Patent
1994-07-01
1997-05-27
Harvey, Jack B.
395800, G06F 930, G06F 1516
Patent
active
056340230
ABSTRACT:
Methods for handling exceptions caused by speculatively scheduled instructions or predicated instructions executed within a computer program are described. The method for speculatively scheduled instructions includes checking at a commit point of a speculatively scheduled instruction, a semaphore associated with the speculatively scheduled instruction and branching to an error handling routine in the semaphore is set. A set semaphore indicates that an exception occurred when the speculatively scheduled instruction was executed. For a predicated instruction the method includes checking a predicate of a eliminated branch and a semaphore associated with the speculative instruction at a commit point of the speculative instruction and branching to an error handing routine if the semaphore indicates that an exception occurred when the speculative instruction was executed, and the predicate is true, which indicates that the speculative instruction was properly executed.
REFERENCES:
patent: 5421022 (1995-05-01), McKeen et al.
Adler Michael C.
Hobbs Steven O.
Lowney Paul G.
Digital Equipment Corporation
Drozenski Diane C.
Fisher Arthur W.
Harvey Jack B.
Maloney Denis G.
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