Branch prediction storage for storing branch prediction informat

Details Branch prediction storage for storing branch prediction informat Branch prediction storage for storing branch prediction informat

1996-09-12

1998-10-13

Lall, Parshotam S.

395394, G06F 938

Patent

active

058225757

ABSTRACT:
A prediction storage for branch predictions and information corresponding to branch instructions which are outstanding within an instruction processing pipeline of a microprocessor. A branch tag is assigned to each branch instruction and the corresponding branch prediction and prediction information is stored into the prediction storage. The branch tag is routed through the instruction processing pipeline with the branch instruction. Branch prediction information corresponding to the instruction remains within the branch prediction storage apparatus, which may be integrated into a branch predictor or coupled nearby. The branch tag may be more easily routed through the pipeline since the branch tag may include fewer bits than the corresponding branch prediction information. The branch prediction information may be updated after correct or incorrect prediction by conveying an indication of the prediction or misprediction and the branch tag of the branch instruction to the branch prediction storage apparatus.

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