From: marcov@stack.nl   
      
   On 2007-10-01, John L  wrote:   
   > To preferentially assign a virtual register to a specific machine   
   > register, rewrite the instruction to use the real register, and   
   > prepend a copy virtual -> real / append a copy real -> virtual. If the   
   > virtual register can safely be assigned to that real register, the   
   > coalescing phase will do this and eliminate the copy. This works for   
   > call parameters, call results, and ops that only take a specific   
   > register.   
      
   How do you specify an affinity that is not 100% necessary? Like older i386   
   arch CPU's having a preference for EBX as index register ?   
      
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