Method and system for using dynamic, deferred operation...

Details Method and system for using dynamic, deferred operation... Method and system for using dynamic, deferred operation...

2005-08-16

2005-08-16

Treat, William M. (Department: 2183)

Electrical computers and digital processing systems: processing

Dynamic instruction dependency checking, monitoring or...

C712S225000

Reexamination Certificate

active

06931515

ABSTRACT:
A method and system for determining, at run-time, whether or not to defer an exception that arises during execution of a control-speculative load instruction based on a recent history of execution of that control-speculative load instruction. The method and system relies on recent execution history stored in a speculative-load-accelerated-deferral table. If an exception arises during execution of a control-speculative load instruction, then the speculative-load-accelerated-deferral table is searched for an entry corresponding to the control-speculative load instruction. If an entry is found, then the exception is deferred, since the speculative-load-accelerated-deferral table indicates that a recent exception arising from execution of the control-speculative load instruction was not recovered via a chk.s-mediated branch to a recovery block, and not otherwise used by a non-speculative instruction. By contrast, if no entry corresponding to the control-speculative load instruction is found in the speculative-load-accelerated-deferral table, then the exception is immediately handled.

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patent: 2294341 (1996-04-01), None

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