Subroutine return prediction mechanism

Details Subroutine return prediction mechanism Subroutine return prediction mechanism

G - Physics

06

F

354/230.8

G06F 9/42 (2006.01) G06F 9/32 (2006.01) G06F 9/38 (2006.01)

Patent

CA 2032320

ABSTRACT OF THE DISCLOSURE A method and arrangement for producing a predicted subroutine return address in response to entry of a subroutine return instruction in a computer pipeline that has a ring pointer counter and a ring buffer coupled to the ring pointer counter. The ring pointer counter contains a ring pointer that is changed when either a subroutine call instruction or return instruction enters the computer pipeline. The ring buffer has buffer locations which store a value present at its input into the buffer location pointed to by the ring pointer when a subroutine call instruction enters the pipeline. The ring buffer provides a value from the buffer location pointed to by the ring pointer when a subroutine return instruction enters the computer pipeline, this provided value being the predicted subroutine return address.

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