From: bc@nospicedham.freeuk.com   
      
   On 27/08/2017 07:38, R.Wieser wrote:   
   > firr,   
   >   
   >> do it really works?   
   >   
   > Yes, they do,*   
   >   
   > I hope you do realize that although the first group (roughly) translates to   
   > NOPs**, the second group actually changes the contents of the register.   
   >   
   > *they might have been re-purposed in later processor versions though.   
   >   
   > **while the involved register does not change, there might be some effect on   
   > the rest of the processor.   
      
   On x64, moving a 32-bit register to itself clears the top half of of the   
   corresponding 64-bit register (so mov eax,eax clears the top half of   
   rax). I think anything that modifies a 32-bit register does the same.   
      
   --   
   bartc   
      
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