Recovering a subordinate strand from a branch misprediction...

Details Recovering a subordinate strand from a branch misprediction... Recovering a subordinate strand from a branch misprediction...

2008-08-25

2010-02-16

Kim, Kenneth S (Department: 2111)

Electrical computers and digital processing systems: processing

Processing control

Branching

C712S207000, C712S240000

Reexamination Certificate

active

07664942

ABSTRACT:
Embodiments of the present invention provide a system that executes program code in a processor. The system starts by executing the program code in a normal mode using a primary strand while concurrently executing the program code ahead of the primary strand using a subordinate strand in a scout mode. Upon resolving a branch using the subordinate strand, the system records a resolution for the branch in a speculative branch resolution table. Upon subsequently encountering the branch using the primary strand, the system uses the recorded resolution from the speculative branch resolution table to predict a resolution for the branch for the primary strand. Upon determining that the resolution of the branch was mispredicted for the primary strand, the system determines that the subordinate strand mispredicted the branch. The system then recovers the subordinate strand to the branch and restarts the subordinate strand executing the program code.

REFERENCES:
patent: 7114059 (2006-09-01), Wilkerson
patent: 7343602 (2008-03-01), Luk et al.
patent: 7490229 (2009-02-01), Tremblay et al.
patent: 2001/0037447 (2001-11-01), Mukherjee et al.
patent: 2004/0128448 (2004-07-01), Stark et al.
patent: 2006/0168432 (2006-07-01), Caprioli et al.

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