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Index > Macroinstructions > Is it possible to overload an ASM instruction with macro?

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alorent



Joined: 05 Dec 2005
Posts: 201
alorent
Hello,

Is it possible for example to overload the "MOV" instruction with a macro to accept something like the following:

Code:
mov  [var_1], [var_2]    


which internally it could generate something like:

Code:
mov   eax, [var_2]
mov   [var_1], eax    


I was just wondering.... Smile

Thanks!
Post 14 Nov 2010, 12:46
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7783
Location: Kraków, Poland
Tomasz Grysztar
Have you checked the fasm's manual? It contains this example:
Code:
    macro mov op1,op2
     {
      if op1 in <ds,es,fs,gs,ss> & op2 in <cs,ds,es,fs,gs,ss>
        push  op2
        pop   op1
      else
        mov   op1,op2
      end if
     }    
It can be easily modified into something with memory-to-memory capability, like:
Code:
    macro mov op1,op2
     {
      if op1 eqtype [var] & op2 eqtype [var]
        push  op2
        pop   op1
      else
        mov   op1,op2
      end if
     }    


Just note that macroinstructions are case-sensitive, while instructions are not. So when you redefine "mov" as macro, "MOV" is still going to be just regular instruction.
Post 14 Nov 2010, 13:17
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alorent



Joined: 05 Dec 2005
Posts: 201
alorent
Thanks a lot Tomasz!!!
Post 14 Nov 2010, 22:35
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