公开(公告)号：US20190087192A1

公开(公告)日：2019-03-21

申请号：US15712119

申请日：2017-09-21

Applicant: QUALCOMM Incorporated

Inventor： Shivam PRIYADARSHI ,  Rami Mohammad A. AL SHEIKH ,  Brandon DWIEL ,  Derek HOWER

IPC: G06F9/38

CPC classification number: G06F9/3802 ,  G06F9/30043 ,  G06F9/325 ,  G06F9/3808 ,  G06F9/383 ,  G06F9/3832 ,  G06F9/3838 ,  G06F9/3867

Abstract: Systems and methods for constructing an instruction slice for prefetching data of a data-dependent load instruction include a slicer for identifying a load instruction in an instruction sequence as a first occurrence of a qualified load instruction which will miss in a last-level cache. A commit buffer stores information pertaining to the first occurrence of the qualified load instruction and shadow instructions which follow. For a second occurrence of the qualified load instruction, an instruction slice is constructed from the information in the commit buffer to form a slice payload. A pre-execution engine pre-executes the instruction slice based on the slice payload to determine an address from which data is to be fetched for execution of a third and any subsequent occurrences of the qualified load instruction. The data is prefetched from the determined address for the third and any subsequent occurrence of the qualified load instruction.

公开(公告)号：US20190065384A1

公开(公告)日：2019-02-28

申请号：US15683350

申请日：2017-08-22

Applicant: QUALCOMM Incorporated

Inventor： Rami Mohammad AL SHEIKH ,  Shivam PRIYADARSHI ,  Brandon DWIEL ,  David John PALFRAMAN ,  Derek HOWER

IPC: G06F12/0875 ,  G06F12/084 ,  G06F12/0811

Abstract: A request to access data at a first physical address misses in a private cache of a processor. A confidence value is received for the first physical address based on a hash value of the first physical address. A determination is made that the received confidence value exceeds a threshold value. In response, a speculative read request specifying the first physical address is issued to a memory controller of a main memory to expedite a miss for the data at the first physical address in a shared cache.

公开(公告)号：US20190065375A1

公开(公告)日：2019-02-28

申请号：US15683391

申请日：2017-08-22

Applicant: QUALCOMM Incorporated

Inventor： Rami Mohammad AL SHEIKH ,  Shivam PRIYADARSHI ,  Brandon DWIEL ,  David John PALFRAMAN ,  Derek HOWER ,  Muntaquim Faruk CHOWDHURY

IPC: G06F12/0862 ,  G06F12/0875 ,  G06F12/109 ,  G06F12/1045

Abstract: A first load instruction specifying a first virtual address misses in a data cache. A delta value is received based on a program counter value of the first load instruction. A second virtual address is computed based on the delta value and the first virtual address. Data associated with the second virtual address is then prefetched from a main memory to the data cache prior to a second load instruction specifying the second virtual address missing in the data cache.