JPS6488634A - Instruction decoder for computer - Google Patents
Instruction decoder for computerInfo
- Publication number
- JPS6488634A JPS6488634A JP24717087A JP24717087A JPS6488634A JP S6488634 A JPS6488634 A JP S6488634A JP 24717087 A JP24717087 A JP 24717087A JP 24717087 A JP24717087 A JP 24717087A JP S6488634 A JPS6488634 A JP S6488634A
- Authority
- JP
- Japan
- Prior art keywords
- address
- decoder
- instruction
- program counter
- counter
- 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)
Abstract
PURPOSE:To releave a programmer from a delayed jump which is the flaw of a pipeline processing which is essential for high-speed processing by adding a program counter and a decoder which is paired with the former. CONSTITUTION:The program counter 15 which a t all time represents the effective address of one instruction destination as well as the decoder 16 which is paired with the counter 15 is provided. Since the counter 15 always designates an address preceeding by one designated by a program counter 11, the decoder 16 decodes and executes an instruction always preceeding by one operational cycle. When the content in the address N of an instruction storing memory 12 is decoded as 'CALL M' in the decoder 16, an M is inputted to the program counter 11 in the succeeding execution cycle, and at the same time, a value N+1 is stored in a stack 14. Accordingly, the execution of an instruction in the address M can be enable in the cycle following the execution cycle for the address N. As a result, a delayed jump that is the flaw of pipeline processing can be prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24717087A JPS6488634A (en) | 1987-09-29 | 1987-09-29 | Instruction decoder for computer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24717087A JPS6488634A (en) | 1987-09-29 | 1987-09-29 | Instruction decoder for computer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6488634A true JPS6488634A (en) | 1989-04-03 |
Family
ID=17159482
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24717087A Pending JPS6488634A (en) | 1987-09-29 | 1987-09-29 | Instruction decoder for computer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6488634A (en) |
-
1987
- 1987-09-29 JP JP24717087A patent/JPS6488634A/en active Pending
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