From: kamalpr@gmail.com   
      
   On Apr 13, 10:58 pm, andreybokha...@gmail.com wrote:   
   > I believe the primary reason why superblocks exist on machine-specific   
   > IRs is because they used by machine-specific optimizations (primarly   
   > by scheduling).   
   >   
   > Profiling, however, can be (and actually does) used by machine-   
   > independent (well... actually, less clearly machine-dependent)   
   > optimizations, working on machine-independent IRs. Examples are loop   
   > optimizations (unrolling, prefetch, etc) and PRE.   
      
   also, look at HP's profile based optimizations. You can get that by   
   using +O4 on HP's compilers.   
      
   regards   
   -kamal   
      
   > Andrey   
      
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