公开(公告)号：US11740906B2

公开(公告)日：2023-08-29

申请号：US17677413

申请日：2022-02-22

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Maziar Goudarzi ,  Zhizhao Qian ,  Reza Azimi ,  Billy Mengxuan Cai ,  Man Pok Ho

IPC: G06F9/38 ,  G06F8/41 ,  G06F9/30 ,  G06F9/32 ,  G06F12/0862

CPC classification number: G06F9/3814 ,  G06F8/4452 ,  G06F9/30047 ,  G06F9/325 ,  G06F12/0862

Abstract: A method and hardware system to remove the overhead caused by having stream handling instructions in nested loops. Where code contains inner loops, nested in outer loops, a compiler pass identifies qualified nested streams and generates ISA specific instructions for transferring stream information linking an inner loop stream with an outer loop stream, to hardware components of a co-designed prefetcher. The hardware components include a frontend able to decode and execute instructions for a stream linking information transfer mechanism, a stream engine unit with a streams configuration table (SCT) having a field for allowing a subordinate stream to stay pending for values from its master stream, and a stream prefetch manager with buffers for storing values of current elements of a master stream, and with a nested streams control unit for reconfiguring and iterating the streams.