Predicting for all branch instructions in a bunch based on histo

Details Predicting for all branch instructions in a bunch based on histo Predicting for all branch instructions in a bunch based on histo

1999-01-19

2000-04-25

Kim, Kenneth S.

Electrical computers and digital processing systems: processing

Processing control

Branching

712240, 712215, G06F 938

Patent

active

060556293

ABSTRACT:
A method for a prediction correlation between a first group of branch instructions in a bunch of instructions and a second group of branch instructions in a bunch of instructions is disclosed. The method includes indicating a direction of a plurality of branch instructions in a bunch of instructions. More particularly, the method includes building an address composed of an instruction fetch address and bits in a history register. The method accesses a bunch of instructions using the fetch address and accesses a prediction bits set from a branch history table using the composed address. The accessed bunch of instructions are processed. Further, the history register and the branch history table are updated to correlate a first group of a branch instructions in the accessed bunch of instructions to a second group of branch instructions in a next group of branch instructions in the bunch of instructions.

REFERENCES:
patent: 5553253 (1996-09-01), Pan et al.
patent: 5687360 (1997-11-01), Chang
patent: 5758143 (1998-05-01), Levitan
patent: 5794063 (1998-08-01), Favor
patent: 5805878 (1998-09-01), Rahman et al.
patent: 5815699 (1998-09-01), Puziol et al.
patent: 5875325 (1999-02-01), Talcott

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