A simple virtual CPU.
A few important opcodes are listed in the table below
| OpCode | Description |
|---|---|
| load1 | Load Register 1 with immediate value |
| load2 | Load Register 2 with immediate value |
| add | Add register 1 and register 2 to register 3 |
| addi1 | Add 1 to register 1 |
| addi2 | Add 1 to register 2 |
| sub | Subtract register 1 from register 2 to register 3 |
| subi1 | Subtract 1 from register 1 |
| subi2 | Subtract 1 from register 2 |
| store0 | Write value of register 1 to memory address 0 |
| store1 | Write value of register 1 to current PC memory address |
| store2 | Write value of register 2 to current PC memory address |
| jump | Unconditional jump to immediate value |
| jumpEqual | Jump if register 1 and register 2 are equal |
| jumpNotEqual | Jump if register 1 and register 2 are not equal |
This sample program runs a loop and prints once the loop is completed.
Memory program;
// Load 15 to register 1
program.write(2, 1);
program.write(3, 15);
// Load 1 to register 2
program.write(4, 2);
program.write(5, 1);
// Loop while register 1 and 2 not are equal
program.write(6, 11);
// Jump to instruction, -> subtract 1 from register 1
program.write(7, 12);
program.write(12, 12);
// Jump back to the start of loop
program.write(13, 7);
program.write(14, 6);
// program.write(9, 7);
// Print once finished the loop
program.write(8, 9);
Memory *p = &program;
CPU cpu(p);
cpu.runCPU();