On Mon, 10 Aug 2020 20:24:51 +0200, Bonita Montero   
    wrote:   
   ...   
   >   
   >But why has AVX this three-parameter-versions and the destination   
   >parameter where the double is written to is the first parameter,   
   >i.e. the second is ignored ?   
   >   
   You can better see the value of the three-parameter versions in an   
   instruction like:   
      
   VADDSD xmm1,xmm2,xmm3   
      
   That adds xmm2 and xmm3 and puts the result into xmm1, but doesn't   
   change xmm2 (which is the point).   
      
   so instead of:   
      
   movsd xmm1,xmm2   
   addsd xmm1,xmm3   
      
   you can do it with just one instruction.   
   --   
   aen   
      
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