Adding two Integer values in DLX

Adding two Integers from two Registers Example code:

1:  Add r1,r2,r3 ;r1=r2+r3  

Explanation of code:

1:  #r1 register=0  
2:  #r2 register=1  
3:  #r3 register=2  
4:  //before execution  
5:  Add r1,r2,r3 ;r1=r2+r3  
6:  //after execution  
7:  #r1 register=3  
8:  #r2 register=1  
9:  #r3 register=2  

Adding a register with immediate value Example code

1:  addi r1,r2,100  

Explanation of code

1:  #r1 register=0  
2:  #r2 register=1  
3:  //before execution  
4:  addi r1,r2,100  
5:  //after execution  
6:  #r1 register=101  
7:  #r2 register=1  

Addition Commands on DLX

1:  add r1,r2,r3   ;Adding Signed integers  
2:  addi r1,r2,100 ;Adding Signed integers Immediate  
3:  addu r1,r2,r3   ;Adding Unsigned integers  
4:  addui r1,r2,100 ;Adding Unsigned integers Immediate