;data 
a dd 1
b dd 2
c dd 10
;from one place code
mcg.start = [a]
mcg.loop = [b]
mcg.end = [c]

mcg ;do some

;second place in code
mcg.start = [b]
mcg.loop = [c]
mcg.end = [a]

mcg ;do some

    

macro mcg.Init { local a
      jmp a
      mcg.start dd 0
      mcg.end   dd 0
      mcg.loop  dd 0
a:
      }
macro mcg.Put a,b {
      movd xmm0,b
      movd [mcg.#a],xmm0
      }
macro mcg.Run {local .a
      mov eax,[mcg.start]
      mov ebx,[mcg.loop]
      mov ecx,[mcg.end]
      invoke MessageBox,0,'mcg.Run',0,0
.a:
      }   

;in code
                mcg.Init  ;do once or not write this.
                mcg.Put start,[cerr]  ;if this and mcg.start not defined then define mcg.start
                mcg.Put end,[cerr]
                mcg.Put loop,eax
                mcg.Run 
    

macro mcg.Put a,b {
    if ~ defined mcg.#a

    jmp @f
    mcg.#a dd 0
  @@:
    end if
      movd xmm0,b
      movd [mcg.#a],xmm0
      } 
    

macro mcg.Put a,b {
        if ~ defined mcg.#a | defined @f
jmp @f
  mcg#.a dd 0
@@:
  movd xmm0,b
  movd [mcg.#a],xmm0
        }    

macro mcg.Put_ a,b {
        if ~ defined mcg.#a | defined @f
jmp @f
  mcg.#a dd 0
@@:
end if
  movd xmm0,b
  movd [mcg.#a],xmm0
        } 
    

macro mcg.Put_ a,b
{  ..dataonce mcg.#a, mcg.#a   dd 0
      movd   xmm0,b
      movd   [mcg.#a],xmm0 }