Apparatus and method for performing a shift operation in a multi

Details Apparatus and method for performing a shift operation in a multi Apparatus and method for performing a shift operation in a multi

1987-05-15

1989-12-12

Harkcom, Gary V.

Boots, shoes, and leggings

36471508, G06F 738, G06F 752

Patent

active

048872326

ABSTRACT:
In floating point operations, it is necessary to align the fractions of the floating point operands before addition or subtraction operations can be executed. This fraction alignment is performed by a shifting operation, typically using dedicated apparatus such as a barrel shifter. While the dedicated apparatus provides high performance in the execution of the shifting operation, this performance is accomplished by reserving a portion of the substrate area for apparatus implementation. To avoid the use of dedicated apparatus, the shifting operation is performed in a multiplier unit, according to the present invention, by entering the number to be shifted in the multiplicand register of the multiplier unit while entering appropriate control signals in the multiplier register. In this manner, a shifting operation can be performed without dedicated apparatus and with minor impact on performance.

REFERENCES:
patent: 4229800 (1980-10-01), Gregorian et al.
patent: 4546446 (1985-10-01), Machida
patent: 4718031 (1988-01-01), Nukiyama
patent: 4748584 (1988-05-01), Noda
patent: 4752905 (1988-06-01), Nakagawa et al.
Mead et al., "Introduction to VLSI Systems", Addison-Wesley Publishing Company, 1980, pp. 145-180.

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