Method and apparatus for backing out of a software instruction a

Details Method and apparatus for backing out of a software instruction a Method and apparatus for backing out of a software instruction a

1987-05-19

1990-02-13

Zache, Raulfe B.

Boots, shoes, and leggings

364285, 3642851, 3642852, 3642853, G06F 1100, G06F 1700

Patent

active

049012223

ABSTRACT:
In a data processing system using a virtual memory addressing scheme, certain software instructions call for the virtual address to be stored in a base register. The virtual address stored in the base register is incremented or decremented during the read out cycle of the previous operand to address the next operand. If the operand is not in physical memory, then the contents of the base register is restored to its original value. This invention minimizes the amount of logic required to back out of a software instruction after execution has begun and is faster than checking if all resources are present before any state change is made during the execution of a software instruction.

REFERENCES:
patent: 4641305 (1987-02-01), Joyce et al.
patent: 4670835 (1987-06-01), Kelly et al.

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