From: rose@acm.org   
      
   cyril.cressent@gmail.com wrote:   
      
   > I was wondering if there are some general guidelines one should   
   > observe when designing an instruction set so that a C compiler can   
   > easily be ported to that CPU.   
      
   > [Interesting question.  C should be pretty straightforward on anything   
   > with flat byte addressing and enough registers to handle stack frames.   
   > What makes this architecture hard? -John]   
      
   I don't know anything about the poster's instruction set, but from my   
   own experience, it's a pain to have to have a scratch register to spill,   
   which makes a register+offset or register+register addressing mode very   
   handy.   
      
   Be careful that the instruction set supports all the branches that C   
   calls for.  For instance, one machine I've worked on doesn't have an   
   overflow flag, which makes signed comparisons awkward.   
      
     - ken   
      
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