Method and apparatus for manipulating a carry/borrow bit to nume

Details Method and apparatus for manipulating a carry/borrow bit to nume Method and apparatus for manipulating a carry/borrow bit to nume

1997-04-07

1998-12-29

Ellis, Richard L.

G06F 9302

Patent

active

058549200

ABSTRACT:
Method and apparatus for adjusting the range of a data processor instruction field for a data processor (10). The present invention allows the range of a data processor instruction field to be adjusted without requiring decode of the instruction field and without requiring the instruction field value to be modified. In one embodiment, a data processor (10) uses the value of the carry-in/borrow bit (60) provided to an arithmetic unit (30) to selectively adjust the range of the immediate data operand for certain instructions, such as, for example, add immediate (ADDI) and subtract immediate (SUBI).

REFERENCES:
patent: 3909789 (1975-09-01), Holtey et al.
patent: 4377846 (1983-03-01), Yoshida
Motorola,MC68030 Enhanced 32-bit Microprocessor User's Manual, second edition, 1989, pp. 3-20 through 3-23 and 3-178 through 3-181.

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