US Patent No: 4,677,582

Number of patents in Portfolio can not be more than 2000

Operation processing apparatus

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Abstract

An operation processing apparatus executes an instruction accompanied by addition/subtraction for one word and halfword operands at a high speed. An expander expands the sign of a second operand in its upper halfword bits to produce an expanded second operand having the same length as that of a first operand. An arithmetic unit operates the first operand and the expanded second operand.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO32320

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nagafuji, Motonobu Hadano, JP 4 95

Cited Art

Patent Info (Count) # Cites Year
 
DATA GENERAL CORPORATION (1)
4,434,459 Data processing system having instruction responsive apparatus for both a basic and an extended instruction set 37 1980
 
MICRON TECHNOLOGY, INC. (1)
4,507,731 Bidirectional data byte aligner 40 1982
 
MOTOROLA, INC. (1)
4,296,469 Execution unit for data processor using segmented bus structure 37 1978
 
TEXAS INSTRUMENTS INCORPORATED (1)
4,491,910 Microcomputer having data shift within memory 34 1982

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
INTEL CORPORATION (10)
6,970,994 Executing partial-width packed data instructions 4 2001
7,424,505 Method and apparatus for performing multiply-add operations on packed data 0 2001
7,430,578 Method and apparatus for performing multiply-add operations on packed byte data 16 2003
7,395,298 Method and apparatus for performing multiply-add operations on packed data 17 2003
6,925,553 Staggering execution of a single packed data instruction using the same circuit 2 2003
7,509,367 Method and apparatus for performing multiply-add operations on packed data 0 2004
7,366,881 Method and apparatus for staggering execution of an instruction 0 2005
7,467,286 Executing partial-width packed data instructions 0 2005
8,185,571 Processor for performing multiply-add operations on packed data 0 2009
8,396,915 Processor for performing multiply-add operations on packed data 0 2012
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
5,440,504 Arithmetic apparatus for digital signal processor 13 1994
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
5,307,474 Apparatus and method for processing literal operand computer instructions 1 1992
 
RPX CORPORATION (1)
4,809,166 Data assembly apparatus and method 11 1986
 
UNISYS CORPORATION (1)
5,101,370 Programmable digital accumulate and scale circuit 6 1990