Method and means for tracking digit significance in arithmetic o

Details Method and means for tracking digit significance in arithmetic o Method and means for tracking digit significance in arithmetic o

1977-06-29

1978-08-29

Morrison, Malcolm A.

Boots, shoes, and leggings

G06F 750

Patent

active

041108310

ABSTRACT:
Method and means are described for the tracking of digit significance upon operands arithmetically combined in a series of binary operations such as addition, subtraction, or shifting in a decimal computer. The digits are decimally encoded in a format having enough excess capacity such that nonsignificant digits are unique. As part of the arithmetic combining of the operand, pairs of digits of like order but possibly mismatched as to significance and by observing a predetermined rounding rule may also cause a carry value to be propagated to a digit position of higher order. In subtraction by complement addition, an additional carry is propagated to a higher order position conditioned upon there being either a local overflow, a nonsignificant subtrahend, or a nonsignificant minuend and a subtrahend less than an amount specified by a rounding rule. Between the two operands, this results in the rounding of the more precise operand to the least significant digit position of the less precise operand. The method and means are applicable to floating point, sign plus magnitude, radix and diminished radix complement number representation forms.

REFERENCES:
patent: 3842250 (1974-10-01), Anderson
patent: 3885141 (1975-05-01), Kieburtz
Richards, R. K.; Arithmetic Operations in Digital Computers; Van Nostrand Company, Inc.; N.J. - 1961, pp. 174-176.

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