JPS6486237A - Apparatus and method for accelerating effective subtraction procedure of floating point by estimation of absolute value of difference in threshold of exponential part - Google Patents
Apparatus and method for accelerating effective subtraction procedure of floating point by estimation of absolute value of difference in threshold of exponential partInfo
- Publication number
- JPS6486237A JPS6486237A JP63152088A JP15208888A JPS6486237A JP S6486237 A JPS6486237 A JP S6486237A JP 63152088 A JP63152088 A JP 63152088A JP 15208888 A JP15208888 A JP 15208888A JP S6486237 A JPS6486237 A JP S6486237A
- Authority
- JP
- Japan
- Prior art keywords
- difference
- operand
- exponential part
- estimation
- threshold
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
- G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
- G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
- G06F7/483—Computations with numbers represented by a non-linear combination of denominational numbers, e.g. rational numbers, logarithmic number system or floating-point numbers
- G06F7/485—Adding; Subtracting
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2207/00—Indexing scheme relating to methods or arrangements for processing data by operating upon the order or content of the data handled
- G06F2207/544—Indexing scheme relating to group G06F7/544
- G06F2207/5442—Absolute difference
Landscapes
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Mathematical Optimization (AREA)
- Computing Systems (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Nonlinear Science (AREA)
- General Engineering & Computer Science (AREA)
- Executing Machine-Instructions (AREA)
- Complex Calculations (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/064,835 US4858165A (en) | 1987-06-19 | 1987-06-19 | Apparatus and method for acceleration of effective subtraction procedures by the approximation of the absolute value of the exponent argument difference |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6486237A true JPS6486237A (en) | 1989-03-30 |
JPH0545980B2 JPH0545980B2 (ja) | 1993-07-12 |
Family
ID=22058542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63152088A Granted JPS6486237A (en) | 1987-06-19 | 1988-06-20 | Apparatus and method for accelerating effective subtraction procedure of floating point by estimation of absolute value of difference in threshold of exponential part |
Country Status (8)
Country | Link |
---|---|
US (1) | US4858165A (ja) |
EP (1) | EP0296071B1 (ja) |
JP (1) | JPS6486237A (ja) |
KR (1) | KR940002268B1 (ja) |
AU (2) | AU1813988A (ja) |
CA (1) | CA1294055C (ja) |
DE (1) | DE3852217T2 (ja) |
IL (1) | IL86793A (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0776911B2 (ja) * | 1988-03-23 | 1995-08-16 | 松下電器産業株式会社 | 浮動小数点演算装置 |
US4994996A (en) * | 1989-02-03 | 1991-02-19 | Digital Equipment Corporation | Pipelined floating point adder for digital computer |
US5432727A (en) * | 1989-11-02 | 1995-07-11 | Intergraph Corporation | Apparatus for computing a sticky bit for a floating point arithmetic unit |
JPH0748176B2 (ja) * | 1990-01-24 | 1995-05-24 | インターナショナル・ビジネス・マシーンズ・コーポレイション | 浮動小数点算術演算方法及び装置 |
US5117384A (en) * | 1990-01-24 | 1992-05-26 | International Business Machines Corporation | Method and apparatus for exponent adder |
DE69130627T2 (de) * | 1990-09-07 | 1999-09-09 | Nec Corp | Schaltung zur Bestimmung des Betrags der Verschiebung in einen Gleitkommarechner, welche nur wenig Hardware braucht und mit hoher Geschwindigkeit zu betreiben ist |
US5247471A (en) * | 1991-12-13 | 1993-09-21 | International Business Machines Corporation | Radix aligner for floating point addition and subtraction |
US5742533A (en) * | 1996-05-21 | 1998-04-21 | International Business Machines Corporation | Method and apparatus for modulus error checking |
US6226271B1 (en) | 1997-09-26 | 2001-05-01 | Ericsson Inc. | Received signal strength determination method, apparatus and computer program products |
US5944774A (en) * | 1997-09-26 | 1999-08-31 | Ericsson Inc. | Methods apparatus and computer program products for accumulating logarithmic values |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS595346A (ja) * | 1982-06-30 | 1984-01-12 | Fujitsu Ltd | 演算制御方式 |
JPS59226944A (ja) * | 1983-06-09 | 1984-12-20 | Fujitsu Ltd | 浮動小数点デ−タ加減算方式 |
JPS61177538A (ja) * | 1985-01-29 | 1986-08-09 | エイ・テイ・アンド・ティ・コーポレーション | 最上位の数字の位置の検出 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59188740A (ja) * | 1983-04-11 | 1984-10-26 | Hitachi Ltd | フロ−テイング加算器 |
CA1229415A (en) * | 1983-12-09 | 1987-11-17 | Masayuki Ikeda | Floating-point addition/subtraction system |
US4639887A (en) * | 1984-02-24 | 1987-01-27 | The United States Of America As Represented By The United States Department Of Energy | Bifurcated method and apparatus for floating point addition with decreased latency time |
-
1987
- 1987-06-19 US US07/064,835 patent/US4858165A/en not_active Expired - Lifetime
-
1988
- 1988-06-17 CA CA000569707A patent/CA1294055C/en not_active Expired - Fee Related
- 1988-06-19 IL IL86793A patent/IL86793A/xx unknown
- 1988-06-20 DE DE3852217T patent/DE3852217T2/de not_active Expired - Lifetime
- 1988-06-20 AU AU18139/88A patent/AU1813988A/en not_active Abandoned
- 1988-06-20 JP JP63152088A patent/JPS6486237A/ja active Granted
- 1988-06-20 EP EP88401539A patent/EP0296071B1/en not_active Expired - Lifetime
- 1988-06-20 KR KR1019880007418A patent/KR940002268B1/ko active IP Right Grant
-
1991
- 1991-11-22 AU AU88098/91A patent/AU8809891A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS595346A (ja) * | 1982-06-30 | 1984-01-12 | Fujitsu Ltd | 演算制御方式 |
JPS59226944A (ja) * | 1983-06-09 | 1984-12-20 | Fujitsu Ltd | 浮動小数点デ−タ加減算方式 |
JPS61177538A (ja) * | 1985-01-29 | 1986-08-09 | エイ・テイ・アンド・ティ・コーポレーション | 最上位の数字の位置の検出 |
Also Published As
Publication number | Publication date |
---|---|
US4858165A (en) | 1989-08-15 |
AU8809891A (en) | 1992-01-23 |
IL86793A (en) | 1991-06-10 |
JPH0545980B2 (ja) | 1993-07-12 |
EP0296071A2 (en) | 1988-12-21 |
DE3852217D1 (de) | 1995-01-12 |
EP0296071A3 (en) | 1991-01-30 |
DE3852217T2 (de) | 1995-06-08 |
AU1813988A (en) | 1988-12-22 |
KR890000967A (ko) | 1989-03-17 |
IL86793A0 (en) | 1988-11-30 |
EP0296071B1 (en) | 1994-11-30 |
KR940002268B1 (ko) | 1994-03-19 |
CA1294055C (en) | 1992-01-07 |
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Legal Events
Date | Code | Title | Description |
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FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080712 Year of fee payment: 15 |
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EXPY | Cancellation because of completion of term |