Apparatus for enforcing true dependencies in an out-of-order pro

Details Apparatus for enforcing true dependencies in an out-of-order pro Apparatus for enforcing true dependencies in an out-of-order pro

1997-06-25

1999-04-27

Ellis, Richard L.

G06F 938

Patent

active

058988530

ABSTRACT:
In a processor executing instructions speculatively or out-of-order, a dependency table tracks instruction dependencies between a current instruction and a live instruction. The table contains an instruction identifier and the destination register specified by the live instruction. The table can also contain information about the age of the entry, the validity of the entry, and the process which the entry is associated. A dependency between instructions is determined by one or more comparators comparing the destination register to the source registers of the current instruction. True dependencies are distinguished from false dependencies using the age information, the validity information, and the process information.

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