From: ali.lums.pk@gmail.com   
      
   Dear all:   
      
   I have a question: Assume S1 and S2 be two sequence of passes which   
   are not equal, i.e., S1 is different from S2. Let there are two   
   programs P1 and P2. Is it possible that P1 can be compiled   
   successfully using S1 but not with S2. Similarly P2 can be compiled   
   successfully with S2 but not with S1.   
      
   I am getting this when I am changing the sequence of GCC using the   
   SPEC benchmark.   
      
   Thanks for your help.   
   Abid   
      
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