From: jeffrey.kenton@comcast.net   
      
   shafi wrote:   
   > I am involved with the porting of GCC for a new arm processor.   
   > The trouble is that I have to add a feature which is not supported by   
   > GCC - Fixed point support.   
      
   You need to separate several issues:   
      
   1. internal number format/precision and run-time support.  You have to   
   design and implement this no matter what other choices you make.  Do it   
   first.  It's not that hard, although division isn't 100% intuitive --   
   see Knuth or various other sources for details (Google is your friend   
   here, along with comp.arch.arithmetic).   
      
   2. compiler support for fixed point constants.  also simple.   
      
   3. compiler support for fixed point expressions, casting and rules for   
   mixing of types.   
      
   4. fixed point I/O -- what do you want printf() to do?   
      
   Have fun.   
      
   jeff   
      
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