公开(公告)号：US11567767B2

公开(公告)日：2023-01-31

申请号：US16944141

申请日：2020-07-30

Applicant: Marvell Asia Pte, Ltd. ,  Cray Inc.

Inventor： Harold Wade Cain, III ,  Rabin Andrew Sugumar ,  Nagesh Bangalore Lakshminarayana ,  Daniel Jonathan Ernst ,  Sanyam Mehta

IPC: G06F9/30 ,  G06F9/38

Abstract: A system for processing gather and scatter instructions can implement a front-end subsystem, a back-end subsystem, or both. The front-end subsystem includes a prediction unit configured to determine a predicted quantity of coalesced memory access operations required by an instruction. A decode unit converts the instruction into a plurality of access operations based on the predicted quantity, and transmits the plurality of access operations and an indication of the predicted quantity to an issue queue. The back-end subsystem includes a load-store unit that receives a plurality of access operations corresponding to an instruction, determines a subset of the plurality of access operations that can be coalesced, and forms a coalesced memory access operation from the subset. A queue stores multiple memory addresses for a given load-store entry to provide for execution of coalesced memory accesses.

公开(公告)号：US20190042435A1

公开(公告)日：2019-02-07

申请号：US15913749

申请日：2018-03-06

Applicant: Cray Inc.

Inventor： Sanyam Mehta ,  James Robert Kohn ,  Daniel Jonathan Ernst ,  Heidi Lynn Poxon ,  Luiz DeRose

IPC: G06F12/0862 ,  G06F12/1045

Abstract: A method for prefetching data into a cache is provided. The method allocates an outstanding request buffer (“ORB”). The method stores in an address field of the ORB an address and a number of blocks. The method issues prefetch requests for a degree number of blocks starting at the address. When a prefetch response is received for all the prefetch requests, the method adjusts the address of the next block to prefetch and adjusts the number of blocks remaining to be retrieved and then issues prefetch requests for a degree number of blocks starting at the adjusted address. The prefetching pauses when a maximum distance between the reads of the prefetched blocks and the last prefetched block is reached. When a read request for a prefetched block is received, the method resumes prefetching when a resume criterion is satisfied.

公开(公告)号：US20190163637A9

公开(公告)日：2019-05-30

申请号：US15913749

申请日：2018-03-06

Applicant: Cray Inc.

Inventor： Sanyam Mehta ,  James Robert Kohn ,  Daniel Jonathan Ernst ,  Heidi Lynn Poxon ,  Luiz DeRose

IPC: G06F12/0862 ,  G06F12/1045

Abstract: A method for prefetching data into a cache is provided. The method allocates an outstanding request buffer (“ORB”). The method stores in an address field of the ORB an address and a number of blocks. The method issues prefetch requests for a degree number of blocks starting at the address. When a prefetch response is received for all the prefetch requests, the method adjusts the address of the next block to prefetch and adjusts the number of blocks remaining to be retrieved and then issues prefetch requests for a degree number of blocks starting at the adjusted address. The prefetching pauses when a maximum distance between the reads of the prefetched blocks and the last prefetched block is reached. When a read request for a prefetched block is received, the method resumes prefetching when a resume criterion is satisfied.

公开(公告)号：US10303610B2

公开(公告)日：2019-05-28

申请号：US15913749

申请日：2018-03-06

Applicant: Cray Inc.

Inventor： Sanyam Mehta ,  James Robert Kohn ,  Daniel Jonathan Ernst ,  Heidi Lynn Poxon ,  Luiz DeRose

IPC: G06F12/00 ,  G06F12/0862 ,  G06F12/1045 ,  G06F12/0886

Abstract: A method for prefetching data into a cache is provided. The method allocates an outstanding request buffer (“ORB”). The method stores in an address field of the ORB an address and a number of blocks. The method issues prefetch requests for a degree number of blocks starting at the address. When a prefetch response is received for all the prefetch requests, the method adjusts the address of the next block to prefetch and adjusts the number of blocks remaining to be retrieved and then issues prefetch requests for a degree number of blocks starting at the adjusted address. The prefetching pauses when a maximum distance between the reads of the prefetched blocks and the last prefetched block is reached. When a read request for a prefetched block is received, the method resumes prefetching when a resume criterion is satisfied.

公开(公告)号：US09946654B2

公开(公告)日：2018-04-17

申请号：US15335041

申请日：2016-10-26

Applicant: Cray Inc.

Inventor： Sanyam Mehta ,  James Robert Kohn ,  Daniel Jonathan Ernst ,  Heidi Lynn Poxon ,  Luiz DeRose

IPC: G06F12/00 ,  G06F12/0862 ,  G06F12/1045

CPC classification number: G06F12/0862 ,  G06F12/1054 ,  G06F2212/602 ,  G06F2212/68

Abstract: A method for prefetching data into a cache is provided. The method allocates an outstanding request buffer (“ORB”). The method stores in an address field of the ORB an address and a number of blocks. The method issues prefetch requests for a degree number of blocks starting at the address. When a prefetch response is received for all the prefetch requests, the method adjusts the address of the next block to prefetch and adjusts the number of blocks remaining to be retrieved and then issues prefetch requests for a degree number of blocks starting at the adjusted address. The prefetching pauses when a maximum distance between the reads of the prefetched blocks and the last prefetched block is reached. When a read request for a prefetched block is received, the method resumes prefetching when a resume criterion is satisfied.

公开(公告)号：US20180074963A1

公开(公告)日：2018-03-15

申请号：US15335041

申请日：2016-10-26

Applicant: Cray Inc.

Inventor： Sanyam Mehta ,  James Robert Kohn ,  Daniel Jonathan Ernst ,  Heidi Lynn Poxon ,  Luiz DeRose

IPC: G06F12/0862 ,  G06F12/1045

CPC classification number: G06F12/0862 ,  G06F12/1054 ,  G06F2212/602 ,  G06F2212/68

Abstract: A method for prefetching data into a cache is provided. The method allocates an outstanding request buffer (“ORB”). The method stores in an address field of the ORB an address and a number of blocks. The method issues prefetch requests for a degree number of blocks starting at the address. When a prefetch response is received for all the prefetch requests, the method adjusts the address of the next block to prefetch and adjusts the number of blocks remaining to be retrieved and then issues prefetch requests for a degree number of blocks starting at the adjusted address. The prefetching pauses when a maximum distance between the reads of the prefetched blocks and the last prefetched block is reached. When a read request for a prefetched block is received, the method resumes prefetching when a resume criterion is satisfied.