XPost: comp.lang.forth   
   From: jj4public@nospicedham.vfemail.net   
      
   On Mon, 09 Mar 2020 14:10:13 GMT, Stephen Pelc wrote:   
   >   
   > In AMD64, the 4x instructions are *all* REX prefices. The 48   
   > instruction is NOT a DEC reg instruction, it's a REX prefix.   
   >   
   > Stephen   
      
   That's interresting. I didn't realize that there are two sets of opcode for   
   `INC/DEC ` instructions in x86: `4x` and `FF Cx`. Is there any article   
   about it? Why there's two set of them? And if one was added later, when was   
   that?   
      
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