Boots – shoes – and leggings
Patent
1991-11-19
1992-08-04
Mai, Tan V.
Boots, shoes, and leggings
G06F 752
Patent
active
051365375
ABSTRACT:
A method and apparatus for determining the product of a first number and a second number are disclosed. The preferred embodiment of the method includes the steps of: (1) determining a plurality of respective partial products for each pair-combination of the first number's digits and the second number's digits; (2) providing a register having a plurality of register cells, each having a hierarchical significance; (3) accumulating selected of the respective partial products to produce accumulated values in specified of the register cells according to the following relationships: P.sub.m,n --[accumulates in].fwdarw.r.sub.x ; x=(m+n)-1, where "P.sub.m,n " represents the respective partial product; "m" represents the first number's significance (m=1, 2, . . . ); "n" represents the second number's significance (n=1,2, . . . ); and "r.sub.x " represents a specified register cell having significance "x"; (4) sequentially effecting a shifting accumulation operation comprising shifting specific digits of the accumulated value stored in a lesser-significant register cell to the next-higher-significant register cell containing an accumulated value, and adding the specific digits to the accumulated value stored in the next-higher-significant register celll as least-significant digits between significance-adjacent register cells from the least-significant register cell to the most-significant register cell; and (5) shifting the contents of the register cells from the register cells.
REFERENCES:
patent: 4573136 (1986-02-01), Rossiter
patent: 4809212 (1989-02-01), New et al.
Swithers et al., "Fast Multiply", IBM Tech. Discl. Bull. vol. 8 No. 11, Apr. 1966, p. 1492.
Larson, "Dual-Speed Multiply Unit", IBM Tech. Discl. Bull. vol. 16, No. 7 Dec. 1973, pp. 2199-2201.
Asghar Safdar M.
Mondul Donald D.
Advanced Micro Devices , Inc.
Mai Tan V.
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