From: nowhere@nospicedham.never.at   
      
   On 15.02.2019 18:25, src153 wrote:   
   > I have a disassembly where   
   >   
   >      FF C0 --> inc ax   
   >   
   > but when I reassemble the source I get   
   >   
   >      inc ax --> 40   
   >   
   > Is there a reason to prefer the two byte translation? Can MASM 5.1 do   
   > that, without forcing DB in the middle of code?   
      
   the '40' become a REX-prefix within 64-bit long-mode, so the two byte   
   variant is the only choice, while 16 and 32-bit modes can use single   
   byte inc/dec.   
   __   
   wolfgang   
      
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