Method and apparatus for implementing a speculative return stack

Details Method and apparatus for implementing a speculative return stack Method and apparatus for implementing a speculative return stack

1996-05-15

1999-10-12

Maung, Zarni

Electrical computers and digital processing systems: processing

Processing control

Branching

712237, 712239, 712230, 712243, G06F 942

Patent

active

059648686

ABSTRACT:
A return stack buffer mechanism that uses two separate return stack buffers is disclosed. The first return stack buffer is the Speculative Return Stack Buffer. The Speculative Return Stack Buffer is updated using speculatively fetched instructions. Thus, the Speculative Return Stack Buffer may become corrupted when incorrect instructions are fetched. The second return stack buffer is the Actual Return Stack Buffer. The Actual Return Stack Buffer is updated using information from fully executed branch instructions. When a branch misprediction causes a pipeline flush, the contents of the Actual Return Stack Buffer is copied into the Speculative Return Stack Buffer to correct any corrupted information.

REFERENCES:
patent: 5313634 (1994-05-01), Eickemeyer
patent: 5511172 (1996-04-01), Kimura et al.
patent: 5604877 (1997-02-01), Hoyt et al.
patent: 5623614 (1997-04-01), Van Dyke et al.

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