Control flow instructions

Control flow instructions in the virtual processor's assembly language guide the program's execution flow.

Instruction	Syntax	Binary Code	Usage	Error Check
goto	goto label1	0000 1000 0101 0110 (Op code: 0 0001)	Unconditionally jumps to the specified label.	Confirm label existence.
call	call label1	0001 0000 0101 0110 (Op code: 00010)	Calls a subroutine at label1.	Verify label existence.
ret	ret	1011 0000 0000 0000 (Op code: 1 0110)	Returns from a subroutine.	Use only after a call instruction.

Examples

1. Using goto:

   ; Assume 'mainLoop' is a label defined elsewhere in the code
   mainLoop:
       ; Some code here
       ; ...
   
   ; Jumping to 'mainLoop'
   goto mainLoop   ; Control of the program jumps to the 'mainLoop' label

2. Calling a subroutine:

   ; Defining a subroutine
   computeValue:
       ; Code for the subroutine
       ret  ; Returns to the calling location
   
   ; In the main program
   call computeValue  ; Calls the subroutine 'computeValue'
   ; Execution continues here after the subroutine finishes

3. Returning from a subroutine:

   ; Subroutine definition
   computeValue:
       ; Code for the subroutine
       ret  ; Returns control to the instruction after the 'call computeValue'
   
   ; In the main program
   call computeValue  ; Calls 'computeValue'
   ; Execution resumes here after 'computeValue' completes