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zk/Machine code.md
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@ -9,3 +9,23 @@ created: Monday, March 11, 2024
No matter how a program was originally written, it eventually needs to execute No matter how a program was originally written, it eventually needs to execute
on a [[CPU_architecture|CPU]] as a series of machine language instructions. on a [[CPU_architecture|CPU]] as a series of machine language instructions.
## Example machine instruction
The following machine instruction is an instruction that would be understood by
an [[Instruction_set_architectures| ARM ISA]]. It moves the number `4` into the
`r7` register:
```
11100011101000000111000000000100
```
This 32bit line of binary has a series of instructions embedded within it. We
partition each part of the sequence below, from left to right, mapping it to the
instruction:
| Binary sequence | Instruction | Action |
| --------------- | ----------- | ------ |
| 1110 | | |
| 00 | | |
| 1101 | | |