Performing arithmetic on composite operands to obtain a binary o

Details Performing arithmetic on composite operands to obtain a binary o Performing arithmetic on composite operands to obtain a binary o

1992-12-18

1994-12-20

Malzahn, David H.

Boots, shoes, and leggings

G06F 700

Patent

active

053750802

ABSTRACT:
Binary outcome operations are performed on composite operands. A composite operand is an operand that includes plural multi-bit component data items. A binary outcome operation obtains, for each component, a flag bit that depends on the numerical value of the component. A binary outcome operation can be performed by performing an arithmetic operation in parallel on a composite operand in which each component includes more than one bit. The arithmetic operation can add a value, producing a carry signal if a component and the added value together exceed a maximum possible value. Or the arithmetic operation can subtract a value, producing a borrow signal if a component is less than the subtracted value. Also, if the arithmetic operation subtracts a value that is equal to the component, the resulting data item includes only zeros; an operation in parallel can then obtain a single flag bit that is a zero only if the resulting data item includes only zeros. The binary outcome operation can compare each component with a value or can determine whether each component is within a range.

REFERENCES:
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patent: 4742552 (1988-05-01), Andrews
patent: 4789957 (1988-12-01), Niehaus et al.
patent: 4811266 (1989-03-01), Woods et al.
patent: 5038313 (1991-08-01), Kojima
patent: 5129092 (1992-07-01), Wilson
patent: 5280547 (1994-01-01), Mahoney

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