Show the simple arithmetic application, Computer Engineering

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Q. Show the Simple Arithmetic Application?

The question is why can't we simply employ XCHG instruction with 2 memory variables as operand? To answer the question let's look into a number of constraints for XCHG &MOV instructions:

MOV instruction has subsequent operands and constraints:

  • IP and CS may never be destination operands in MOV
  • Immediate memory variables and data value may not be moved to segment registers
  • Source and destination operands must be of the same size
  • Both operands can't be memory locations
  • If source is immediate data it should not exceed 255 (FFh) for an 8-bit destination or 65,535 (FFFFh) for a 16-bit destination.

Statement MOV AL, VALUE1 copies the VALUE1 which is 0Ah in AL register:

2498_Show the Simple Arithmetic Application.png

Instruction XCHG   AL, VALUE2 exchanges the value of AL with VALUE2

Now AL and VALUE2 contains and values as under:

2008_Show the Simple Arithmetic Application.png

StatementMOV VALUE1, AL; now puts value of AL to VALUE1. 

So desired exchange is complete 

1733_Show the Simple Arithmetic Application1.png

Simple Arithmetic Application


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