Patent
1995-10-30
1997-06-03
Treat, William M.
395726, 395825, G06F 1300
Patent
active
056363664
ABSTRACT:
A system or method is provided for translating a first program code to a second program code and for executing the second program code while preserving instruction state-atomicity of the first code. The first program code is executable on a computer having a first architecture adapted to a first instruction set and the second program code is executable on a computer having a memory and register state and a second architecture adapted to a second instruction set that is reduced relative to the first instruction set.
A first computer translates the first code instructions to corresponding second code instructions in accordance with a pattern code that defines first code instructions in terms of second code instructions. The second code instructions for each first code instruction organized in a granular instruction sequence having in order at least two groups, a first group having a first subgroup including second code read instructions and a second subgroup including modify instructions and a second group having a third subgroup including state update instructions subject to exception, including any special write instruction required to implement the first code instruction being translated, and a fourth subgroup including state update instructions free of exception.
REFERENCES:
patent: 4674038 (1987-06-01), Brelsford et al.
patent: 5193167 (1993-03-01), Sites et al.
patent: 5218712 (1993-06-01), Cutler et al.
Robinson Scott G.
Sites Richard L.
Witek Richard T.
Dagg David A.
Digital Equipment Corporation
Fisher Arthur W.
Maloney Denis G.
Treat William M.
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