Method to detect a stalled instruction stream and serialize...

Details Method to detect a stalled instruction stream and serialize... Method to detect a stalled instruction stream and serialize...

2006-03-31

2008-08-12

Chan, Eddie (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Reexamination Certificate

active

07412589

ABSTRACT:
A computer implemented method, apparatus, and computer usable program code for ensuring forward progress of instructions in a pipeline of a processor. Instructions are received in the pipeline. Instruction flushes are counted in the pipeline to determine a flush count. A single step mode in the pipeline is entered in response to the flush count exceeding a threshold. The single step mode instructions are issued in serial such that an instruction is not issued for execution until a prior instruction has completed execution.

REFERENCES:
patent: 5896523 (1999-04-01), Bissett et al.
patent: 6550002 (2003-04-01), Davidson et al.

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