a processor-based system detects a mispredicted branch (i.e., following a misprediction of a condition associated with a speculatively executed conditional branch instruction), and records a current state of one or more condition flags as a condition flags snapshot. After a pipeline flush is initiated and a corrected fetch path is restarted, an instruction decode stage of the instruction pipeline uses the condition flags snapshot to apply optimizations to conditional instructions detected within the corrected fetch path. According to some aspects, the condition flags snapshot is subsequently invalidated upon encountering a condition-flag-writing instruction within the corrected fetch path. In this manner, the condition flags snapshot enables non-speculative (with respect to the corrected fetch path) resolution of conditional instructions earlier within the instruction pipeline, thus conserving system resources and improving processor performance.

公开(公告)号：US11061822B2

公开(公告)日：2021-07-13

申请号：US16113141

申请日：2018-08-27

Applicant: QUALCOMM Incorporated

Inventor： Pritha Ghoshal ,  Niket Choudhary ,  Ravi Rajagopalan ,  Patrick Eibl ,  Brian Stempel ,  David Scott Ray ,  Thomas Philip Speier

IPC: G06F12/00 ,  G06F13/00 ,  G06F13/28 ,  G06F12/1027

Abstract: A method, apparatus, and system for reducing pipeline stalls due to address translation misses is presented. An apparatus comprises a memory access instruction pipeline, a translation lookaside buffer coupled to the memory access instruction pipeline, and a TLB miss queue coupled to both the TLB and the memory access instruction pipeline. The TLB miss queue is configured to selectively store a first memory access instruction that has been removed from the memory access instruction pipeline as a result of the first memory access instruction missing in the TLB along with information associated with the first memory access instruction. The TLB miss queue is further configured to reintroduce the first memory access instruction to the memory access instruction pipeline associated with a return of an address translation related to the first memory access instruction.