Method and apparatus for performing a double precision operation

Details Method and apparatus for performing a double precision operation Method and apparatus for performing a double precision operation

1997-09-10

1999-07-06

Ngo, Ohuong Dinh

Boots, shoes, and leggings

364757, 364759, G06F 752

Patent

active

059204974

ABSTRACT:
The present invention relates to a method and apparatus for performing double precision operations using a single type of instruction, wherein a shift bit in a status register is cleared responsive to an operation between signed and signed operands or between unsigned and unsigned operands and the shift bit is cleared responsive to an operation between signed and unsigned operands or unsigned and signed operands. An accumulated result is shifted to the right when the shift bit changes state in order to accomplish a shift and a multiplication to be performed simultaneously responsive to a single type of instruction.

REFERENCES:
patent: 4135249 (1979-01-01), Irwin
patent: 4722068 (1988-01-01), Kuroda et al.
patent: 4809212 (1989-02-01), New et al.
patent: 4811268 (1989-03-01), Nishitani et al.
patent: 5457804 (1995-10-01), Ohtomo
patent: 5463575 (1995-10-01), White

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