Data processor

Details Data processor Data processor

1999-07-23

2000-11-21

Eng, David Y.

Electrical computers and digital processing systems: processing

Processing control

Branching

G06F 940

Patent

active

061516732

ABSTRACT:
A data processor in accordance with the present invention makes it possible to perform pre-branch processing with respect to a return address in the initial stage of pipeline processing also on a subroutine return instruction, and therefore by providing a stack memory (PC stack) dedicated to a program counter (PC) for storing only return addresses of the subroutine return instruction, in executing a subroutine call instruction in an execution stage of a pipeline processing mechanism, the return address from the subroutine is pushed to the PC stack, and the pre-branch processing is performed to the address popped from the PC stack in decoding the subroutine return instruction in an instruction decoding stage.

REFERENCES:
patent: 3794980 (1974-02-01), Cogar et al.
patent: 4317171 (1982-02-01), Maejima et al.
patent: 4401373 (1983-08-01), Nakai
patent: 4425628 (1984-01-01), Bedard et al.
patent: 4484261 (1984-11-01), Brantingham
patent: 4603384 (1986-07-01), Brantingham
patent: 5179673 (1993-01-01), Steely, Jr. et al.

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