Code determination using half-adder based operand comparator

Details Code determination using half-adder based operand comparator Code determination using half-adder based operand comparator

1983-08-24

1986-03-25

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 900, G06F 700

Patent

active

045787506

ABSTRACT:
Disclosed is a method and apparatus for predicting the condition code of a condition-code-setting instruction by comparing operands in a data processing system. An operand comparator includes one or more half-adders to predict carry outs at an early time. The comparator is used in a data processing system which is operative in response to instructions having operation codes for specifying operations to be executed. The instructions also have operand fields for identifying operands to be utilized in connection with executing the instructions.

REFERENCES:
patent: 3881173 (1975-04-01), Larsen et al.
patent: 4016545 (1977-04-01), Lipouski
patent: 4200927 (1980-04-01), Hughes et al.
patent: 4399507 (1983-08-01), Cosgrove et al.

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