> Can I generate SSA immediately from the AST?   
      
   SSA is used to further refine the IR you choose.  3-address code is   
   the minimum to implement SSA. So, yes you may need to do both.  You   
   will also need to distinguish between the representation of the   
   IR. Both tree and record(DAG) formats can support 3-address codes.   
      
   The fastest way to get to SSA would be what GCC does i.e. convert the   
   AST to 3-address tree code and then insert the phi nodes to get a   
   tree-SSA implementation.   
      
   Sincerely,   
   Partha Sarathi Panda   
      
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