Circuit for executing conditional branch instructions in pipelin

Details Circuit for executing conditional branch instructions in pipelin Circuit for executing conditional branch instructions in pipelin

1992-01-31

1995-04-18

Eng, David Y.

Boots, shoes, and leggings

3642318, 36494834, G06F 938

Patent

active

054086205

ABSTRACT:
A circuit for executing conditional branch instructions in a pipeline process comprises registers for retaining condition codes settled set or determined at different stages, respectively, registers for retaining pipeline tags identifying instructions at the respective stages and indicating the stage where the condition codes are settled or set by the instructions, and a branch controller for deciding whether the settlement of condition codes for conditional branch instructions existing at the respective stage has occured responsive to the tags in a plurality of stages, and for selecting the settled condition codes from among the condition codes stored in the registers and indicating whether a branch should be performed.

REFERENCES:
patent: 3875391 (1975-04-01), Shapiro
patent: 4025771 (1977-05-01), Lynch
patent: 4112489 (1978-09-01), Wood
patent: 4187539 (1980-02-01), Eaton
patent: 4777594 (1988-10-01), Jones
Abstract of Japan, Application No. JP820040004, Application Date Dec. 3, 1982.

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