公开(公告)号：US20230342154A1

公开(公告)日：2023-10-26

申请号：US17724600

申请日：2022-04-20

Applicant: Arm Limited

Inventor： Luca MARONCELLI ,  Harvin IRIAWAN ,  Peter Raphael EID ,  Cédric Denis Robert AIRAUD

IPC: G06F9/38

CPC classification number: G06F9/3802 ,  G06F9/3851

Abstract: Aspects of the present disclosure relate to an apparatus comprising processing circuitry, prefetch circuitry and prefetch metadata storage comprising a plurality of entries. Metadata items, each associated with a given stream of instructions, are stored in the prefetch metadata storage. Responsive to a given entry of the plurality of entries being associated with the given stream associated with a given metadata item, the given entry is updated. Responsive to no entry of the plurality of entries being associated with the given stream associated with a given metadata item, an entry is selected according to a default replacement policy, the given stream is allocated thereto, and the selected entry is updated based on the given metadata item. Responsive to a switch condition being met, the default selection policy is switched to an alternative selection policy comprising locking one or more entries by preventing allocation of streams to the locked entries.