Question

Write an assembly language code for the following pseudo code

i. if(op1 == op2)

x=1;

else x=2;

using x86 assembly language

Answer 1

Solution:

MOV AX,op1
MOV BX,op2
IF: CMP AX,BX
   JE TAG
   JNE ELSE
  
ELSE:
MOV CX,#2
   MOV X,CX
   JMP ENFIF
  
TAG:
   MOV CX,#1
   MOV X,CX
   JMP ENFIF
  
ENDIF:

Explanation:

Initially we move op1 and op2 to AX and BX registers.

Now we check the if condition, compare AX and BX.

JE - Jump if equal

JNE - Jump if not equal.

If AX and BX are equal, TAG label statements gets executed.

Else the Else label statements gets executed.

TAG:

We move value 1 to CX register and then to location X

ELSE:

We move value 2 to CX register and then to location X