JPS6448125A - Normalization requesting circuit for floating-point arithmetic operation - Google Patents
Normalization requesting circuit for floating-point arithmetic operationInfo
- Publication number
- JPS6448125A JPS6448125A JP62205485A JP20548587A JPS6448125A JP S6448125 A JPS6448125 A JP S6448125A JP 62205485 A JP62205485 A JP 62205485A JP 20548587 A JP20548587 A JP 20548587A JP S6448125 A JPS6448125 A JP S6448125A
- Authority
- JP
- Japan
- Prior art keywords
- normalization
- borrow
- arithmetic
- normalizing
- floating
- 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
Links
Abstract
PURPOSE:To prevent determination of a ratio of normalizing operation to the number of times of arithmetic from causing the degradation in precision due to borrow and trade-off of the processing time by performing normalization at the time of the occurrence of borrow. CONSTITUTION:A mantissa part ALU 1, a register 2 where the arithmetic result is stored, and a shifter 3 for normalization are provided, and a borrow detecting circuit 4 detects borrow of four bits from the MSB wit respect to the arithmetic result obtained by floating-point arithmetic. If borrow of four or more bits is detected, the result is stored in a normalization request flag circuit 6. When detecting this normalization request flag, an ALU control circuit 5 generates a normalizing instruction by the interrupt operation and stores the normalized result in the register 2 and returns from interruption. Thus, the normalizing operation to be inserted to a series of repeatedly performed non-normalizing arithmetic operation is most suitably set.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62205485A JPS6448125A (en) | 1987-08-18 | 1987-08-18 | Normalization requesting circuit for floating-point arithmetic operation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62205485A JPS6448125A (en) | 1987-08-18 | 1987-08-18 | Normalization requesting circuit for floating-point arithmetic operation |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6448125A true JPS6448125A (en) | 1989-02-22 |
Family
ID=16507633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62205485A Pending JPS6448125A (en) | 1987-08-18 | 1987-08-18 | Normalization requesting circuit for floating-point arithmetic operation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6448125A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH025125A (en) * | 1988-06-24 | 1990-01-10 | Matsushita Electric Ind Co Ltd | Normalizing circuit |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5690343A (en) * | 1979-12-25 | 1981-07-22 | Fujitsu Ltd | Data normalization device |
JPS6017534A (en) * | 1983-07-08 | 1985-01-29 | Mitsubishi Electric Corp | Floating-point numeral normalized circuit |
JPS61270142A (en) * | 1985-05-25 | 1986-11-29 | 福友産業株式会社 | Method and device for making triangular bag |
-
1987
- 1987-08-18 JP JP62205485A patent/JPS6448125A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5690343A (en) * | 1979-12-25 | 1981-07-22 | Fujitsu Ltd | Data normalization device |
JPS6017534A (en) * | 1983-07-08 | 1985-01-29 | Mitsubishi Electric Corp | Floating-point numeral normalized circuit |
JPS61270142A (en) * | 1985-05-25 | 1986-11-29 | 福友産業株式会社 | Method and device for making triangular bag |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH025125A (en) * | 1988-06-24 | 1990-01-10 | Matsushita Electric Ind Co Ltd | Normalizing circuit |
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