JPS6412332A - Decimal arithmetic unit - Google Patents

Decimal arithmetic unit

Info

Publication number
JPS6412332A
JPS6412332A JP62167698A JP16769887A JPS6412332A JP S6412332 A JPS6412332 A JP S6412332A JP 62167698 A JP62167698 A JP 62167698A JP 16769887 A JP16769887 A JP 16769887A JP S6412332 A JPS6412332 A JP S6412332A
Authority
JP
Japan
Prior art keywords
data
decimal
added
stored
register
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62167698A
Other languages
Japanese (ja)
Inventor
Haruo Igarashi
Masaki Mitsui
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP62167698A priority Critical patent/JPS6412332A/en
Publication of JPS6412332A publication Critical patent/JPS6412332A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To eliminate an arithmetic operation for an invalid digit and to improve computing processing speed, by performing a prescribed decimal arithmetic operation only by the number of effective digits for decimal data to be computed and computing decimal data based on effective digit number data. CONSTITUTION:In a memory 10, the effective digit number data of the decimal data is stored with the decimal data. The least significant addresses and the number of digits of those data are designated and read out, and are stored in a register 11 to be added. The same data as the above data for the decimal data to be added in the memory 10 is read out, and is stored in an adding data register 12. A binary addition part 13 adds the data to be added and correction data, and stores it in an intermediate result data register 15. Next, the above data is added on the adding data, and it is stored in an intermediate result data register 16. At this time, the binary addition part 13 executes the binary addition of the number of effective digits.
JP62167698A 1987-07-07 1987-07-07 Decimal arithmetic unit Pending JPS6412332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62167698A JPS6412332A (en) 1987-07-07 1987-07-07 Decimal arithmetic unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62167698A JPS6412332A (en) 1987-07-07 1987-07-07 Decimal arithmetic unit

Publications (1)

Publication Number Publication Date
JPS6412332A true JPS6412332A (en) 1989-01-17

Family

ID=15854562

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62167698A Pending JPS6412332A (en) 1987-07-07 1987-07-07 Decimal arithmetic unit

Country Status (1)

Country Link
JP (1) JPS6412332A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011248890A (en) * 2010-05-28 2011-12-08 International Business Maschines Corporation Detection of decimal floating point quantum exception

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011248890A (en) * 2010-05-28 2011-12-08 International Business Maschines Corporation Detection of decimal floating point quantum exception
US8219605B2 (en) 2010-05-28 2012-07-10 International Business Machines Corporation Decimal floating-pointing quantum exception detection

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