Electrical computers and digital processing systems: processing – Processing control – Mode switch or change
Reexamination Certificate
2005-02-11
2009-10-13
Chan, Eddie P (Department: 2183)
Electrical computers and digital processing systems: processing
Processing control
Mode switch or change
C712S220000
Reexamination Certificate
active
07603543
ABSTRACT:
A method, system, and computer program product for enhancing performance of an in-order microprocessor with long stalls. In particular, the mechanism of the present invention provides a data structure for storing data within the processor. The mechanism of the present invention comprises a data structure including information used by the processor. The data structure includes a group of bits to keep track of which instructions preceded a rejected instruction and therefore will be allowed to complete and which instructions follow the rejected instruction. The group of bits comprises a bit indicating whether a reject was a fast or slow reject; and a bit for each cycle that represents a state of an instruction passing through a pipeline. The processor speculatively continues to execute a set bit's corresponding instruction during stalled periods in order to generate addresses that will be needed when the stall period ends and normal dispatch resumes.
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Dooley Miles Robert
Frommer Scott Bruce
Le Hung Qui
Levenstein Sheldon B.
Saporito Anthony
Chan Eddie P
Gerhardt Diana R.
International Business Machines - Corporation
Vicary Keith
Yee & Associates P.C.
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