Repeat instruction
| Machine code |
|---|
| General concepts |
| Instructions |
In computer instruction set architectures (ISA), a repeat instruction is a machine language instruction which repeatedly executes another instruction a fixed number of times, or until some condition is met.
Since it is an instruction that operates on other instructions like the execute instruction, it has been classified as a meta-instruction.[1]
Computer models
One computer family supporting a repeat instruction was the GE-600/Honeywell 6000, which supported a single-instruction repeat (op code mnemonic: RPT), a double-instruction repeat (RPTD), and a linked-list repeat (RPL).[2][3]
Semantics
The instruction to be executed follows the repeat instruction. Fields in the instruction determine the loop termination condition.[3]
Notes
- ^ Rossman, George E. (December 1975). "A Course of Study in Computer Hardware Architecture". IEEE Computer. 8 (12): 44–63. doi:10.1109/C-M.1975.218835., p. 50
- ^ GE-635 System Manual (PDF). General Electric Computer Department. July 1964. p. A-6.
- ^ a b GE-625/635 Programming Reference Manual (PDF). General Electric Information Systems. July 1964.