21. The XCHG Examples

• In array sorting applications, XCHG provides a simple way to exchange two array elements.

• Few more examples using XCHG:

          xchg  ax,  bx  ; exchange 16-bit regs
          xchg  ah,  al  ; exchange 8-bit regs
          xchg  eax, ebx ; exchange 32-bit regs
          xchg  [response], cl  ; exchange 8-bit mem op with CL
          xchg  [total],    edx ; exchange 32-bit mem op with EDX
  

• Without the XCHG instruction, we need a temporary register to exchange values if using only the MOV instruction.