Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2007-01-23
2007-01-23
Malzahn, D. H. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
10436392
ABSTRACT:
A method for decimal multiplication in a superscaler processor comprising: obtaining a first operand and a second operand; establishing a multiplier and an effective multiplicand from the first operand and the second operand; and generating and accumulating a partial product term every two cycles. The partial product terms are created from the effective multiplicand and multiples of the multiplier, where the effective multiplicand is stored in a first register file, the multiples being ones times the effective multiplier, two times the effective multiplier, four times the effective multiplier and eight times the effective multiplier and the partial product terms are added to an accumulation of previous partial product terms shifted one digit right such that a digit shifted off is preserved as a result digit.
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Busaba Fadi Y.
Carlough Steven R.
Krygowski Christopher A.
Rell, Jr. John G.
Cantor & Colburn LLP
International Business Machines - Corporation
Malzahn D. H.
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