JPS54100635A - Information processor - Google Patents
Information processorInfo
- Publication number
- JPS54100635A JPS54100635A JP770178A JP770178A JPS54100635A JP S54100635 A JPS54100635 A JP S54100635A JP 770178 A JP770178 A JP 770178A JP 770178 A JP770178 A JP 770178A JP S54100635 A JPS54100635 A JP S54100635A
- Authority
- JP
- Japan
- Prior art keywords
- instruction
- branch
- circuit
- register
- memory unit
- 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
Landscapes
- Advance Control (AREA)
- Executing Machine-Instructions (AREA)
Abstract
PURPOSE: To obtain an efficient leading control function with unneeded requests suppressed with respect to the leading process of a branch instruction, by enabling a memory unit to function to extract the instruction under specific conditions without sending out an instruction read request.
CONSTITUTION: The figure shows the look-ahead circuit. Instruction look-ahead control circuit 16 exercises a supervision over the idle state of register 11, fetches an instruction from a main memory unit not shown in the figure, and updates the contents of register 11. Now, a branch instruction is decoded by a processing part not shown in the figure and an computed branch-destination address is inputted to comparator circuit 17, so that the above-mentioned update operation will stop. On the basis of the contents of upper-limit and lower-limit address registers 13 and 14, comparator circuit 17 detects whether or not the branch-destination address is included in register 11. Judging from this result, circuit 16 determines whether or not the branch instruction should be read out from the main memory unit.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP770178A JPS54100635A (en) | 1978-01-25 | 1978-01-25 | Information processor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP770178A JPS54100635A (en) | 1978-01-25 | 1978-01-25 | Information processor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54100635A true JPS54100635A (en) | 1979-08-08 |
Family
ID=11673054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP770178A Pending JPS54100635A (en) | 1978-01-25 | 1978-01-25 | Information processor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54100635A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58159154A (en) * | 1982-03-18 | 1983-09-21 | Yokogawa Hokushin Electric Corp | Instruction loop catching mechanism for data processor |
JPS59165144A (en) * | 1983-03-07 | 1984-09-18 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Order extractor |
JPS61256446A (en) * | 1985-04-30 | 1986-11-14 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Instruction fetch buffer control |
JPS626328A (en) * | 1985-07-03 | 1987-01-13 | Hitachi Ltd | Information processor |
JPH01239639A (en) * | 1988-01-25 | 1989-09-25 | Otto Muller | Circuit apparatus and control for instruction buffer memory in data processor |
-
1978
- 1978-01-25 JP JP770178A patent/JPS54100635A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58159154A (en) * | 1982-03-18 | 1983-09-21 | Yokogawa Hokushin Electric Corp | Instruction loop catching mechanism for data processor |
JPS59165144A (en) * | 1983-03-07 | 1984-09-18 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Order extractor |
JPS61256446A (en) * | 1985-04-30 | 1986-11-14 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Instruction fetch buffer control |
JPS626328A (en) * | 1985-07-03 | 1987-01-13 | Hitachi Ltd | Information processor |
JPH01239639A (en) * | 1988-01-25 | 1989-09-25 | Otto Muller | Circuit apparatus and control for instruction buffer memory in data processor |
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