Method and apparatus for determining floating point data class

Details Method and apparatus for determining floating point data class Method and apparatus for determining floating point data class

1995-03-31

1998-10-20

Elmore, Reba I.

Boots, shoes, and leggings

36471503, 341 50, 341 94, G06F 738, G06F 700, G06F 1500, H03M 700

Patent

active

058256784

ABSTRACT:
A new Test FP Data Class operation is provided which utilizes a 12-bit mask to determine to which of the 12 possible data classes a floating point number belongs and sets a condition code accordingly. As preferably embodied, a typical IBM System 390 instruction format is adapted to implement a Test FP Data Class operation. The class and sign of the first operand are examined to select one bit from the second-operand address. A condition code of 0 or 1 is set according to whether the selected bit is 0 or 1. The second-operand address is not used to address data; instead, individual bits of the address are used to specify the applicable combinations of operand calls and sign.

REFERENCES:
patent: 4325120 (1982-04-01), Colley et al.
patent: 4707783 (1987-11-01), Lee et al.
patent: 4831575 (1989-05-01), Kuroda
patent: 5191335 (1993-03-01), Leitherer

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