For what m2m

[KoDeR]

I can't understand for what this MACRO  ::)
   
m2m MACRO M1, M2
      push M2
      pop  M1
   ENDM

[mnemonic]

The m2m macro simply copies (moves) a value from one [m]emory location to [2] a different [m]emory location using the stack.
You can't do a mov mem, mem but you can simulate it via the m2m macro: m2m mem, mem. But be aware of the fact that you are effectively using the stack.

[pbrennick]

KoDeR,
Just to add to mnemonic's excellent reply; the stack is a very efficient way of transporting values between memory locations due to the fact that since there are a limitted number of registers it would not be a good idea to waste any.  It is a very efficient macro.

Paul

[KoDeR]

Thank you mnemonic
it was very good answer  :thumbu