29. CMP instruction

• Format:

      cmp  destination, source
  

• Semantics:

      (destination) - (source)
  

• The destination and source are not altered.

• Useful to test relationship such as < > or = between the two operands.

• Used in conjunction with conditional jump instructions for decision making purposes.

• Examples:

          cmp ebx, eax
          je  done      ; jump if equal
          ..
      done:
          ..