Shift amount floating-point calculating circuit with a small amo

Details Shift amount floating-point calculating circuit with a small amo Shift amount floating-point calculating circuit with a small amo

1991-09-06

1992-11-24

Malzahn, David H.

Boots, shoes, and leggings

36471508, G06F 501

Patent

active

051668980

ABSTRACT:
In a floating-point arithmetic unit for performing floating-point arithmetic of first and second input data which are represented by a floating-point representation and composed of first and second exponent parts and first and second mantissa parts, a shift amount calculating circuit comprises first and second substractors (26, 27) supplied with lower (n+1) bits of the first and the second exponent parts. The first subtracter subtracts a first lower number (#EA1) from a second lower number (#EB1) to produce a first difference signal (RS1). The second subtracter subtracts the second lower number (#EB1) from the first lower number (#EA1) to produce a second difference signal (RS1). Supplied with the first and the second exponent parts, an exponent comparing unit (28) compares the first exponent part with the second exponent part to produce a comparison result signal (CP1, CP2, CP3, CP4). Responsive to the comparison result signal, a first selector (31) selects one of the first difference signal and first and second value signals ("0", "64" ) as a first right-shift amount signal (SD1). Responsive to the comparison result signal, a second selector (32) selects one of the second difference signal and the first and the second value signals as a second right-shift amount signal (SD2).

REFERENCES:
patent: 4807172 (1989-02-01), Nukiyama
patent: 5010508 (1991-04-01), Sit et al.
patent: 5016209 (1991-05-01), Ikeda et al.
patent: 5021986 (1991-06-01), Nakamura
patent: 5027308 (1991-06-01), Sit et al.
patent: 5075882 (1991-12-01), Sakai et al.

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