From: shafitvm@gmail.com   
      
   Hello all,   
      
   I am trying to implement Briggs Optimistic register allocator after   
   reading the the thesis written by Preston Briggs.   
      
   Now for building the interference graph what other than register pairs   
   is there any other issues that one has to look out for?   
      
   Regards,   
   Shafi   
      
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