From: user5857@newsgrouper.org.invalid   
      
   Terje Mathisen  posted:   
      
   > MitchAlsup wrote:   
   > > When I looked deeply into the situation, it was easier in HW to do::   
   > >   
   > >       for( i = 0; i < 8; i++ )   
   > >            out[field[i]] = in[i]   
   > >   
   > > than::   
   > >       for( i = 0; i < 8; i++ )   
   > >            out[i] = in[field[i]]   
   > >   
   >   
   > That isn't really that surprising:   
   >   
   > This way the inputs are available early and in sequential order, while   
   > the stores can be allowed to have higher latency, right?   
   >   
   > > For some reason we called this swizzle not permute !?!   
   >   
   > I'm assuming collisions would be disallowed? I.e. you can use it to   
   > splat a single input into all output slots, but you cannot target   
   > multiple inputs toward the same destination.   
      
   The later is why the HW logic is significantly easier.   
   >   
   > Terje   
   >   
      
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