Apparatus for register bypassing in a microprocessor

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Other Related Categories

3642318, 3649371, 3642398, 364258, G06F 938

Type

Patent

Status

active

Patent number

056196687

Description

ABSTRACT:
A microprocessor having an architecture for pipelining instructions to reduce the time necessary to execute sequential instructions including an arithmetic and logic unit for processing information; a register file for storing data to be used by the arithmetic and logic unit, the register file including individual registers from which data is read for operations by the arithmetic and logic unit and to which data is written which results from operations of the arithmetic and logic unit; and apparatus for obtaining updated data from a source other than the register file when sequential instructions processed by the arithmetic and logic unit change data in a particular register in the register file during a first instruction and then use the data in the register file which was changed in a second instruction so that the data in the particular register is stale at the time it is required for the second instruction.

REFERENCES:
patent: 4003033 (1977-01-01), O'Keefe
patent: 4042972 (1977-08-01), Gruner
patent: 4112489 (1978-09-01), Wood
patent: 4382279 (1983-05-01), Ugon
patent: 4942525 (1990-07-01), Shintani et al.
patent: 5125083 (1992-06-01), Fite
patent: 5203002 (1993-04-01), Wetzel

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