05146570 is referenced by 20 patents and cites 3 patents.

A method and apparatus are described for expanding the capability of an instruction prefetch buffer. The method and apparatus enables the instruction prefetch buffer to distinguish between old prefetches that occurred before a branch in an instruction stream and new prefetches which occurred after the branch in the instruction stream. A control tag is generated each time a request for an instruction is sent to a storage. The returning instruction has appended thereto the original control tag which is then compared to the current value of control tag in the instruction prefetch buffer. If the two values match, then this is an indication that a branch has not occurred and the instruction is still required. However, if the two values of the control tag are not equal, then this is an indication that a branch in the instruction stream has occurred and that the instruction being sent from storage to the buffer is no longer required. The method and apparatus are also applicable to the use of branch-with-execute instructions wherein a subject instruction is executed immediately following the branch-with-execute instruction. The execution of this subject instruction before the branch target instruction enables the system processor to continue operating while it is waiting for the branch target instruction.

Title
System executing branch-with-execute instruction resulting in next successive instruction being execute while specified target instruction is prefetched for following execution
Application Number
666790
Publication Number
5146570
Application Date
July 3, 1990
Publication Date
September 8, 1992
Inventor
William M Johnson
Leander
TX, US
Phillip D Hester
Austin
TX, US
Agent
Thomas E Tyson
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 12/02
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