Method and system for dynamically recovering a register-address-

Details Method and system for dynamically recovering a register-address- Method and system for dynamically recovering a register-address-

1996-03-25

1998-08-11

Ellis, Richard L.

395393, G06F 930

Patent

active

057940240

ABSTRACT:
A method and system for dynamically recovering a lookahead register-address-table (RAT) in a processor that executes program instructions. Each instruction that updates a logical register address is assigned to a different physical register address. Each of the instructions to be processed by the processor are stored in a fifo queue. The physical register address assignments for each of the instructions are stored in a first RAT, and information regarding instructions that have completed execution by the processor are stored in a second RAT. The method and system further comprises storing the physical register address assignments for non-branch instructions from the fifo queue in a recovery RAT. The first RAT is then restored after an interrupt occurs by copying the second RAT into the recovery RAT and then copying the recovery RAT into the first RAT. The first RAT is restored after a mispredicted branch instruction has been executed by copying the recovery RAT into the first RAT, whereby the first RAT is restored without storing multiple snapshots.

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IBM Technical Disclosure Bulletin, Conditional Execution in a Register Management Scheme for Out of Sequence Execution vol. 34 No. 10A, Mar. 1992; pp. 449-454.

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