Method and apparatus for controlling conditional branch executio

Details Method and apparatus for controlling conditional branch executio Method and apparatus for controlling conditional branch executio

1997-07-25

1999-09-14

Maung, Zarni

Electrical computers and digital processing systems: processing

Processing control

Branching

G06F 900

Patent

active

059516780

ABSTRACT:
A pipelined data processing system (10) includes a scheme for selectively controlling forward branch prediction and backward branch prediction, as well as prefetching and conditional execution of instructions for various branch scenarios. A three bit programmer accessible control field (19) is used to specify the type of activity to be used with a conditional branch instruction by allowing the independent control of prefetching of instructions for both forward and backward conditional branches. Also, control over conditional execution is provided for both forward and backward branches. By allowing independent control of forward and backward branch prediction and conditional execution, pipeline stalls can be reduced and more flexible program execution can be achieved for different environments.

REFERENCES:
patent: 5228131 (1993-07-01), Ueda et al.
patent: 5261063 (1993-11-01), Kohn et al.
patent: 5623615 (1997-04-01), Salem et al.
patent: 5701448 (1997-12-01), White
patent: 5734881 (1998-03-01), White et al.

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