Method of checking the execution of microcode sequences

Details Method of checking the execution of microcode sequences Method of checking the execution of microcode sequences

1985-06-28

1990-04-24

Fleming, Michael R.

Excavating

371 161, 364200, G06F 1100

Patent

active

049205382

ABSTRACT:
A global label (path identifier) is stored at compile time which computes a check marker along one permissible execution path of execution of a microinstruction sequence. The remaining execution paths are embedded with scalars and skip microinstructions so that execution along any conditional branch path will always yield the same global label (path identifier). Microcode sequence errors are determined at the completion of each microprogram node execution by comparing a path identifier generated at runtime with the global label stored earlier.

REFERENCES:
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patent: 4410938 (1983-10-01), Higashiyama
patent: 4430706 (1984-02-01), Sand
patent: 4730315 (1988-03-01), Saito
Shih, 26 IBM Tech. Discl. Bul. 2519, Oct. 1983, "Wild Branch Avoidance During Microcode Execution".

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