Selectively prohibiting speculative execution of conditional...

Details Selectively prohibiting speculative execution of conditional... Selectively prohibiting speculative execution of conditional...

2007-08-07

2007-08-07

Kim, Kenneth S. (Department: 2111)

Electrical computers and digital processing systems: processing

Processing architecture

Superscalar

C712S239000, C713S320000

Reexamination Certificate

active

11002522

ABSTRACT:
A method, apparatus, and computer program product are disclosed for selectively prohibiting speculative conditional branch execution. A particular type of conditional branch instruction is selected. An indication is stored within each instruction that is the particular type of conditional branch instruction. A processor then fetches a first instruction from code that is to be executed. A determination is made regarding whether the first instruction includes the indication. In response to determining that the instruction includes the indication: speculative execution of the first instruction is prohibited, an actual location to which the first instruction will branch is resolved, and execution of the code is branched to the actual location. In response to determining that the instruction does not include the indication, the first instruction is speculatively executed.

REFERENCES:
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patent: 6535905 (2003-03-01), Kalafatis et al.
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patent: 6766447 (2004-07-01), Jue et al.
patent: 2004/0181654 (2004-09-01), Chen
patent: 2005/0235170 (2005-10-01), Atkinson

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