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docs/cpu.md: Add comment about operand order

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jn 2023-02-02 03:12:12 +01:00
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@ -55,6 +55,16 @@ by a source operand, or by source and target operands, depending on the opcode.
| 15:14 | size | operation size, e.g. 32 bits
NOTE: Although in the instruction encoding the source operand comes first,
followed by the target operand, the order is reversed in the fox32 assembly
language. The following lines are equivalent:
```
cmp r1, r20
data.16 0x8700 data.8 20 data.8 1
```
### Operand types
| value | description | size of operand | what's actually stored?